CN109542085B - Automatic experiment platform flexible switching device with time-lag configuration function and method - Google Patents

Abstract

The invention proposes a flexible switching device and method for an automated experimental platform with a time-delay configuration function, including: a control system side I/O board, a controlled object side I/O board and a switching computer system; the invention is used in different control systems. With a controlled object, a set of flexible switching device is established, without changing the hard-wired connection, only by switching the operation of the flexible switching software in the computer system to achieve flexible switching between different control systems, and in the same control system. In the system, the same type of boards can also be flexibly switched between different channels, and the time delay size of the controlled object can be arbitrarily configured to obtain a generalized controlled object with any time delay size, making the industrial process Controlled research experiments and teaching experiments can be successfully completed without the need to replace the control system and reconnect each time, which saves a lot of experimental time and is very necessary.

Description

Flexible switching device and method for automated experimental platform with time delay configuration function

technical field

The invention belongs to the research, experiment and teaching fields of industrial automation and process control technology, and particularly relates to a flexible switching device and method for an automated experimental platform with a time-delay configuration function.

Background technique

Industrial automation and process control are disciplines with strong practicality oriented to actual industrial processes. In order to meet the research, experiment and teaching needs of industrial automation and process control technology, it is necessary to establish a laboratory environment that is highly consistent with the field industrial environment. Industrial process automation experimental platform. The industrial process automation experimental platform is mainly composed of the controlled object and the control system, wherein the controlled object includes: the controlled process, the detection instrument and the actuator. At present, in the industrial field, the mainstream control system is generally PLC control system, that is, programmable logic controller, or DCS control system, that is, distributed computer control system. The detection instruments are generally flow, temperature, pressure, material level and concentration, etc. Instruments and actuators are generally frequency converters, regulating valves, etc. The way of data transmission between the control system and the controlled object is generally through the switch input DI board, switch output DO board, analog input AI board, analog output AO board and the controlled object of the control system. The detection instruments and actuators are directly connected to communicate through cables, and this connection method is called hard-wire connection. In order to be consistent with the industrial field, most of the industrial process automation experimental devices in the laboratory are also connected in this way. Industrial process control experimental device and method ZL201610362760.6, this connection method is adopted between the controlled object and the control system in the experimental device described in these two articles.

In the laboratory environment, the experimenter may need to perform automated experiments of the same type or the same algorithm on different control systems, which leads to the problem of how multiple control systems control the same controlled object. If you need to rewire between different control systems, actuators, and detection instruments every time you do an experiment, it will inevitably increase the time of the experiment, the risk of the equipment and the risk of the experiment, and greatly increase the maintenance cost, which is obviously not feasible. of.

On the other hand, time-delay characteristics generally exist in industrial production processes. Typical production processes include but are not limited to pipeline transportation processes, belt conveying processes, and many thermal processes. Many control schemes are proposed for the time-delay problem of the controlled object. Therefore, in this type of control algorithm experiment, such as Smith prediction control, minimum variance control, generalized minimum variance control, feedforward control, zero-pole configuration control, self-calibration control, etc., the controlled object of the experimental platform is required. It should be able to simulate the corresponding characteristics such as large time delay, variable time delay, and unknown time delay.

SUMMARY OF THE INVENTION

In view of the above problems, a flexible switching device and method for an automated experimental platform with time-delay configuration function are developed, so that the detection instruments and actuators corresponding to different control systems and the same controlled object only need to be connected to the switching device at the same time. It is very necessary to realize the flexible switching between control systems conveniently and flexibly, and at the same time, the time delay of the controlled object can be flexibly generated and configured, so that the research experiments and teaching experiments of industrial process automation can be successfully completed.

Aiming at the difficulty in the laboratory environment that it is difficult to flexibly and conveniently solve the problem that the control system specified in the hard-wired connection needs to be rewired to control the controlled object and the simple controlled object is difficult to meet the time delay unknown and time-varying requirements. A flexible switching device and method for an automated experimental platform with a time-delay configuration function.

The flexible switching device of the automation experiment platform with the function of time-delay configuration includes: the control system side I/O board, the controlled object side I/O board and the switching computer system;

The n sets of control systems in the automation experiment platform with time-delay configuration function are connected with the flexible switching device through the I/O board on the control system side, and the flexible switching device is connected with the controlled object through the I/O board on the controlled object side;

Among the n sets of control systems, each control system contains 4 kinds of I/O boards, including: switch output DO board, analog output AO board, switch input DI board and analog input AI board;

The controlled object includes: the controlled process, the executive mechanism and the detection instrument;

The flexible switching device and the controlled object form a generalized controlled object;

The I/O boards on the control system side of the flexible switching device are divided into n groups, and each group contains 4 kinds of I/O boards, including: switch output DO boards, analog output AO boards, and switch input DI Boards and analog input AI boards, each control system corresponds to a group of I/O boards on the control system side of the flexible switching device;

