JPH0547842B2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a programmable sequence controller (hereinafter referred to as a PC) that programmably executes sequence control of various automated equipment,
In particular, the present invention relates to a programmable sequence controller that is configured to output information indicating the type of input/output to the input/output module of a PC, and has the function of self-diagnosing incorrect insertion of the input/output module and checking the logic of the sequence program.

In a conventional PC, the input module, output module, timer module,
Input/output modules such as analog input modules and analog output modules are not configured to output information indicating the type of input/output to the CPU of the PC. For this reason, for example, when maintaining a PC, the work of inserting an input/output module into a module rack relies on the operator's visual identification judgment. Therefore, if a worker mistakenly inserts an input/output module into the specified module rack, the PC will not be able to determine this insertion error, and there is a risk of a major accident occurring when operating the PC. .

Therefore, as a result of various studies to overcome the problems with conventional PCs mentioned above, the inventor of the present invention found that
The above-mentioned input/output module will be able to output information representing the type of input/output to the PC, and when the input/output module is correctly inserted, the PC will memorize the data regarding the rack number and type, and the data will be saved the next time the device is operated. The input/output module is checked based on this stored data, and if an input/output module insertion error occurs, the PC operation is immediately stopped and the position and type of the module where the insertion error occurred is displayed on the display. It was found that the above problems could be solved by doing so.

In addition, by configuring the input/output module to be able to output information indicating the type of input/output to the PC, it is possible to It has been found that it becomes possible to check the logic of a sequence program when using input/output addresses where there is no output module, making program creation convenient.

Accordingly, an object of the present invention is to provide a programmable sequence controller configured to insert an input/output module into a predetermined module rack, read a required sequence program from a memory storing the sequence program, and perform arithmetic control of input/output elements. The module rack is configured to store and display data related to the input/output modules inserted into the module rack, and can check the logic of input/output module insertion errors and sequence programs to ensure safe operation of the programmable sequence controller. To provide a programmable sequence controller with a self-diagnosis function.

In order to achieve the above object, the programmable sequence controller according to the present invention has a function of self-diagnosing insertion errors of input/output modules. A programmable sequence controller configured to read a sequence program and perform arithmetic control of input/output elements includes a first memory that stores the sequence program, and a memory that is output from each input/output module when the input/output module is inserted in advance. a second memory for storing data regarding input/output types and module rack numbers to be inserted; and input/output types and input/output types of input/output instructions used in the sequence program stored in the first memory. a third memory for storing data related to output addresses; data related to the type of input/output of the module rack number stored in the second memory; and data related to the type of input/output inserted in the module rack read at power-on. means for self-diagnosing insertion errors of input/output modules by comparing the data in correspondence with each other; and self-diagnosing the contents of the sequence program by comparing the data stored in the second memory and the third memory. means for inputting commands for storing data in the second memory and self-diagnosis of the sequence program, and displaying the results of the insertion error and self-diagnosis of the sequence program; It is characterized by comprising a panel.

Next, an embodiment of a programmable sequence controller PC having a function of self-diagnosing incorrect insertion of an input/output module according to the present invention will be described in detail with reference to the accompanying drawings.

FIG. 1 shows a block control circuit diagram of the programmable sequence controller PC of the present invention. That is, in FIG. 1, reference numeral 10 indicates the CPU
The unit 12 is a memory (second memory) 1 that stores the input/output type of the input/output module and the rack number into which the input/output module is inserted.
4 is a sequence program memory (first memory), 16 is a control program memory unit of the PC, 18 is an I/module interface, and 20 is a man-machine communication panel. Each of these components is
Control bus BL1 and address bus respectively
They are mutually coupled by BL2 and data bus BL3.

Incidentally, in the control program memory unit 16 of the PC, there is an I/O usage table (third memory) for the sequence program. In addition, I/module interface 18
from I/control bus BLL.
4. The input module 22 and the output module 24 are connected via an I/address bus BL5 and an I/data bus BL6.

Next, the operation of the control circuit of the PC having the above configuration will be explained below with reference to a flowchart.

