JPH012103A - programmable controller - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field 1] The present invention relates to a programmable controller that has an instruction dedicated to stopping operations in a user program code, and has a mode dedicated to debugging in addition to execution and stopping.

[Background technology 1] When developing a user program for a programmable controller, how large is the user program? If it is possible to stop t at a specified address and monitor the status of each register, internal relay, and input/output in the programmable controller at that point, debugging efficiency can be improved.

Previously, the user had to insert a break instruction at the desired address in the program to temporarily stop the operation, so the user had to specify each address and insert the break instruction. It was necessary to repeat the same thing for the number of points, making the keystrokes complicated. Furthermore, when stopping debugging and transitioning to actual operation, it is necessary to repeat these break instructions as many times as they have been inserted, and process the successive addition and deletion of break instructions, which is inconvenient for the user.

[Objective of the Invention 1 The present invention has been made in view of the above-mentioned problems, and its purpose is to provide a programmable controller that can efficiently debug a user program. be.

[Disclosure of the Invention] (Configuration) The present invention includes a system ROM in which a system control program is written, and a battery-backed RAM for storing user programs.
In a programmable controller that performs arithmetic processing in a CPU based on a program stored in a CPU to automatically control equipment, has an instruction dedicated to stopping calculations in the user program code, and has a mode dedicated to debugging in addition to execution and stopping. , in the above debug-only mode,
A saving means for saving the program contents of an arbitrary address registered by the programmer at which the operation is desired to be stopped into memory and setting a flag to remember that the program has been saved; and a rewriting means for rewriting the contents of the registered address to a break instruction. and a return means that automatically writes the saved program contents to the original address and returns to the original program state when the program is moved from debug mode to run or stop mode, and the user By specifying only an arbitrary address without writing a break instruction, the program contents of the registered address are saved in memory by the saving means, and the contents of the registered address are written by the rewriting means with the break instruction. By rewriting it to , it is possible to set the conditions for stopping the operation, and when the break instruction set in this way is executed or transitioned to program mode, the program contents saved in the save memory are saved by the return means. By automatically writing to the original address and returning to the original program state, the break instruction is automatically deleted and the user does not have to perform the process of deleting the break instruction.
This makes it possible to efficiently perform debugging of user programs.

(Example 1) tjS1 to FIG. 8 show an embodiment of the present invention.

As shown in FIG. 2, the programmable controller of the present invention includes a system ROM 2 in which a system control program is stored, and a battery-backed RAM 3 for storing user programs.
The programmable controller performs arithmetic processing on the CPUI based on the program stored in the M3 to automatically control the equipment, and this programmable controller has a dedicated instruction for stopping calculations in the user program hood, and also has commands other than execution and stopping. Regarding those with a debug-only mode.

In this embodiment, in the above-described debug-only mode, operation 1 registered by the programmer: saves the program contents of any address desired to be stopped to the memory, and sets a flag to remember that the calculation has been saved. means for rewriting the contents of the registered address into a break instruction; and a rewriting means for rewriting the contents of the registered address into a break instruction; and return means for returning to the programmed state.

Figure 3 shows the general processing flow of the programmable controller.Ilo is refreshed and a normal sequence program is executed.After executing this sequence program, it enters the peripheral tool service state, and this peripheral tool service state It is now possible to debug the user program. Figure 1 shows the processing of the programmer service section of the peripheral tool services of the programmable controller when a stop address (breakpoint) is specified by the programmer in debug mode. 70- is shown. Now, when the programmer is in the debug mode, the programmer specifies the stop address and the sequence program contents at the specified address are saved, and when this saving is completed, the save 7 flag is stored.

Next, the contents of the sequence program at the saved address are rewritten into break instructions. To explain this process more specifically according to Figure 4, the original sequence program is as shown in Figure 4 (a), and the stop address is specified by the programmer as shown in Figure 4 (b). Then, the contents of the sequence program at the designated address are saved, and a save table shown in FIG. 2(c) is created. Now, when the saving of the sequence program contents at the specified address is completed, the saving flag becomes 1, a break instruction is written to the specified address of this sequence program, and the sequence program starts as shown in Section 4111(d). Can be rewritten. As a result, when you run this program, the program at the specified address has been changed to a break instruction, so
Transition to break state at that address. Note that at this time, the break flag is set to 1. In addition, when canceling the break state and continuing the program after the stop address, as shown in Figure 5, read the sequence program contents at the address where the break instruction was written from the save table and write them to the original address. , clear the break flag. Then, when the debug mode is set again, a break instruction is written again to the address restored last time. This makes it possible to enter a break state at the same address even in debug mode again.

