JPH0773266B2 - Polling control system - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Overview The present invention stores the polling address of each slave station in a memory device as well as the polling addresses of the slave stations before and after the sequence of a sequence of slave stations. Since the area address of the existing memory area is stored, it is easy to change the polling priority and order of the slave station.

[Industrial application field]

The present invention relates to a polling control method, and in particular, a plurality of slave stations branch-connected to a master station is divided into a plurality of slave station groups with a predetermined priority order, and a series of ordered slave stations belonging to the slave station group is divided. The present invention relates to a polling control method in which at least information about polling addresses of each slave station, each slave station group, and order is stored in a memory device, and the information is read to perform polling.

[Conventional technology]

Conventionally, with respect to a plurality of slave stations that are branched and connected to the master station, the master station polls and calls the slave station for transmission, and the slave station responds to the polling to establish a line link. There is a line form in which data is transmitted by using this method.

In the line configuration, the priority order of the number of polling is determined according to the transmission / reception frequency of each slave station, and the polling signal is output from the master station according to the priority order.

As the priority order of this polling, for example, as shown in FIG. 3, a plurality of slave stations are divided into a plurality of slave station groups, and
The slave stations are ranked, and levels 1 to X are associated in descending order of priority. The priorities are set in descending order of the frequency of normal polling. Within each slave station group, there is a series of ordered slave stations.

For example, in FIG. 3, it is assumed that the slave station designated by the polling address M1 has the highest priority and the slave station designated by Mn also has the lowest priority.

Such information regarding the polling address of each slave station, each slave station group, order, etc. is stored in the memory device in the master station, and such information is read from the memory device for polling.

Conventionally, as shown in FIG. 6, there has been a polling control system in which such information is stored in a memory device and polling is performed.

In the polling control method according to the present example, as shown in FIG. 6, a memory area (cell area) 161, ... 16x indicating a plurality of slave station groups having priorities is provided in the memory device, and In the memory area 161, ... 16x indicating the slave station group, in order to indicate an ordered series of slave stations belonging to the slave station group, polling of the slave station at the head of the sequence among the slave stations belonging to the slave station group is performed. The area address (cell address) of the memory area where the address is stored and the area address of the memory area where the polling address of the slave station at the end of the order is stored are stored to specify the priority order. Was doing.

Further, the memory areas 131, ... 13n in which the polling addresses of the respective slave stations are stored are stored in the memory device according to the order of the slave stations of the slave station in the memory device.
The information about the correspondence between the slave station group and a series of slave stations and the order of the slave stations in the slave station group is stored by storing in the slave station group.

Further, in the conventional polling control method, when changing the priority order and order of the slave stations, for example, when changing the priority order of the slave station 37 in FIG.
Follow the procedure shown in the figure.

That is, in this example, first, the slave station 37 needs to be separated from the slave station group to which it belongs. Steps to disconnect the slave station 37
In S11, the contents in the slave station memory area of the slave station 37 belonging to the level 2, which is the slave station group to which the slave station 37 belongs, are read.

Except for the slave station memory area of the slave station 37 that is disconnected in step S12, the slave station memory areas of the slave stations to which the slave station group belongs are rearranged and stored in the slave station 36 and subsequent slave station memory areas. The contents of the slave station area memory of the slave station must be stored again by shifting the area memories one by one.

In step S13, the last area address of the slave station to which the slave station group belongs must be changed to indicate the slave station group because the rearrangement has been performed in step S12. If the first slave station of the relevant slave station group is excluded, it is necessary to change the first and last area addresses.

Next, the child station 37 is inserted.

For example, when the slave station 37 is to be inserted next to the slave station 33 belonging to the slave station group of level 1, it corresponds to the slave station group of level 1 which is the slave station group to which the slave station to be inserted in step S14 belongs. Read the memory area of the slave station.

In the memory area of the slave station 33, the contents of the slave station 37 to be inserted in step S15 are written in the memory area of the slave station 33, and the contents of the slave station 33 are written in the memory area of the slave station 34. Write the contents in.