The I/O board on the controlled object side of the flexible switching device includes 4 kinds of I/O boards, including: switch output DO board, analog output AO board, switch input DI board and analog input AI board;

The number of channels of digital output DO boards in each control system, the number of channels of each group of digital input DI boards on the control system side of the flexible switching device, and the channels of the digital output DO boards on the controlled object side of the flexible switching device The number is equal and not less than the number of DO signals required by the controlled object;

The number of channels of analog output AO boards in each control system, the number of channels of each group of analog input AI boards on the control system side of the flexible switching device, and the channels of the analog output AO boards on the controlled object side of the flexible switching device The number is equal and not less than the number of AO signals required by the controlled object;

The number of channels of the digital input DI boards in each control system, the number of channels of the digital output DO boards of each group on the control system side of the flexible switching device, and the channels of the digital input DI boards on the controlled object side of the flexible switching device The number is equal and not less than the number of DI signals required by the controlled object;

The number of channels of analog input AI boards in each control system, the number of channels of each group of analog output AO boards on the control system side of the flexible switching device, and the channels of the analog input AI boards on the controlled object side of the flexible switching device The number is equal and not less than the number of AI signals required by the controlled object;

Each channel of the switch output DO board in each control system is respectively connected with each channel of the switch input DI board of the corresponding group on the control system side of the flexible switching device;

Each channel of the analog output AO board in each control system is respectively connected with each channel of the analog input AI board of the corresponding group on the control system side of the flexible switching device;

Each channel of the switch input DI board in each control system is respectively connected with each channel of the switch output DO board of the corresponding group on the control system side of the flexible switching device;

Each channel of the analog input AI board in each control system is respectively connected with each channel of the analog output AO board of the corresponding group on the control system side of the flexible switching device;

Each channel of the switch output DO board on the controlled object side of the flexible switching device is connected with the switch command terminal of the controlled object, and transmits the switch command signal;

Each channel of the analog output AO board on the controlled object side of the flexible switching device is connected to the analog command terminal of the controlled object, and transmits the analog command signal;

Each channel of the switch input DI board on the controlled object side of the flexible switching device is connected to the switch status terminal of the controlled object, and transmits the switch status signal;

Each channel of the analog input AI board on the controlled object side of the flexible switching device is connected to the analog detection terminal of the controlled object, and transmits the analog detection signal;

n sets of control systems, control the controlled object according to the content of the automatic experiment, n≥2, in each experiment, only one set of control systems can be selected for the control experiment;

The flexible switching device completes the real-time switching between n sets of control systems, completes the real-time switching between different channels on the same type of I/O board in n sets of control systems, and has the function of configuring the time delay of the controlled object. A generalized controlled object with a time delay to complete automated experiments with time delay;

The switching computer system in the flexible switching device is realized by using industrial computer or embedded system or PLC or DCS;

In the switching computer system, run flexible switching software;

The flexible switching software includes a man-machine interface operation panel program and a logic control program. The experimenter performs control system selection, channel configuration and time-delay configuration operations on the man-machine interface operation panel. When the configuration is completed, the logic control program will Real-time signal transmission is performed between the I/O board channel of the corresponding group on the control system side and the I/O board card channel on the controlled object side according to the selected or configured control system, channel and time delay.

The control system selection on the man-machine interface operation panel means that the experimenter selects the desired control system on the man-machine interface operation panel, and can only select one set of control systems at a time. If this control system is selected, it means that this time. The controlled object is controlled by the selected control system, and other control systems are forbidden to be used in this experiment.

The channel configuration on the man-machine interface operation panel means that the experimenter manually selects the desired associated channel, or imports the configuration file of the desired associated channel on the man-machine interface operation panel. When the experimenter selects a certain control system After the channel configuration is determined, a unique set of one-to-one correspondence is formed between the signal terminals of the controlled object and the channels of the I/O board of the selected control system.

The signal terminals of the controlled object include: a digital command terminal of the controlled object, an analog command terminal of the controlled object, a digital state terminal of the controlled object, and an analog detection terminal of the controlled object.

The time delay configuration on the man-machine interface operation panel means that if the experimenter needs a time delay of t seconds for a certain analog detection signal from the controlled object, the time delay of the signal is configured on the man-machine interface operation panel. The time is t seconds. After the flexible switching system is running, the analog detection signal from the controlled object will be delayed for t seconds before it is output from the flexible switching device control system side and sent to the analog input AI of the corresponding control system. In the channel of the board card, a generalized controlled object with any time delay size with configuration function is formed.

The said logic control program performs real-time signal transmission means that after the control system is selected, it is completed in each cycle according to the channel configuration;

Send each digital input DI signal on the controlled object side of the flexible switching device to the designated digital output DO channel of the corresponding group on the control system side of the flexible switching device;

Send each digital input DI signal of the corresponding group on the control system side of the flexible switching device to the designated digital output DO channel on the controlled object side of the flexible switching device;

Send each analog input AI signal on the controlled object side of the flexible switching device to the designated analog output AO channel of the corresponding group on the control system side of the flexible switching device.

