JPH0719170B2 - Method of debugging sequence program in programmable controller - Google Patents

Description

The present invention relates to a method for debugging a sequence program in a programmable controller.

[Conventional technology]

FIG. 2 is a configuration diagram showing a control system of a programmable controller to which a conventional method for debugging a sequence program in a programmable controller is applied. In FIG. 2, (1) is a sequence program creation and input for operating the programmable controller. Peripheral device that has the function of monitoring the output status and forcibly turning the input and output on and off regardless of the program, (2) is the CPU that controls the input and output according to the sequence program, (2a)
Is a calculation unit that forms part of the CPU (2), and (3) is the CPU
The controlled object is actually turned on and off by the input / output command from (2).
An I / O unit that performs FF, (4) is a control target connected to the I / O unit (3).

Next, the operation will be described. Normally, when you first create a sequence program, you debug it to remove bugs in the program. This debugging may be performed with or without connecting the control target (4) to the I / O unit (3), but even if the CPU (2) is suddenly operated normally, which part of the program is I can't judge if it's bad. Therefore, a signal from the I / O unit (3) indicating the on / off state of the input device that detects the state of the controlled object,
For example, the input signal is cut off, the CPU (2) is set to the execution state, and the simulated input information, for example, the input command is given by the key input from the peripheral device (1) to sequentially control the output state ( Judging by the state of 4) or the state of the LED that shows the output state of the I / O unit (3),
Take the method of debugging the program. When a bug is found, the program is modified and the above method of sequentially inputting commands from the beginning is repeated until the bug is eliminated.

[Problems to be solved by the invention]

Since the conventional programmable controller is configured as described above, it is necessary to re-input commands in order from the beginning to the end of debugging every time the program is modified when debugging the program.
Further, when the controlled object (4) becomes large and the capacity of the sequence program also becomes large, there is a problem that this work takes a very long time.

The present invention has been made to solve the above problems, and when debugging a program, even if the program is modified, it is possible to eliminate the loss of re-keying from the beginning and shorten the debugging time. To aim.

Another object of the present invention is, in addition to the above object, to eliminate a mistake in giving an input command when a key input is given again.

[Means for solving problems]

According to a method of debugging a sequence program in a programmable controller according to the present invention, an operator sets simulated input information indicating an on / off state of an input device for detecting a state of a controlled object to a peripheral device. When input via, simulated input information is the programmable controller CPU
No bugs are found in the operation of storing status information that has been input to the internal output contact, internal contact, timer, etc. in the status storage memory that can store this status information from the latest to a predetermined number of traces back. In this case, the second step is repeatedly executed, and if a bug is found in the second step, the operator stops the execution of the sequence program and corrects the sequence program, and a predetermined number stored in the status storage memory. After the internal output contact, internal contact, timer, etc. have been set based on any of the status information of 3), the execution of the sequence program is restarted and the 3rd step of returning to the 2nd step is provided. Is.

[Operation] In the debugging method of the sequence program in the programmable controller according to the present invention, the execution of the sequence program is started in the first step, and the operator inputs simulated input information indicating the on / off state of the input device via the peripheral device in the second step. Input, the simulated input information is input to the CPU of the programmable controller, and status information including information on internal output contacts, internal contacts, timers, etc. can be stored from the latest status information up to a predetermined number of times. The operation to be stored in the status storage memory is repeatedly executed when no bug is found. If a bug is found in the second stage, the operator stops the execution of the sequence program, corrects the sequence program, and stores the status storage memory. A predetermined number of stators stored in After the internal output contacts, internal contacts, timers, etc., have been set based on any of the information, the execution of the sequence program is restarted and the process returns to the second stage.

Example of Invention

An embodiment of the present invention will be described below with reference to the drawings. First
In the figure, the same reference numerals as those in FIG. 2 showing the conventional example indicate the same parts, and therefore the description thereof will be omitted. In the figure, (2
b) is a status storage memory for exchanging data with the operation unit (2a) inside the CPU (2).

Next, the operation will be described with reference to FIG. The controlled object (4) may or may not be connected to the I / O unit (3). Also, turn off the input signal from the I / O unit (3). Next, write the sequence program to the CPU (2) and execute this sequence program (step
S01).

The operator sequentially inputs input commands from the peripheral device (1) to the CPU (2) by key input. At this time, the CPU (2) stores all or part of the status information in the internal status storage memory (2b) each time the input command changes (step S02). The status information is information about the internal output contact, the internal contact, the timer, and the like. Assuming that one step is advanced each time one input command is given, the number of steps from the last step to be stored can be stored as the memory capacity is increased. If a bug is found in the sequence program on the way (step S03), the input command is stopped, the execution of the sequence program is stopped, and the sequence program is corrected (step S04). When the correction is completed, the sequence program is executed again. At this time, whether to initialize the status or to execute from the state indicated by the status information stored in the status storage memory (2b) (step S05) , Mode switching. The method of mode switching does not matter here. In addition, status storage memory (2b)
When executing from the state indicated by the status information stored in, the sequence program is started after the internal output contact, internal contact, timer, etc. are set based on this status information. Also, if you want to start execution from the step before the final step, you can enter a predetermined key from the peripheral device (1) to start from any step within the range stored in the status storage memory (2b). It is possible to start. Needless to say, after the execution of the sequence program is restarted, the process returns to step S02, and the debugging is continued until the debugging is completed. When the controlled object (4) is connected, the operation of the machine may be advanced in advance so as to correspond to the step to be started.

In the above embodiment, the status storage location is the CPU
(2) Although it is internal, it goes without saying that it does not change even if it is provided to other elements such as the peripheral device (1).

〔The invention's effect〕

As described above, according to the present invention, when the execution of the sequence program is started in the first step and the operator inputs the simulated input information indicating the on / off state of the input device through the peripheral device, the simulated input is performed. Information is input to the CPU of the programmable controller, and internal output contact, internal contact,
The operation of storing the status information having information such as a timer in the status storage memory capable of storing the status information from the latest one to a predetermined number of traces is repeatedly executed when no bug is found. If found, the operator stops the execution of the sequence program, corrects the sequence program,
An internal output contact based on any of the predetermined number of status information stored in the status storage memory,
After setting the internal contacts, timer, etc., the execution of the sequence program is restarted and the process is returned to the second stage again, so that it is possible to save the trouble of inputting the same input command from the beginning each time the sequence program is modified. ,
Execution of the sequence program can be resumed from any step from the stopped step to the step that is traced back by a predetermined number of steps, and the efficiency of debugging can be improved.

[Brief description of drawings]

FIG. 1 is a block diagram of a control system showing a programmable controller to which a method for debugging a sequence program in a programmable controller according to an embodiment of the present invention is applied, FIG. 2 is a block diagram of a conventional control system, and FIG. It is a flow figure showing the debugging method of the sequence program in the programmable controller by one example of the invention. In the figure, (2b) is a status storage memory. In the drawings, the same reference numerals indicate the same or corresponding parts.

Claims (1)

[Claims] 1. A first step of starting execution of a sequence program, and when the operator inputs simulated input information indicating an on / off state of an input device for detecting a state of a controlled object through a peripheral device, the simulated input information. Of the programmable controller
A bug was found in the operation of storing status information that has been input to the CPU and has information such as internal output contacts, internal contacts, timers, etc. If not, the operator stops the execution of the sequence program and corrects the sequence program if a bug is found in the second step, and it is stored in the status storage memory. After the internal output contact, the internal contact, the timer, etc. are set based on any one of the predetermined number of status information, the execution of the sequence program is restarted and the process returns to the second stage. And a sequence program device in a programmable controller characterized by having Grayed way.