Further, in step S16, it is necessary to rewrite the area address of the last slave station belonging to the slave station group in order to indicate the slave station group.

[Problems to be solved by the invention]

By the way, in the conventional polling control method, when the priority order and order of the slave stations are to be changed, as described above, in the memory area of the slave station whose order is to be changed, Not only the contents but also the contents in the memory area of other slave stations and the contents in the memory area indicating the slave station group must be changed, so changing the priority order takes time and effort, so the polling order Also, there was a problem that changing the priority was inefficient. This is because, in the conventional method, the order of the slave stations in each slave station group is displayed in the order of storage in the memory device.

Therefore, the present invention has been made in order to solve the above problems, and an object thereof is to provide a polling control method capable of efficiently changing the priority order and the order.

[Means for solving problems]

In order to solve the above-mentioned problems, the present invention divides a plurality of slave stations 3 branch-connected to the master station 1 into a plurality of slave station groups having a priority order, as shown in FIG. In the polling control method in which the information about each slave station 3 is stored in the memory device 2 provided in the master station 1 and the information is read to perform polling for the series of ordered slave stations 3 belonging to the memory device 2 Polling of each slave station 3 in
In the memory area for each slave station 31, ... 3n for storing the addresses, the storage positions in the memory of the memory device 2 of the slave station memory areas corresponding to the slave stations 3 before and after the slave station 3 are stored in the memory according to the order. 4n for front slave station area address storage units, and 4n for rear slave station area address storage units 51, ...
Is provided.

[Action]

In this method, in order to disconnect a certain slave station 3, the memory area 31, ... 3n of the slave station 3 is read and stored in the previous slave station area address storage unit 41, ... 4n provided in the area. Reads the memory area of the slave station immediately preceding the slave station from the area address and separates it into the rear slave station area address storage units 51, ... Stores the stored area address. In addition, the slave station area address storage units 51, ...
The memory area of the subsequent slave station stored in the area is read, and the previous slave station area address storage unit 4 provided in the area is read.
It suffices to store the area address of the immediately preceding slave station to be separated into 1, ... 4n.

On the other hand, when inserting a certain slave station 3 after a predetermined slave station,
The previous slave station into which the area address of the slave station memory area 31, ... 3n in which the polling address of the certain slave station is stored, that is, the slave station area address storage unit after the predetermined slave station is inserted 51, ... 5n, the slave station area address storage unit of the slave station to be inserted 41 ... 4n The slave station area address of the immediately preceding slave station to be inserted and stored in the slave station to be inserted The area address of the succeeding slave station to be inserted is stored in the succeeding slave station area address storage section, and is inserted into the preceding slave station area address storage section of the succeeding slave station to be inserted. The area address of the slave station may be stored.

In this system, when there is a polling instruction, the slave station group having a higher priority is first read from the information about the slave station group stored in the memory device 2. Further, among the series of ordered slave stations 3 belonging to the slave station group stored in the memory device 2, the slave station memory area 3m corresponding to the first slave station 3 in the order is stored. The polling address corresponding to the slave station 3 in question is read out, and polling is performed using the polling address.

The next polling instruction is stored in the memory area. Or, the information of the next highest priority slave station group is read according to the priority information between the slave station groups set from the outside, and as described above, of the sequence of the slave stations belonging to the slave station group. The polling address corresponding to the slave station 3 stored in the slave station memory area 3p corresponding to the slave station 3 corresponding to the first order is read.

When there is an instruction to poll the slave station group again, the next slave station in the order stored in the subsequent slave station area address storage unit 5m in the slave station memory area 3m that is read first The area address corresponding to 3 is read out,
The polling address of the corresponding slave station 3 stored in the memory area is read.

In this way, polling is performed according to the above order according to the area address stored in the rear child station area address storage unit provided in the memory area of each child station of the sequential memory device.

〔Example〕

 Next, examples of the present invention will be described.

FIG. 2 shows a block diagram according to the embodiment.

