RU29601U1 - UNIVERSAL MULTI-CHANNEL REGULATOR - Google Patents

Description

UNIVERSAL MULTI-CHANNEL REGULATOR

The utility model relates to the field of automation of control processes, in particular to systems providing control of actuators in remote access mode with monitoring on a computer display.

Known multi-channel controller containing signal sources in the form of sensors, control devices associated with actuators, connected to a remotely located computer post, a microprocessor unit made in the housing, made with non-volatile storage device and corresponding software for comparison in each channel received from connected to this the channel of the signal sensor with the set preset value and issuing a control signal to the device is controlled I to change the physical state of an actuator (US, Patent 5128855 №, G06F 15/16, publ. 07.07.1992).

The disadvantage of this regulator is that it can be configured according to the threshold values of the monitored parameters only from a computer station, from which monitoring is also carried out. At the same time, there is a need to regulate the set parameters not only from a remotely located monitoring station, but also directly at the location of the regulator, especially during technological, tuning and repair operations.

This utility model is aimed at solving the technical problem of providing the possibility of entering the installation parameters from the front panel of the controller and expanding the capabilities of control and regulation of actuators.

The technical result achieved in this case is the expansion of operational characteristics by providing the ability to enter installation data both from a remotely located computer post and from a button device of the controller itself.

The specified technical result is achieved by the fact that in a universal multi-channel controller containing signal sources in the form of sensors, control devices connected to actuators, a microprocessor unit made in the housing, connected to a remotely located computer post, made with non-volatile storage device and corresponding software for comparison in each channel received from the signal sensor connected to this channel with installed

G06F 15/16

a preset value and issuing a control signal to the control device to change the physical state of the actuator, a display is mounted on the microprocessor unit housing for displaying parameter values and a button-type input device for inputting adjustable values of control parameters for each channel into the microprocessor unit and storing them in non-volatile memory , in each channel, the microprocessor unit is connected at the output to two independent control devices on t anzistor keys for one actuator, each of which is designed to change the position of the actuator control element in opposite directions, the microprocessor unit includes an analog-to-digital converter connected to the sensor outputs, integrated into a single-chip microcontroller for digital filtering, processing the received digital signals , polling buttons, generating signals for indication and control, and data exchange signals with remotely located computer post, while the microprocessor unit is configured to automatically restart the control program when the functioning of the software is impaired.

These features are significant and interconnected with the formation of a stable set of essential features sufficient to obtain the desired technical result.

The present utility model is illustrated by a concrete example, which, however, is not the only possible one, but clearly demonstrates the possibility of achieving the required technical result by the given combination of features.

In FIG. 1 is a block diagram of a controller;

FIG. 2 - the appearance of the housing from the front panel;

FIG. 3 is a state diagram of the output of the “direct control device in the“ on-off heater mode;

FIG. 4 is a state diagram of the output of the "direct control device in the on-off mode" refrigerator;

FIG. 5 is a state diagram of an output of a first channel control device in a two-position “limiter” mode;

FIG. 6 is a state diagram of an output of a second channel control device in a two-position “limiter” mode;

FIG. 8 is a state diagram of the output of a “direct control device in on-off mode“ U-shaped.

According to this utility model, a universal multi-channel controller contains signal sources in the form of sensors 1. Control devices 3 made in a separate housing 2, connected to actuators (not shown), microprocessor unit 4 connected to a remotely located computer post, made with non-volatile memory and corresponding software for comparison in each channel received from the signal sensor connected to this channel with the set m value and outputting a control signal to the control device to change the physical state of the actuator.

On the housing 2 of the microprocessor unit, a display 5 is mounted for displaying parameter values and a push-button type input device 6 for entering into the microprocessor unit the set control parameter values for each channel and storing them in a non-volatile memory.

In each channel, the microprocessor unit is connected at the output to two independent control devices on transistor switches for one actuator, each of which is designed to change the position of the actuator control element in opposite directions to each other.