Send each analog input AI signal of the corresponding group on the control system side of the flexible switching device to the designated analog output AO channel on the controlled object side of the flexible switching device.

The flexible switching method of an automated experimental platform with time-delay configuration function is realized by a flexible switching device of an automated experimental platform with a time-delay configuration function, including a man-machine interface program and a logic control program:

The man-machine interface program includes steps A to F:

Step A. Initialize, start the computer system in the flexible switching device, and start the man-machine interface program;

Step B. The experimenter selects the control system on the man-machine interface operation panel;

Step C. Prompt on the man-machine interface operation panel: whether to import the channel configuration file, if not, go to step D, if so, go to step E;

Step D. Manually select the channel configuration and go to Step F;

Step E. Import the channel configuration file;

Step F. Configure or modify the time lag, and go to Step G;

The logic control program includes steps G to L, wherein steps G to J are in no particular order:

Step G. According to the selected control system and the completed channel configuration, read the switch status signal from the controlled object through the switch input DI board channel on the controlled object side of the flexible switching device, and transfer it to the selected The specified channel output of the switch output DO board in the corresponding I/O board group of the flexible switching device on the control system side is output to the selected control system;

Step H. According to the selected control system and the completed channel configuration, output the digital command signal of the DO board from the switch of the selected control system, and control the corresponding I/O board on the system side via the flexible switching device The switch input DI board channel in the group is read in, transferred to the designated channel output of the switch output DO board on the controlled object side of the flexible switching device, and output to the actuator of the controlled object;

Step 1. According to the control system that has been selected, the channel configuration that has been completed, the analog detection signal from the controlled object is read in through the analog input AI board channel on the controlled object side of the flexible switching device, according to the configured After the delay time delay, it is forwarded to the specified channel output of the analog output AO board in the corresponding I/O board group on the control system side of the selected flexible switching device, and output to the selected control system;

Step J. According to the selected control system and the completed channel configuration, output the analog command signal of the AO board from the selected control system and control the corresponding I/O board on the system side via the flexible switching device The analog input AI board channel in the group is read in, transferred to the designated channel output of the analog output AO board on the controlled object side of the flexible switching device, and output to the actuator of the controlled object;

Step K. Prompt on the man-machine interface operation panel: Is the control process over? If so, go to step L, if not, return to step F;

Step L. ends.

Beneficial technical effects:

The invention proposes a flexible switching device and method for an automated experimental platform with a time-delay configuration function, so that the detection instruments and actuators corresponding to different control systems and the same controlled object only need to be connected to the flexible switching device at the same time to be convenient and flexible It can realize the flexible switching between control systems, and can flexibly generate and configure the time delay of the controlled object, so that the research experiments and teaching experiments of industrial process control can be successfully completed, and it is not necessary to replace the control system and reconnect each time. A lot of experiment time, saving the workload of system maintenance.

Description of drawings

FIG. 1 is a schematic diagram of a system structure and a connection relationship according to an embodiment of the present invention;

2 is a flowchart of a flexible switching method for an automated experimental platform with a time-delay configuration function according to an embodiment of the present invention;

FIG. 3 is a schematic diagram of an embodiment of a flexible switching device according to an embodiment of the present invention;

In the figure: 1—control system, 1-1—control system 1, 1-2—control system 2, 1-n—control system n, 2—flexible switching device, 2-1—flexible switching device control system side I/ O board, 2-2—I/O board on the controlled object side of the flexible switching device, 2-3—switching computer system, 3—controlled object, 3-1—controlled process, 3-2—executor, 3-3—detection instrument, 23-1—switch command signal, 23-2—analog command signal, 32-1—switch status signal, 32-2—analog detection signal, E1—switch command terminal, E2—analog quantity command terminal, E3—switch quantity status terminal, E4—analog quantity detection terminal, 4—generalized controlled object.

Detailed ways

The invention will be further described below in conjunction with the accompanying drawings and specific implementation examples. In this embodiment, the air heating mixing process and its detection instrument and execution method described in the patent ZL201610363094.8 of a multivariable industrial process control experimental device will be used. As the controlled process, the mechanism will describe an embodiment of the present invention in detail.

As shown in Figure 1, the flexible switching device of the automated experiment platform with the function of time-delay configuration includes: the control system side I/O board 2-1, the controlled object side I/O board 2-2 and the switching computer system 2-1 3;

In the automation experiment platform with time-delay configuration function, n sets of control systems are connected to the flexible switching device 2 through the I/O board 2-1 on the control system side, and the flexible switching device 2 passes through the I/O board 2-1 on the controlled object side. 2 is connected to the controlled object 3;

Among them, the n sets of control systems include: control system 1-1, control system 1-2... card, analog output AO board, switch input DI board and analog input AI board;

In this embodiment, two sets of control systems are selected, namely n=2, which are Siemens S7-300 PLC control system and Rockwell L71 PLC control system respectively.