The master station 18 according to the present embodiment has a polling instruction section 17 for instructing to read the polling address of each slave station, a polling address of each slave station, a slave station group having a series of ordered slave stations, and priority. A memory device 13 that stores information such as rank and order, a transmission unit 14 that transmits a polling signal obtained from a polling address read from the memory device 13, and a signal or data transmitted from each slave station. It has a receiving section 15 for receiving and a response signal detecting means 16 for detecting whether or not the receiving section 15 has a response signal to the polling signal from the master station 18.

The polling instructing unit 17 is a monitoring CPU 11 that issues an instruction for polling based on a command issued when the response signal detecting unit 16 detects a response signal, and a preset plan in the memory device 13 according to an instruction from the monitoring CPU 11. A scheduler that gives instructions to read the polling address of each slave station based on the total number of polls for each slave station.
It has 12 and.

As shown in FIG. 4, the memory device 13 stores the polling address of each slave station, information about a series of slave stations belonging to each slave station group, and the like.

In FIG. 4, the slave station group memory areas 601, ... 60n are stored in the priority order determined in descending order of the frequency of polling of the slave station group, and each memory area (memory cell area) 601 ,. In 60n, the area address (cell address) of the slave station memory area in which the polling address of the head slave station of the series of ordered slave stations belonging to the slave station group is stored is the head area address storage unit 701, The area address of the slave station memory area in which the polling address of the last slave station is stored in the final area address storage unit 801, ... 80n. Also,
The memory area 601, ..., 60n for each slave station group stores the area address for the slave station that is currently polled in the current area address storage unit 901, ... 90n, and then becomes the polling order for the slave station group. In case of polling, the slave station to be polled is specified.

Further, as shown in FIG. 4, the memory device 13 stores the polling addresses M1, ... Mn of each slave station in the slave station memory areas 301 ,. 40n (hereinafter referred to as "B section") and rear slave station area address storage units 401, ... which store the area addresses of the slave station memory areas 301, ... 30n for the slave station respectively. .. 50n (hereinafter referred to as "A section") are provided in the respective slave station memory areas 301 ,.

This embodiment operates as follows.

In this method, the scheduler 1 is sent by the polling instruction from the monitoring CPU 11 in the polling instruction unit 17.
2 instructs the memory device 13 to read according to a preset plan. When instructed by the scheduler 12, the memory device 13 first reads the slave station group memory area 601 in which the information about the slave station group of the highest priority level 1 is stored according to the priority order of the number of polling. , Based on the information, a slave station memory area corresponding to the first slave station among a series of ordered slave stations belonging to the slave station group, for example, the slave station stored in the slave station memory area 301. The polling address of is read.

The read polling address is transmitted as a polling signal by the transmitter 14 to each slave station.

Further, the next polling instruction is such that the information of the next highest priority slave station group is read based on the priority information between the slave station groups stored in the memory area. The polling address corresponding to the slave station stored in the slave station memory area corresponding to the slave station corresponding to the first order in the sequence of the slave stations belonging to the slave station group is read out. Become.

In this manner, when the polling instruction unit 17 again reads the slave station group having the highest priority, the subsequent slave station area address storage unit 50m in the slave station memory area 30m that is read first
The area address corresponding to the next slave station 3 stored in the above-mentioned order is read out, and the polling address of the corresponding slave station 3 is read out.

By this method, for example, as shown in FIG. 3, the slave station 37 belonging to the group of slave stations of level 2 is separated and the slave station is set to level 1
A change to be inserted in the front part of the slave station 33 in the slave station group is performed as follows.

First, as shown in FIG. 5, it is stored in the A section (rear slave station area address storage section) 507 of the slave station memory area 307 corresponding to the slave station 37 to be disconnected in step S1. The area address is stored in the A section 506 provided in the child station memory area 306 corresponding to the immediately preceding child station 36.

Further, the area address stored in the B section (previous slave station area address storage section) 407 of the slave station memory area 307 corresponding to the slave station 37 to be separated in step S2 is set to the order 1
B section 4 in the slave station memory area 308 corresponding to the succeeding slave station 38
Store in 08.