FIG. 2 shows a processing system for storing the input/output types of the module and checking the logic of the sequence program when the input/output module is inserted into the control circuit shown in FIG. 1. First, when an input/output module is correctly inserted into a predetermined rack, a command to store the module type and rack number is issued through the man-machine communication panel 20. At this time, CPU10 is
Via the I/module interface 18, the I/rack with the lowest I/rack number is instructed to output the type of input/output module to the I/data bus. The input/output module inserted into the lowest I/O rack based on this instruction outputs data representing the type of input/output to the I/O data bus. Next, the CPU 10 reads data regarding the type of input/output module via the I/module interface 18, and
The type of input/output module in the lowest I/rack of the O rack number is written into the memory 12 for storing. In this way, the CPU 10 performs I/O
The rack number is incremented and executed repeatedly until the maximum rack number is reached, and data representing the type of input/output output from each inserted input/output module is stored in the storage memory 12, and a flag indicating that this storage has been performed is set. and complete the command.

Therefore, if the control circuit is configured to execute the commands described above, when the power is turned on (restarted), it will be determined based on the flag whether or not the input/output module is stored, and the storage will be executed. If it is not stored, turn the output module OFF, and if it is stored, import the data representing the input/output type from the input/output module inserted at the bottom of the I/O rack number and save it to memory 1.
Compare with the contents stored in 2. The operation of comparing the input/output type of the input/output module with the stored contents is performed in BLOCK 10 shown in FIG. 2. The processing system of this BLOCK10 is as shown in FIG. That is, in FIG. 4, when the comparison contents are different, the rack number of the input/output module and the input/output type are displayed together with the alarm code on the man-machine communication panel 20, and all input/output modules are displayed. Set to OFF state. Note that the alarm display is displayed on the SUB200 in the man-machine communication panel 20.
processing system. The processing system of this SUB 200 is as shown in FIG. 10, which will be described later.

As mentioned above, when the power is turned on,
When it is determined whether the input/output module is stored, if it is not stored, a command to store the module type and rack number can be issued again using the man-machine communication panel 20. The operation for storing the input/output type of this input/output module is performed using BLOCK3 shown in Figure 2.
It is done with 0. The processing system of this BLOCK 30 is as shown in FIG.

Also, when the sequence program is written to the sequence program memory 14 and the input/output type and rack number of the input/output module are stored in the memory 12, which stores the input/output type and rack number of the input/output module, the man-machine communication is started. When a program check command is issued from the communication panel 20, the CPU 10 reads out the sequence program in the sequence program memory 14 using the control program in the control program memory unit 16 of the PC, parses it into an instruction code and input/output address, and Perform the following logic check (see Figure 2).

That is, the logic check of the sequence program is performed by the control program memory unit 1.
6, the processing is performed by the SUB100 processing system.
The processing system of this SUB 100 is as shown in FIG. In the processing system shown in FIG. 6, first the sequence program usage table (third
memory). This usage table is
It has an input flag area that stores the presence of an input command, and an output flag area that stores the fact that an output command has been generated, each having the same number of input/output addresses as the maximum. In other words, the third memory has an input flag area and an output flag area that correspond one-to-one to each input/output address, and when an input (or output) command is received at each address, the input (or output) corresponding to that address is ) A flag is set in the instruction flag area.
In addition, each rack has a number of input/output addresses corresponding to the number of terminals of the module to be inserted, and each rack has input/output addresses in sequence from rack number 0 to the maximum rack number.From 0 to the address number corresponding to the total number of terminals. Assigned. For example, when a module with 16 terminals is inserted into rack number 0 and rack number 1, input/output addresses 0 to 15 are assigned to rack number 0, and input/output addresses 16 to 31 are assigned to rack number 1. Next, the sequence program memory (first memory)
Set the start address of 14 in the A register.
The instruction in the sequence program memory 14 corresponding to the address set in this A register is read and the instruction code is analyzed. At this time, as described above, when the instruction code is an input instruction or an output instruction, a flag is set in the input/output flag area of the input/output address of the usage table (third memory) corresponding to the input/output address of the instruction code. That is, an input flag is set for an input command, and an output flag is set for an output command. If the instruction code is other than an input instruction or an output instruction, nothing is done. The instruction code is analyzed by incrementing the A register until the end of the sequence program, and the usage table is completed. Next, a comparison check is made between this usage table (third memory) and the memory 12 (second memory) that stores the types of input/output. This memory 12 stores information on the type of input/output output from each input/output module (whether the input/output module corresponding to each rack number is an input module, whether the input/output module corresponding to each rack number is an output module, module or nothing is inserted) and the rack number to be inserted. First, set the lowest rack number to A.
Set in register. Next, the type of input/output corresponding to the rack number set in this A register is retrieved from the memory 12, and depending on the type of input/output, an input module, an output module, or no input/output module is selected. A logic check is performed on all input and output addresses of the usage table (third memory) corresponding to the rack number set in the A register. This logic check is performed by incrementing the A register up to the highest rack number. This logic check of the type of input/output is performed by the processing systems of BLOCKs 1 to 3, respectively. The processing system for BLOCKs 1 to 3 is as shown in FIGS. 7 to 9. Specific examples of checks using these BLOCKs 1 to 3 are as follows.