As one of the control systems in the experimental platform, the Siemens S7-300 PLC control system is equipped with 4 I/O boards, the specific model is: 1 16-channel switch output DO board, the model is: 6ES7 322-1BH01-0AA0 , 1 32-channel switch input DI board, model: 6ES7 321-1BL80-0AA0, 1 8-channel analog output AO board, model: 6ES7332-5HF00-0AB0, 1 8-channel analog input AI Board, model: 6ES7 331-7KF02-0AB0.

As one of the control systems in the experimental platform, the Rockwell L71PLC control system is equipped with 4 I/O boards, including 1 16-channel switch output DO board, model: 1756-OB16D, 1 32-channel Switch input DI board, model: 1756-IB32, 1 8-channel analog output AO board, model: 1756-OF8, 1 16-channel analog input AI board, model: 1756-IF16.

The flexible switching device in this embodiment includes a hardware system and a software system.

The switching computer system in the flexible switching device is realized by using industrial computer or embedded system or PLC or DCS;

The hardware system of the flexible switching device in this embodiment adopts another set of Siemens S7-300 PLC, which is different from the above Siemens S7-300 PLC control system, as the switching computer system, and is equipped with 3 sets of boards, of which 1 set of boards is controlled The board on the object side, this set of boards includes 4 boards, the specific model is: 1 16-channel switch output DO board, model: 6ES7 322-1BH01-0AA0, 1 32-channel switch input DI Board, model: 6ES7 321-1BL80-0AA0, 1 8-channel analog output AO board, model: 6ES7 332-5HF00-0AB0, 1 8-channel analog input AI board, model: 6ES7 331 -7KF02-0AB0; the other two sets of boards are the control system side boards, which are the control system side Siemens board and the control system side Rockwell board, with the same configuration, each set of boards includes 5 boards , the specific model is: 2 16-channel switch output DO boards, model: 6ES7 322-1BH01-0AA0, 1 32-channel switch input DI board, model: 6ES7 321-1BL80-0AA0, 1 8 Channel analog output AO board, model: 6ES7 332-5HF00-0AB0, one 8-channel analog input AI board, model: 6ES7 331-7KF02-0AB0.

The controlled object 3 includes: a controlled process 3-1, an executive mechanism 3-2 and a detection instrument 3-3;

The flexible switching device 2 and the controlled object 3 form a generalized controlled object 4;

Each channel of the switch output DO board in each control system is respectively connected with each channel of the switch input DI board of the corresponding group on the control system side of the flexible switching device;

Each channel of the analog output AO board in each control system is respectively connected with each channel of the analog input AI board of the corresponding group on the control system side of the flexible switching device;

Each channel of the switch input DI board in each control system is respectively connected with each channel of the switch output DO board of the corresponding group on the control system side of the flexible switching device;

Each channel of the analog input AI board in each control system is respectively connected with each channel of the analog output AO board of the corresponding group on the control system side of the flexible switching device;

As shown in Figure 3, the 4 boards of the Siemens S7-300 PLC control system are connected to the 5 boards of the Siemens group on the side of the flexible switching device control system in the form of channel-to-channel, wherein the Siemens on the side of the flexible switching device control system The 32-channel switch input DI board of the group only uses 16 channels, and the remaining channels are idle. The corresponding relationship between the Siemens control system and the Siemens group on the control system side of the flexible switching device is shown in Table 1:

Table 1: Corresponding relationship between Siemens control system and flexible switching device control system side connection:

As shown in Figure 3, connect the 4 boards of the Rockwell L71PLC control system to the 5 boards of the Rockwell group on the side of the flexible switching device control system in a channel-to-channel manner, wherein the flexible switching device controls The 32-channel digital input DI board of the Rockwell group on the system side only uses 16 channels, and the remaining channels are free. The 16-channel analog input AI board of the Rockwell L71PLC control system only uses 8 channels, and the remaining channels are free. The corresponding relationship between the Rockwell control system and the Rockwell group on the side of the flexible switching device control system is shown in Table 2.

Table 2: Corresponding relationship between Rockwell control system and flexible switching device control system side connection:

Each channel of the switch output DO board on the controlled object side of the flexible switching device is connected to the switch command terminal E1 of the controlled object, and transmits the switch command signal 23-1;

Each channel of the analog output AO board on the controlled object side of the flexible switching device is connected to the analog command terminal E2 of the controlled object, and transmits the analog command signal 23-2;

Each channel of the digital input DI board on the controlled object side of the flexible switching device is connected to the digital state terminal E3 of the controlled object, and transmits the digital state signal 32-1;

Each channel of the analog input AI board on the controlled object side of the flexible switching device is connected to the analog detection terminal E4 of the controlled object, and transmits the analog detection signal 32-2;

2 sets of control systems to control the controlled object according to the content of the automatic experiment. In each experiment, only one of the control systems can be selected for the control experiment;

The flexible switching device completes the real-time switching between the two control systems, completes the real-time switching between different channels on the same type of I/O board in the two control systems, and has the function of configuring the time delay of the controlled object, so that the A generalized controlled object with a time delay to complete automated experiments with time delay;

In the switching computer system, run flexible switching software;

In the Siemens S7-300 PLC switching computer system, the flexible switching software is run.