As a result, when the polling instruction unit 17 polls the slave station 36 of the slave station group to which the slave station 37 belongs, and when polling the slave station group next time, the slave station memory area corresponding to the slave station 36. A station 506 in 306 has a slave station 37 to be separated.
The area address of the slave station 36 is not stored, but the area address of the slave station 38 that has skipped the slave station 37 is stored.
When the polling of the slave station is completed, the slave station 37 will be disconnected without being polled when the polling order of the slave station group comes next.

On the other hand, consider a case where the slave station 37 is inserted before the slave station 33 belonging to the level 1 slave station group.

In step S3, the area address stored in the A section 502 of the slave station memory area 302 for the immediately previous slave station 32 is stored in the A section 507 of the slave station 37 to be inserted.

The slave station 33 after the portion where the slave station 37 separated in step S4 is to be inserted is the slave station in which the area address stored in the B portion 403 of the slave station address area 303 is to be inserted.
Write in B section 407 of 37.

In step S5, the B portion 402 of the slave station memory area 302 corresponding to the slave station 33 after the portion to be inserted and the A portion 502 of the slave station memory area 302 of the slave station 32 immediately before the portion to be inserted are 502. The area address of the child station memory area 307 of the child station 37 to be inserted into each of the two is newly stored.

As a result, when the polling instructing unit 17 polls the slave station 32 of the slave station group corresponding to level 1 and then receives a polling instruction from the polling instructing unit 17 again for the slave station group, the polling instruction unit 17 is shown in FIG. As shown, a slave station group memory area 60 that stores information about level 1 slave stations
Based on the information about the slave station that is currently polling stored in 1, the area address stored in the B section 502 of the slave station memory area 302 corresponding to the slave station is the area address of the slave station 33. Newly inserted slave station in place of 37
Since the area address corresponding to is stored, the instruction is given to the slave station 37. After the slave station 37 is polled, proceed to the next slave station 33 indicating the area address stored in the B area 507 of the slave station memory area 307 corresponding to the slave station 37. become.

〔The invention's effect〕

In this method, a front slave station area address storage unit and a rear slave station area address storage unit are provided in each memory area storing the polling address of each slave station, and the areas corresponding to the respective storage units are provided. Since the order of the slave stations in each slave station group is displayed by storing the address, it is necessary to display the order by storing the polling address of each slave station in the memory device according to the order. There is no.
Therefore, when changing the priority order or the order, it is not necessary to change the order of all the slave stations belonging to the slave station group to be changed as in the conventional case, and the slave station to be changed and the sequence before and after it. The order can be changed simply by changing the area address stored in the front slave station area address storage section or the rear area address storage section, and the polling order can be changed easily, at high speed, and reliably. You can

[Brief description of drawings]

1 is a block diagram of the principle of the present invention, FIG. 2 is a block diagram according to an embodiment, FIG. 3 is a conceptual diagram of a polling table,
FIG. 4 is a diagram showing a storage example according to the embodiment, FIG. 5 is a flow chart according to the embodiment, and FIG. 6 is a view showing a storage example according to a conventional example.
FIG. 7 is a flow chart according to the conventional example. 1 ... Master station 2 ... Memory device 3 ... Slave station 31, ... 3n ... Slave station memory area 41, ... 4n ... Previous slave station area address storage section (B section) 51, ... 5n ... Rear Slave station area address storage section (A section)

Claims (1)

[Claims] 1. A plurality of slave stations (3) branch-connected to a master station (1) are divided into a plurality of slave station groups having a predetermined priority order, and a series of ordered slave stations belonging to the slave station group. Regarding (3), in the polling control method in which the information about each slave station (3) is stored in the memory device (2) provided in the master station (1) and the information is read to perform polling, the memory device (2 ) Polling of each slave station (3)
Memory area for each slave station that stores addresses (31), ... (3
In n), according to the order, store the area address indicating the storage position on the memory of the memory device (2) of the child station memory area corresponding to the child station (3) before and after the child station (3). A polling control method characterized in that a front slave station area address storage unit (41), ... (4n) and a rear slave station area address storage unit (51), ... (5n) are provided.