JP2767818B2 - Sequencer numerical simulation operation method - Google Patents

Description

The present invention relates to a numerical simulation operation method of a sequencer.

B. Summary of the Invention In the present invention, in a numerical simulation method of a sequencer, in order to realize a numerical lock function, a numerical compulsory input / output instruction is set, and the numerical compulsory input / output instruction and the original numerical instruction are numerically input. A number indicating the storage location is added and stored in the output table, and the original numerical instruction is executed when the numerical forced input / output instruction is executed, so that numerical operations can be performed using data other than sudden input. It was done.

C. Conventional technology The sequence controller is provided with a lock function (hereinafter referred to as “forced input / output function”) for the purpose of user program testing and maintenance.This lock function is mainly for bit data. No lock function has been realized for numerical data.
Recently, the number of sequence controllers that can handle numerical instructions has increased, and the necessity of performing the numerical lock function for user program testing has increased. For example, the third
In the relay ladder diagram shown in the figure, when performing a memory operation,
A: [RD (load)], B: [+ (addition)], C [WT (register-to-table transfer instruction)], the contents of the memory are locked to a lock value (hereinafter referred to as a forced input output value). ) When you want to calculate.

Also, in the relay ladder diagram of FIG. 4, when performing a constant operation, it is desired to perform the operation by setting the constant values #A and #B of #A [RD] and #B [+] as lock values.

D. Problems to be Solved by the Invention In performing the above-described operations, there has been a Disable function as an alternative to a numerical lock. This Disab
The le function does not execute the specified instruction. However, this Disable function has a problem that it is not possible to perform an operation while fixing a numerical value to a certain value (this is simply that no operation is performed).

SUMMARY OF THE INVENTION It is an object of the present invention to provide a method of simulating a numerical value of a sequencer in which a numerical value can be calculated using data other than the sudden input by employing a numerical value lock function.

E. Means and Action for Solving the Problems The present invention relates to a sequencer having a lock function used at the time of testing and maintenance of a sequence controller. Set and store the numeric command and the numeric forced input / output instruction in the numeric forced input / output table with the number indicating the storage location, and then perform a sequence operation to execute the numeric forced input / output instruction. The numerical instructions are executed.

F. Embodiment An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a relay ladder diagram showing a program for writing the result of adding the contents of the word address "A" and the contents of the word address "B" to the word address "C". Since it is handled, it is called a numerical instruction which is one of the operation instructions. The forcible numerical input / output instruction is an instruction used to forcibly input / output a numerical instruction. By replacing the numerical instructions with the numerical forced input / output instructions, the forced input / output processing of numerical values is realized.

The procedure of this numerical forced input / output processing (hereinafter referred to as numerical lock processing) will be described. The relay ladder diagram shown in FIG. 1 is stored in a memory (not shown) as a program before a numerical value lock process. Here, when the second instruction (#B) is subjected to the numerical lock processing, #B in the memory is replaced with a numerical forced input / output (numeric lock) instruction. The numerical lock instruction is stored in a numerical lock table. In order to realize this forced input / output processing (input / output function), a numerical input / output command is set and processing is performed in the following procedure.

First, a numerical lock table shown in FIG. 2 is created in accordance with the user's specification, and the original instruction A [R
D], #B [+], C [WT] and the respective lock values are numbered and stored as follows. Next, the instruction specified by the user is changed to a numerical lock instruction, and a number indicating a corresponding address of the numerical lock table is set in the numerical lock instruction. Thereafter, a sequence operation is performed, and a numerical value lock instruction is executed. In the numerical lock instruction, the numerical lock processing is performed according to the original numerical instruction and the lock value stored in the numerical lock table.

The second instruction (#B) in the relay ladder diagram shown in FIG.
Is described below. Here, it is assumed that the user of the numerical lock wants to execute the operation by setting B of the word address indicated by this instruction to a designated value (lock value).
In this case, if the word address B is changed to the lock value before the operation and the operation is performed as it is, the forced input / output operation considered by the user can be realized. However, if another ladder diagram exists before executing the relay ladder diagram of FIG. 1, the contents of the word address B will be different from the lock value when executing FIG.

To avoid this problem, the lock value stored in the numerical lock table is first written to the word address B when executing the numerical lock instruction of the present invention. With this alone, the operation of the second instruction #B has not been performed, so that it can be realized by executing the original numerical instruction stored in the numerical lock table. This is referred to as reproducing and executing the original numerical command.

 The following processing is performed by the numerical value lock instruction.

(1) If the operand of the original numerical instruction is a memory, the designated lock data is stored in the memory, and the original numerical instruction is reproduced and executed. (Memory lock) (2) If the operand of the original instruction is a constant, the operand of the original instruction is set to a specified lock value, and the instruction is executed. (Constant Lock) G. Effect of the Invention As described above, according to the present invention, by providing a numerical value lock function, an analog input from the outside can be simulated, and thereby, a numerical value can be obtained using data other than the actual input. Calculation becomes possible. In addition, the specified analog amount can be output to the outside irrespective of the calculation result in the middle. These functions enable efficient testing of the user program.

[Brief description of the drawings]

FIG. 1 is a relay ladder diagram showing an embodiment of the present invention, FIG. 2 is an explanatory diagram of a numerical lock table, and FIGS. 3 and 4 are relay ladder diagrams for explaining a conventional example. A: Load [RD], #B: Constant, C: Transfer instruction.

Continuation of the front page (58) Field surveyed (Int.Cl. ⁶ , DB name) G05B 19/05 G05B 23/02 G06F 9/32 G06F 12/14

Claims (1)

(57) [Claims] 1. A sequencer having a forced input / output function used at the time of a test or maintenance of a sequence controller, wherein a numeric forced input / output command is set for a numeric command which is one of operation instructions and a numeric forced input / output is set. The numerical instruction and the numerical forced input / output instruction are stored in the table with the number indicating the storage location, and then the sequence operation is performed,
A numerical simulation method for a sequencer, wherein the numerical instruction is executed when the numerical compulsory input / output instruction is executed.