An output command is being issued to an input module (BLOCK2) It is an output module but only has input commands (BLOCK3) There is an instruction word that uses an input/output address where there is no input/output module (BLOCK1) Same output module There are two or more output commands (BLOCK1). Therefore, in the case where the above-mentioned ~ is applicable, an alarm is displayed on the man-machine communication panel 20. When displaying this alarm, the rack number of the input/output module and the type of input/output (instruction code) are displayed together with the alarm code. This alarm display is performed by the processing system of the SUB 200 shown in FIG.

As mentioned above, as a result of checking the logic of the sequence program for the input/output module,
If an alarm is displayed, the input/output module is turned off, and if no alarm is displayed, the sequence program is executed (see Figure 3). Therefore, since the input/output module for which an alarm has been displayed has been inserted into the module rack by mistake, safe operation of the PC can be ensured by reinserting it into the predetermined module rack.

Although the preferred embodiments of the present invention have been described above, the present invention is not limited to the above embodiments, and it goes without saying that various design changes can be made without departing from the spirit of the present invention.

[Brief explanation of drawings]

Fig. 1 is a control circuit diagram showing an embodiment of the PC of the present invention, Figs. 2 to 10 are flowcharts showing the control operation of the PC of the present invention, and Fig. 2 shows the basic control operation. Flowchart diagram, Figure 3 is a flowchart accompanying the flowchart shown in Figure 2, Figure 4 is a flowchart diagram showing details of BLOCK10 shown in Figure 2, Figure 5 is a flowchart diagram showing BLOCK30 shown in Figure 2. Flowchart diagram showing details of
Figure 6 is a flowchart showing details of BUB100 shown in Figure 2, Figure 7 is shown in Figure 6.
Flowchart showing details of BLOCK1, No. 8
The figure is a flowchart showing details of BLOCK 2 shown in Fig. 6, Fig. 9 is a flowchart showing details of BLOCK 3 shown in Fig. 6, and Fig. 10 is a flowchart showing details of BLOCK 3 shown in Fig. 6. FIG. 2 is a flowchart showing details of the SUB 200 shown in FIG. 10... CPU unit, 12... Memory for storing input/output types and rack numbers, 14... Sequence program memory, 16... Control program memory unit, 18... I/module interface, 20... Man-machine Communication panel, 22...Input module, 24...Output module, BL1...Control bus, BL2...Address bus, BL3...
Data bus, BL4...I/control bus,
BL5...I/address bus, BL6...I/
data bus.

Claims (1)

[Scope of Claims] 1. A programmable sequence controller configured to insert an input/output module into a predetermined module rack, read a required sequence program from a memory storing the sequence program, and perform arithmetic control of input/output elements, comprising: a first memory that stores a program; a second memory that stores data regarding the type of input/output output from each input/output module at the time when the input/output module is inserted in advance and the number of the module rack to be inserted; a third memory that stores data regarding input/output types and input/output addresses of input/output instructions used in the sequence program stored in the first memory; and a module rack stored in the second memory. means for self-diagnosing an insertion error in an input/output module by comparing the data regarding the type of input/output numbered in the module rack with the data regarding the type of input/output inserted in the module rack read when the power is turned on; means for self-diagnosing the contents of the sequence program by comparing the data stored in the second memory and the data stored in the third memory; A man-machine communication panel for inputting commands and displaying the results of the self-diagnosis of the insertion error and the sequence program. Programmable sequence controller.