The flexible switching software is developed using WinCC configuration software and STEP 7 software package: specifically, the full version V7.0 of the SIMATIC WinCC system software and the SIMATIC S7STEP7V5.5.

The flexible switching software includes a man-machine interface operation panel program and a logic control program. The WinCC configuration software is used to develop the man-machine interface operation panel program, and the STEP 7 software package is used to develop the logic control program.

The flexible switching software includes a man-machine interface operation panel program and a logic control program. The experimenter performs control system selection, channel configuration and time-delay configuration operations on the man-machine interface operation panel. When the configuration is completed, the logic control program will Real-time signal transmission is performed between the I/O board channel of the corresponding group on the control system side and the I/O board card channel on the controlled object side according to the selected or configured control system, channel and time delay.

The control system selection on the man-machine interface operation panel means that the experimenter selects the desired control system on the man-machine interface operation panel, and can only select one set of control systems at a time. If this control system is selected, it means that this time. The controlled object is controlled by the selected control system, and other control systems are forbidden to be used in this experiment.

The channel configuration on the man-machine interface operation panel means that the experimenter manually selects the desired associated channel, or imports the configuration file of the desired associated channel on the man-machine interface operation panel. When the experimenter selects a certain control system After the channel configuration is determined, a unique set of one-to-one correspondence is formed between the signal terminals of the controlled object and the channels of the I/O board of the selected control system.

The time delay configuration on the man-machine interface operation panel means that if the experimenter needs a time delay of t seconds for a certain analog detection signal from the controlled object, the time delay of the signal is configured on the man-machine interface operation panel. The time is t seconds. After the flexible switching system is running, the analog detection signal from the controlled object will be delayed for t seconds before it is output from the flexible switching device control system side and sent to the analog input AI of the corresponding control system. In the channel of the board card, a generalized controlled object with any time delay size with configuration function is formed.

The said logic control program performs real-time signal transmission means that after the control system is selected, it is completed in each cycle according to the channel configuration;

Send each digital input DI signal on the controlled object side of the flexible switching device to the designated digital output DO channel of the corresponding group on the control system side of the flexible switching device;

Send each digital input DI signal of the corresponding group on the control system side of the flexible switching device to the designated digital output DO channel on the controlled object side of the flexible switching device;

Send each analog input AI signal on the controlled object side of the flexible switching device to the designated analog output AO channel of the corresponding group on the control system side of the flexible switching device.

Send each analog input AI signal of the corresponding group on the control system side of the flexible switching device to the designated analog output AO channel on the controlled object side of the flexible switching device.

The signal terminals of the controlled object include: a digital command terminal E1 of the controlled object, an analog command terminal E2 of the controlled object, a digital state terminal E3 of the controlled object, and an analog detection terminal E4 of the controlled object.

The channel configuration of Siemens PLC control system refers to the following four one-to-one correspondences, that is, from the 16 channels already used in the 6ES7 321-1BL80-0AA0 board of the Siemens group of the flexible switching device control system side to the controlled object side The one-to-one correspondence of the 16 channels of the 6ES7 322-1BH01-0AA0 board, from the 8 channels in the 6ES7 331-7KF02-0AB0 board of the Siemens group on the control system side of the flexible switching device to the 6ES7 332- The one-to-one correspondence of the 8 channels of the 5HF00-0AB0 board, from the 32 channels of the 6ES7 321-1BL80-0AA0 board on the controlled object side to the two 6ES7 322-1BH01-0AA0 boards in the Siemens group on the control system side The one-to-one correspondence of 32 channels, from the 8 channels of the 6ES7 331-7KF02-0AB0 board on the controlled object side to the 8 channels of the 6ES7 332-5HF00-0AB0 board of the Siemens group on the control system side. Correspondence. The above correspondence is shown in Table 3:

Table 3: Flexible switching device channel configuration Siemens group board:

The channel configuration of the Rockwell PLC control system refers to the following four one-to-one correspondences, that is, from the Siemens S7-300PLC and 6ES7 321-1BL80-0AA0 boards of the Rockwell group of the flexible switching device control system side The one-to-one correspondence between the 16 channels that have been used and the 16 channels of the 6ES7 322-1BH01-0AA0 board on the controlled object side, from the 6ES7 331-7KF02-0AB0 board of Rockwell on the control system side of the flexible switch One-to-one correspondence between the 8 channels of the 6ES7332-5HF00-0AB0 board on the controlled object side, from the 32 channels of the 6ES7 321-1BL80-0AA0 board on the controlled object side to the control system side The one-to-one correspondence of 32 channels of two 6ES7 322-1BH01-0AA0 boards in the Kwell group, from the 8 channels of the 6ES7 331-7KF02-0AB0 board on the controlled object side to the Rockwell on the control system side The one-to-one correspondence of the 8 channels of the 6ES7 332-5HF00-0AB0 board in the group. The above corresponding relationship is shown in Table 4:

Table 4: Flexible switching device channel configuration Siemens group board:

The example of selecting Siemens PLC control system for experiment is shown in Figure 2:

Run the man-machine interface operation panel program, including steps A to F:

Step A. Initialize, start the switching computer system of the flexible switching device, and start the man-machine interface operation panel program;

Step B. The experimenter selects the Siemens PLC control system on the man-machine interface operation panel, and the flexible switching device naturally shields the Rockwell PLC control system;

Step C. Prompt on the man-machine interface operation panel: whether to import the Siemens PLC control system channel configuration file, if not, go to step D, if so, go to step E;

Step D. Manually select the channel configuration and go to Step F;

Step E. Import the Siemens PLC control system channel configuration file;

Step F. In the 8 channels of the 6ES7 331-7KF02-0AB0 board on the controlled object side, select one or more channels that need to configure the time delay according to the experimental needs, configure or modify the time delay one by one, and go to step G ;

The logic control program includes steps G to L, wherein steps G to J are in no particular order:

Step G. According to the completed channel configuration, read in the switch status signal from the controlled object side through the 32 channels of the 6ES7 321-1BL80-0AA0 board on the controlled object side of the flexible switching device, and transfer it to the selected 2 pieces of 6ES7 322-1BH01-0AA0 boards of the Siemens group on the control system side of the flexible switching device have a total of 32 designated channel outputs, which are output to the Siemens PLC control system;

Step H. According to the channel configuration that has been completed, output the switch quantity command signal of the DO board from the Siemens PLC control system to the 6ES7 321-1BL80-0AA0 board in the Siemens group of the flexible switching device control system side. The 16 channels that have been used are read in, transferred to the 16 designated channels of the 6ES7 322-1BH01-0AA0 board on the controlled object side of the flexible switching device, and output to the controlled object's actuator;

Step 1. According to the channel configuration that has been completed, the analog detection signal from the controlled object is read in through 8 channels of the 6ES7 331-7KF02-0AB0 board card on the controlled object side of the flexible switching device, according to the configured time. After the delay time delay, it is transferred to the 8 designated channels of the 6ES7 332-5HF00-0AB0 board card in the Siemens group on the control system side of the flexible switching device, and output to the Siemens PLC control system;

Step J. According to the completed channel configuration, output the analog command signal of the AO board from the Siemens PLC control system to the 6ES7 331-7KF02-0AB0 board in the Siemens group of the flexible switching device control system side. 8 channels are read in and transferred to the 8 designated channels output of the 6ES7 332-5HF00-0AB0 board on the controlled object side of the flexible switching device, and output to the actuator of the controlled object;

Step K. Prompt on the man-machine interface operation panel: Is the control process over? If so, go to step L, if not, return to step F;

Step L. ends.

An example of selecting the Rockwell PLC control system for the experiment is shown in Figure 2:

Run the man-machine interface operation panel program, including steps A to F:

Step A. Initialize, start the switching computer system of the flexible switching device, and start the man-machine interface operation panel program;

Step B. The experimenter selects the Rockwell PLC control system on the man-machine interface operation panel, and the flexible switching device naturally shields the Siemens PLC control system;

Step C. Prompt on the man-machine interface operation panel: whether to import the Rockwell PLC control system channel configuration file, if not, go to step D, if yes, go to step E;

Step D. Manually select the channel configuration and go to Step F;

Step E. Import the Rockwell PLC control system channel configuration file;

Step F. In the 8 channels of the 6ES7 331-7KF02-0AB0 board on the controlled object side, select one or more channels that need to configure the time delay according to the experimental needs, configure or modify the time delay one by one, and go to step G ;

The logic control program includes steps G to L, wherein steps G to J are in no particular order:

Step G. According to the completed channel configuration, read in the switch status signal from the controlled object side through the 32 channels of the 6ES7 321-1BL80-0AA0 board on the controlled object side of the flexible switching device, and transfer it to the selected 2 pieces of 6ES7 322-1BH01-0AA0 boards of the Rockwell group on the flexible switching device control system side, a total of 32 designated channel outputs are output to the Rockwell PLC control system;

Step H. According to the channel configuration that has been completed, output the switch quantity command signal of the DO board from the Rockwell PLC control system, and control the 6ES7 321- of the Rockwell group on the system side via the flexible switch device. The 16 channels already used in the 1BL80-0AA0 board are read in, transferred to the 16 designated channels of the 6ES7322-1BH01-0AA0 board on the controlled object side of the flexible switching device, and output to the actuator of the controlled object;

Step 1. According to the channel configuration that has been completed, the analog detection signal from the controlled object is read in through 8 channels of the 6ES7 331-7KF02-0AB0 board card on the controlled object side of the flexible switching device, according to the configured time. After the delay time delay, it is transferred to the 8 designated channel outputs of the 6ES7 332-5HF00-0AB0 board in the Rockwell group of the flexible switching device control system side, and output to the Rockwell PLC control system;

Step J. According to the completed channel configuration, output the analog command signal of the AO board from the analog quantity of the Rockwell PLC control system, and control the 6ES7 331- The 8 channels of the 7KF02-0AB0 board are read in and transferred to the 8 designated channels of the 6ES7 332-5HF00-0AB0 board on the controlled object side of the flexible switching device, and output to the actuator of the controlled object;

Step K. Prompt on the man-machine interface operation panel: Is the control process over? If so, go to step L, if not, return to step F;

Step L. ends.