The microprocessor unit includes an analog-to-digital converter connected to the sensor outputs, integrated into a single-chip microcontroller for digital filtering, processing received digital signals, polling buttons, generating signals for indicating and controlling and data exchange signals with a remotely located computer post, while the microprocessor unit performed with the function of automatic restart of the control program in case of software malfunction.

The following is an example of a specific implementation of a multi-channel controller.

The controller (Fig .. 1) is designed to control and maintain the temperature or other physical parameter measured by the controller with high accuracy on 8 input channels, simultaneously control several (up to 8) actuators, as well as to register parameter values on a computer and remote device control.

the instrument receives a unified signal of current or voltage 4..20 mA, 20..4 mA, 0..5 mA, 0..10 mA, 0..10 V, etc. This allows the use of a regulator to control pressure, flow, humidity and other physical quantities, if sensors with a unified output current signal are used for this. The signals from the inputs of the device are fed to the logical device of the data processing unit.

The regulator has 16 outputs of the type "transistor switch (2 outputs per channel). The outputs are used to transmit control pulses to the actuators. The pulse duration is determined by the calculations carried out by the data processing unit. This unit is designed to process the input signal, scale it, filter, display the measured value and generate control signals. Each of the 8 control channels can operate in the PID controller mode (by resetting the corresponding coefficients, work is achieved according to PD, PI, P-algorithms), or in the on-off controller mode (“heater - direct hysteresis,“ refrigerator - reverse hysteresis, U-shaped and U- figurative). The operating mode (and all parameters of the selected control algorithm) is selected programmatically for each channel. The output actions are formed by pairs of PWM signals for each channel (“more and“ less).

The device is used to control actuators corresponding to input channels and using the principle of PWM control. Two control channels are allocated for each actuator (“bigger and less”), for which, depending on the measured value of the corresponding channel, the specified setpoint and the PID algorithm parameters, pulses of a certain duration are supplied by the device, allowing taking into account the inertia of the control object to bring the value of the measured parameter to set point. In case of deviations of the parameter value from the setpoint caused by external influences, the device adjusts and returns the parameter value to the closest possible limits from the setpoint (depending on the control object and the correct selection of the PID algorithm parameters). The following is the transistor switch control logic:

-P, PD, PI mode - regulation: by the principle of operation, they are completely similar to PID regulation, but one or two parameters of the PID algorithm are set to zero (for example, when the integral constant Ti is equal to zero, PD regulation is performed).

channel. The second device is inverse to the first. The output state diagram of the “direct control device is shown in FIG. 3.

- Two-position “refrigerator” mode: to control the actuator, an odpo control device for each adjustable channel is used. The second device is inverse to the first. The output state diagram of the “direct control device is shown in FIG. 4.

- Two-position mode “limiter: used to limit the position of the actuator during PID, PI, PD and P - regulation. The channel controlled by the “limiter is electrically connected (outside the device) with the channel to be limited, and with the help of its two control outputs it holds the value of the position of the actuator within the limits set by the user: from (Setpoint-Delta) to (Setpoint + Delta). This means that “the limiter does not allow the PID algorithm on the second channel associated with the limiting channel to derive, with its pulses, the position of the actuator beyond these boundaries. The state diagram of the outputs of the control devices is shown in FIG. 5, 6.

- Two-position mode “U-shaped: to control the actuator, one control device is used for each adjustable channel. The second device is inverse to the first. The output state diagram of the “direct control device is shown in FIG. 7.

- Two-position mode “U-shaped: to control the actuator uses one control device for each adjustable channel. The second device is inverse to the first. The output state diagram of the “direct control device is shown in FIG. 8.

The device has a built-in industrial network adapter RS-422 (RS-485). To increase the speed and reliability of the exchange, a four-wire (duplex) communication line was used, allowing two-way communication at a speed of 115200 bps at a distance between subscribers of up to 1200 m. By pair-wise contact closure, the RS-422 network can be turned into a half-duplex two-wire RS-485 network. The software protocol of exchange with the device allows both reading the values of the input channels of the device and its remote control by the computer. The protocol is open, described in detail and allows you to pair the device with any computer software and hardware.