Next, what to do when going from debug mode to run mode or stop mode, or when the power is turned on again after being turned off. ! Flow! @ Shown in Figure 6.

In this case, the save flag is determined, and if it is in the save state, the original program content is restored to the corresponding address while referring to the save table. Then, when the return processing is completed, the evacuation flag is cleared. By performing such processing, when migrating to another mode, a program that was rewritten to a break instruction in debug mode will be automatically restored without the user having to press any keys, and will not affect other modes at all. You can avoid giving it.

(Example 2) FIG. 7 and FIG. f58 show other embodiments of the present invention.

In the first embodiment described above, a breakpoint is set at an arbitrary address, and debugging is performed by executing the sequence program up to this breakpoint, but in this embodiment, the sequence program is executed in units of one instruction. This allows you to debug the program by executing it step by step.

FIG. 7 shows the processing flow of the peripheral tool service section during step execution. This one-instruction execution process 70- will be explained according to the specific processing operation shown in FIG.

First, check the save flag, and if the program contents have already been saved as shown in FIG. 8(a),
Restore its contents, find the next address of the current program counter, save the program contents at that address, and save j! The L7 lag is set, a break instruction is written to the next address, and the break flag is cleared, as shown in FIG. 8(b). FIG. 8(c) shows a case where the above-described processing is further performed for the next address. Through such processing, execution in units of one step can be realized. According to this embodiment, a CP dedicated to bit operations
Regarding programmable controllers using U,
@w Since there is no need for a dedicated circuit for 1# current execution within the CPU, the cost is low.

[Effect of the Invention 1] As described above, the present invention includes a system ROM in which a system control program is stored and a RAM for storing user programs backed up by a battery. '? O
CPU based on the program stored in M and RAM.
In a programmable controller that performs automatic control of equipment by restoring operations, has an instruction dedicated to stopping calculations in the user program code, and has a mode dedicated to debugging in addition to execution and stopping, the above-mentioned debugging-only mode , the calculation stop d− registered by the programmer
A saving means that saves the program contents at the address of desired address Q; onto memory and sets a flag to remember that the contents have been saved; a rewriting means that rewrites the contents of the registered address into a break instruction; and a debug mode. This system is equipped with a return means that automatically writes the saved program contents to the original address and returns to the original program state when the program transitions to execution or stop mode. By specifying only an arbitrary address without writing, the save means saves the program contents of the registered address into memory, and the rewrite means rewrites the contents of the registered address with a break instruction. , stop operation l
: Conditions can be set, and a break instruction set in this way automatically writes the saved program contents to the original address using the return means when executing or transitioning to program mode. By returning to the original program state, the break instruction is automatically deleted, eliminating the need for the user to delete the break instruction, and thus making it possible to efficiently debug the user program. be.

[Brief explanation of the drawing]

FIG. 1 is a process 70-chart of the programmer service section according to an embodiment of the present invention, FIG. 2 is a schematic configuration diagram of the programmable controller as described above, and FIG. 3 is a basic process 70-chart as described above.
The charts, Figures 4(a) to 4(d) are diagrams of the processing flow of the programmer service department (explanatory diagram of the physical program processing), and Figure 5 is the processing 70 when the operation stop state is released.
-Chart, Figure 6 is a processing flowchart at the end of debugging, etc., Figure 7 is a processing flowchart of step execution, and Figures 8 (,) to (c) are explanatory diagrams of specific program processing of one instruction execution. be. 1 is a CPU, 2 is a ROM, and 3 is a RAM. Agent Patent Attorney Ishi 1) 艮 7 (b) M 1 (Kakei "t, r 111 boi attos (C) Professional 2 program retirement 517-fil

Claims (1)

[Claims] (1) Equipped with a system ROM that stores system control programs and a battery-backed RAM for storing user programs, the CPU performs arithmetic processing based on the programs stored in the ROM and RAM to automatically control the equipment. In a programmable controller that performs control and has an instruction dedicated to stopping calculations in the user program code, and also has a debug-only mode in addition to execution and stop, in the debug-only mode, an arbitrary command registered by the programmer that the programmer wants to stop. A saving means that saves the program contents at the address in the memory and sets a flag to remember that it has been saved, a rewriting means that rewrites the contents of the registered address to a break instruction, and an execution mode or a stop mode from the debug mode. A programmable controller comprising a return means for automatically writing saved program contents to the original address and returning to the original program state when the program is moved to the original program state.