According to the above requirements, a set of flexible switching device is obtained. The device takes the air heating mixing process and its detection instruments and actuators as the controlled objects, and takes Siemens S7-300PLC control system and Rockwell L71PLC control system as the control system. In the experimental platform of the system, the flexible switching function that can be arbitrarily configured with time delay between two different control systems is realized. With the help of the flexible switching device, the experimenters can use Siemens S7-300 PLC control system and Rockwell respectively. The L71PLC control system performs all automated experiments described in patent ZL20160363094.8 (a multivariable industrial process control experimental device and method) and patent ZL201610362760.6 (industrial process control experimental device and method capable of obtaining non-minimum phase characteristics) .

Claims (5)

1. The flexible switching device of an automated experimental platform with a time-delay configuration function is characterized in that the flexible switching device of an automated experimental platform with a time-delay configuration function includes: a control system side I/O board, a controlled object side I/O board card and switch computer systems; The n sets of control systems in the automation experiment platform with time-delay configuration function are connected with the flexible switching device through the I/O board on the control system side, and the flexible switching device is connected with the controlled object through the I/O board on the controlled object side; Among the n sets of control systems, each control system contains 4 kinds of I/O boards, including: switch output DO board, analog output AO board, switch input DI board and analog input AI board; The controlled object includes: the controlled process, the executive mechanism and the detection instrument; The flexible switching device and the controlled object form a generalized controlled object; The I/O boards on the control system side of the flexible switching device are divided into n groups, and each group contains 4 kinds of I/O boards, including: switch output DO boards, analog output AO boards, and switch input DI Boards and analog input AI boards, each control system corresponds to a set of I/O boards on the control system side of a flexible switching device; The I/O board on the controlled object side of the flexible switching device includes 4 kinds of I/O boards, including: switch output DO board, analog output AO board, switch input DI board and analog input AI board; The number of channels of digital output DO boards in each control system, the number of channels of each group of digital input DI boards on the control system side of the flexible switching device, and the channels of the digital output DO boards on the controlled object side of the flexible switching device The number is equal and not less than the number of DO signals required by the controlled object; The number of channels of analog output AO boards in each control system, the number of channels of each group of analog input AI boards on the control system side of the flexible switching device, and the channels of the analog output AO boards on the controlled object side of the flexible switching device The number is equal and not less than the number of AO signals required by the controlled object; The number of channels of the digital input DI boards in each control system, the number of channels of the digital output DO boards of each group on the control system side of the flexible switching device, and the channels of the digital input DI boards on the controlled object side of the flexible switching device The number is equal and not less than the number of DI signals required by the controlled object; The number of channels of analog input AI boards in each control system, the number of channels of each group of analog output AO boards on the control system side of the flexible switching device, and the channels of the analog input AI boards on the controlled object side of the flexible switching device The number is equal and not less than the number of AI signals required by the controlled object; Each channel of the switch output DO board in each control system is respectively connected with each channel of the switch input DI board of the corresponding group on the control system side of the flexible switching device; Each channel of the analog output AO board in each control system is respectively connected with each channel of the analog input AI board of the corresponding group on the control system side of the flexible switching device; Each channel of the switch input DI board in each control system is respectively connected with each channel of the switch output DO board of the corresponding group on the control system side of the flexible switching device; Each channel of the analog input AI board in each control system is respectively connected with each channel of the analog output AO board of the corresponding group on the control system side of the flexible switching device; Each channel of the switch output DO board on the controlled object side of the flexible switching device is connected with the switch command terminal of the controlled object, and transmits the switch command signal; Each channel of the analog output AO board on the controlled object side of the flexible switching device is connected to the analog command terminal of the controlled object, and transmits the analog command signal; Each channel of the switch input DI board on the controlled object side of the flexible switching device is connected to the switch status terminal of the controlled object, and transmits the switch status signal; Each channel of the analog input AI board on the controlled object side of the flexible switching device is connected to the analog detection terminal of the controlled object, and transmits the analog detection signal; n sets of control systems, control the controlled object according to the content of the automatic experiment, n≥2, in each experiment, only one set of control systems can be selected for the control experiment; Through the flexible switching device, the real-time switching between n sets of control systems and the controlled object is completed, and the real-time switching between different channels on the same type of I/O board of n sets of control systems is completed, and it has the time delay of configuring the controlled object. function, obtain a generalized controlled object with any time delay, and complete the automatic experiment with time delay; The switching computer system in the flexible switching device is realized by using industrial computer or embedded system or PLC or DCS; In the switching computer system, run flexible switching software; The flexible switching software includes a man-machine interface operation panel program and a logic control program. The experimenter performs control system selection, channel configuration and time-delay configuration operations on the man-machine interface operation panel. When the configuration is completed, the logic control program will Real-time signal transmission is performed between the I/O board channel of the corresponding group on the control system side and the I/O board card channel on the controlled object side according to the selected or configured control system, channel and time delay. 