The programming of the device is carried out by buttons located on the front panel. To select and edit parameters, use the on-screen menu in Russian, which allows you to quickly view or change the value of any parameter of the regulation law or the operating mode of the device in a standard way. All device settings can be password protected to prevent unauthorized access.

Structurally, the device is made in a plastic case for panel mounting. The power and external connections of the device are provided by connecting the corresponding lines to the terminal blocks located on the rear wall of the device. On the front panel of the device are located: a liquid crystal display, eight LED indicators and six control keys. The principle of operation of the device is a high-precision and high-speed voltage measurement proportional to the measured parameter. The voltage is supplied to the inputs of a multi-channel analog-to-digital converter built into a single-chip microcontroller for further digital filtering and processing (calculations using the selected control algorithm). In addition, the microcontroller provides a survey of buttons, the formation of signals for indication and control, as well as the exchange of information with a computer. All entered control parameters and operating modes are recorded in a non-volatile memory device, which ensures their safety and immutability when the device is turned off for any period of time.

The possibility of “freezing the device is excluded due to the presence of a built-in hardware watchdog timer, which automatically restarts the control program in the event of any malfunction or emergency stop of the program.

The regulator is operated as follows.

Applied voltage to the device. If the signal source and the line are in good condition, the display will show the channel number by which the measurement is made, the measured value, the dimension (if it is selected in the settings) and the setting value for this parameter (if the "Meter" mode is not selected in the settings). If instead of the value the blinking word “Open or Short circuit” is displayed, then the correct connection of the sensor, its serviceability, serviceability of the connecting line and the quality of the connections are checked.

To switch to the cyclic display mode of channels, press the “Up. After that, the device will cycle through the numbers of the displayed channels every 5 seconds until any key is pressed.

To view the settings of the device, it is transferred from the “OPERATION to the PASSWORD mode by pressing the Enter key, enter the correct password and by pressing the Enter key again go to the“ VIEW. To change the value of the selected setting parameter, press the Enter key and switch to the PROGRAM mode. In this case, a flashing cursor in the variable digit will appear on the display. Having changed the value as necessary, press the Enter key to save it in non-volatile memory, and then the Return key to return to the “VIEW. If the “Enter” key is not pressed before returning, then the value of the edited parameter returns to that which was before entering the “PROGRAMMING. You can also return from the “BROWSE” mode to the “WORK” mode by pressing the “Return. Also, return from the “BROWSE” and “PASSWORD” modes to the “OPERATION” mode (and from the “PROGRAMMING mode” to “BROWSE” mode) occurs automatically after 30 seconds if no key is pressed during this time.

In the “OPERATION” and “BROWSE” modes, use the Up and Down keys to change the number of the current channel, and in the PASSWORD and PROGRAM modes to change the digit highlighted by a blinking cursor. The device controls the correctness of the input and will not allow the installation of incorrect values that go beyond the limits acceptable for a particular parameter. In the “OPERATION” mode, use the “Return and Enter” keys simultaneously (first press “Return and without releasing it -“ Enter) to reset all settings to the initial (“factory”) values.

Claims (1)

A universal multi-channel controller containing signal sources in the form of sensors, control devices connected to actuators, a microprocessor unit made in a housing connected to a remotely located computer post, made with non-volatile memory and corresponding software for comparison in each channel received from connected to this channel of the signal sensor with a set set value and issuing a control signal to the control device phenomena for changing the physical state of the actuator, characterized in that a display for displaying parameter values and a push-button input device for inputting adjustable values of control parameters for each channel and storing them in non-volatile memory in each channel are mounted on the microprocessor unit housing the microprocessor unit is connected at the output to two independent control devices on transistor switches for one executive about the mechanism, each of which is designed to change the position of the control element of the actuator in opposite directions, the microprocessor unit includes an analog-to-digital converter connected to the sensor outputs, integrated into a single-chip microcontroller for digital filtering, processing received digital signals, polling buttons, generating signals for indication and control and data exchange signals with a remotely located computer post, while the microprocess polar unit is configured to auto restart function of the control program in violation of the software operation.