2. according to the described automatic experiment platform flexible switching device of time-delay configuration function according to claim 1, it is characterized in that, described in the man-machine interface operation panel, carrying out the control system selection means, the experimenter selects on the man-machine interface operation panel For the required control system, only one control system can be selected at a time. If this control system is selected, it means that the selected control system controls the controlled object in this experiment, and other control systems are forbidden to be used in this experiment; The channel configuration on the man-machine interface operation panel means that the experimenter manually selects the desired associated channel, or imports the configuration file of the desired associated channel on the man-machine interface operation panel. When the experimenter selects a certain control system After the channel configuration is determined, a unique set of one-to-one correspondence is formed between the signal terminals of the controlled object and the channels of the I/O board of the selected control system; The time delay configuration on the man-machine interface operation panel means that if the experimenter needs a time delay of t seconds for a certain analog detection signal from the controlled object, the time delay of the signal is configured on the man-machine interface operation panel. The time is t seconds. After the flexible switching system is running, the analog detection signal from the controlled object will be delayed for t seconds before it is output from the flexible switching device control system side and sent to the analog input AI of the corresponding control system. In the channel of the board card, a generalized controlled object with any time delay size with configuration function is formed. 3. according to the described automatic experiment platform flexible switching device with time-delay configuration function according to claim 1, it is characterized in that, described logic control program carries out real-time signal transmission and refers to, after selecting control system, according to channel configuration, in each Completed in cycles: Send each digital input DI signal on the controlled object side of the flexible switching device to the designated digital output DO channel of the corresponding group on the control system side of the flexible switching device; Send each digital input DI signal of the corresponding group on the control system side of the flexible switching device to the designated digital output DO channel on the controlled object side of the flexible switching device; Send each analog input AI signal on the controlled object side of the flexible switching device to the designated analog output AO channel of the corresponding group on the control system side of the flexible switching device. Send each analog input AI signal of the corresponding group on the control system side of the flexible switching device to the designated analog output AO channel on the controlled object side of the flexible switching device. 4. The flexible switching device of an automated experimental platform with a time-delay configuration function according to claim 1, wherein the signal terminals of the controlled object comprise: a switch quantity command terminal of the controlled object, an analog quantity of the controlled object Command terminal, switch state terminal of the controlled object and analog detection terminal of the controlled object. 5. The flexible switching method of the automated experiment platform with time-delay configuration function is realized by the flexible switching device of the automated experiment platform with time-delay configuration function in claim 1, and it is characterized in that, comprising a man-machine interface program and a logic control program: The man-machine interface program includes steps A to F: Step A. Initialize, start the computer system in the flexible switching device, and start the man-machine interface program; Step B. The experimenter selects the control system on the man-machine interface operation panel; Step C. Prompt on the man-machine interface operation panel: whether to import the channel configuration file, if not, go to step D, if so, go to step E; Step D. Manually select the channel configuration and go to Step F; Step E. Import the channel configuration file; Step F. Configure or modify the time lag, and go to Step G; The logic control program includes steps G to L: Step G. According to the selected control system and the completed channel configuration, read the switch status signal from the controlled object through the switch input DI board channel on the controlled object side of the flexible switching device, and transfer it to the selected The specified channel output of the switch output DO board in the corresponding I/O board group of the flexible switching device on the control system side is output to the selected control system; Step H. According to the selected control system and the completed channel configuration, output the digital command signal of the DO board from the switch of the selected control system, and control the corresponding I/O board on the system side via the flexible switching device The switch input DI board channel in the group is read in, transferred to the designated channel output of the switch output DO board on the controlled object side of the flexible switching device, and output to the actuator of the controlled object; Step 1. According to the control system that has been selected, the channel configuration that has been completed, the analog detection signal from the controlled object is read in through the analog input AI board channel on the controlled object side of the flexible switching device, according to the configured After the delay time delay, it is forwarded to the specified channel output of the analog output AO board in the corresponding I/O board group on the control system side of the selected flexible switching device, and output to the selected control system; Step J. According to the selected control system and the completed channel configuration, output the analog command signal of the AO board from the selected control system and control the corresponding I/O board on the system side via the flexible switching device The analog input AI board channel in the group is read in, transferred to the designated channel output of the analog output AO board on the controlled object side of the flexible switching device, and output to the actuator of the controlled object; Step K. Prompt on the man-machine interface operation panel: Is the control process over? If so, go to step L, if not, return to step F; Step L. ends.

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