JPH01292402A - Signal referencing system for pc device - Google Patents

Abstract

PURPOSE:To make it unnecessary to retrieving and changing all instructions at the time of changing the address of a signal to be used by storing the addresses of a register memory in stead of storing the addresses of signals directly in a user program memory in a PC device. CONSTITUTION:The addresses of the register memory 14 are stored in stead of storing the addresses of signals directly in the user program memory 10 in the PC device. At the time of interpreting and executing a program in each step, a CPU 2 refers a bit constituting an addressing mode part at first, and when the bit is '0', uses a signal having an address stored in an address part in an instruction for operation. At the time of '1', the CPU 2 refers the contents of the register 14 having the address stored in the address part of the instruction to use a signal defining the value stored in the register 14 as an address for operation.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a programmable controller (hereinafter referred to as a PC), and in particular, the present invention relates to a programmable controller (hereinafter referred to as a PC), and in particular, a system that inputs the status of relays and coils of a machine tool as signals to a PC and performs calculations according to a program. , PC signal reference system that outputs the calculation results to control the machine tool [Prior art] In the conventional PC-based machine tool control method, external signals corresponding to the states of relays and coils are input. Connect the signal lines to the input and output signal terminals of the PC for output,
These signals are referenced according to the program. In a program, when referring to these signals, use symbols that have a one-to-one correspondence with the signal terminals, such as symbol 11 for input terminal 1 and symbol Q1 for output terminal 1. Referring to.

[Problem to be solved by the invention]

However, these conventional methods cannot easily accommodate even the small changes that are often required during system development and maintenance, i.e., when only one terminal to which a signal is connected is changed. In order to do this, one must search through all the instructions in the program and change many instructions.

For example, it is necessary to change all symbols 11 in the program to ■2. If the program is stored in a ROM, it takes a lot of effort to change it, and it is especially difficult to change it on-site.

The present invention has been made in view of these problems, and it is an object of the present invention to provide a PC signal reference system that improves flexibility in creating and changing user programs.

[Means to solve the problem]

In order to solve the above-mentioned problems, the present invention provides a signal reference method of a PC device that refers to input/output signals and internal relay signals of a PC (programmable controller) device. A program consisting of an instruction code including an address section indicating the address of the relay or coil to be referenced and an addressing mode section indicating the mode of reference is stored in a memory, and the program is sequentially read from the memory, and the addressing of the read program is If the mode section specifies direct reference, the relay or coil specified by the address section in the instruction code is used for calculation, and if the addressing mode section specifies indirect reference, the relay or coil specified by the address section in the instruction code is used for calculation. A signal reference method for a PC device is provided, characterized in that a register indicated by an address part is referenced and a relay or coil indicated by a value stored in the referenced register is used for calculation.

The PC may be a PC built into an NC device,
Alternatively, it may be a stand-alone PC.

[Effect]

When a PC's microprocessor (hereinafter referred to as CPU) interprets and executes a program step by step, it first
Whether the bits forming the addressing mode part are 1 or
Check whether it is 0.

For example, if the bit is 0, a signal having the address stored in the address field of the instruction is used for calculation, and if the bit is 1, the signal has the address stored in the address field of the instruction. The contents of the register are referenced and a signal whose address is the value stored in this register is used for calculation.

〔Example〕

Hereinafter, one embodiment of the present invention will be described based on the drawings.

FIG. 1 is a hardware block diagram that implements a signal reference method of a PC device according to the present invention.

PCI includes CPU2, input circuit 3, output circuit 4, and ROM.
5, RAM 6, and program creation device interface 7
A system program 9 is stored in the ROM 5, which includes a bus 8 and a bus 8. The RAM 6 is backed up by a battery and is used as a user program memory 10, an input relay memory 11, an output relay memory 12, an internal relay memory 13, and a register memory 14.

The program creation device 15 has a liquid crystal display device 16 and a keyboard 17, and is connected to the interface 7.

FIG. 2 shows the structure of the instruction code of the user program.

The user program memory 10 has a configuration unit of 16 bits.
Each word corresponds to one step of the instruction. As is clear from FIG. 2, the structure of an l word representing an instruction step consists of a 4-bit operation field, a 1-bit addressing mode field, and an 11-bit address field.

When the addressing mode section is 0, the signal in the address section is directly referenced, and when it is 1, the contents of the register specified by the address section are referenced.

FIG. 3 shows a code table showing the types of instructions corresponding to the 4 bits of the operation section.

Figure 4 shows a code table showing details of the address part.
The address field indicates the address of data used in the calculation, the upper 2 bits indicate the type of memory to be referenced, and the lower 9 bits indicate the bit number.

FIG. 5 shows an example of a user program, in which addresses 0 to 2 are all direct reference instructions since their addressing mode sections are 0.

On the other hand, since the addressing mode part of addresses 3 to 5 is 1, they are all indirect address instruction instructions.For example, the contents of register R1 are 1, the contents of register R2 are 2, and so on. , the contents of register R3 are 2, then the instructions from address 3 to address 5 are ! Q the AND of the signal 1 and the signal 2
2 shows what should be output.

Here, output to Q2! If it becomes necessary to change the logical product of signal 3 and signal 4, change the contents of register R1 from 1 to 3, and change the contents of register R2 from 2 to 4. Even if the same signal is referenced in multiple steps, there is no need to change the program, and only the register memory 14 needs to be changed.

Further, for example, if counter data is input to the register memory 14, the signals read out during program execution can be changed by indirectly referencing the register memory 14.

Although a liquid crystal was used as the display device 16 in this embodiment,
A CRT display device may also be used.

〔Effect of the invention〕

As explained above, in the present invention, instead of directly storing the signal address in the user program memory of the PC device, the address of the register memory is stored, and the signal used for the calculation is determined based on the read contents of the register memory. Since the configuration is such that the address can be determined, there is no need to search and change all instructions when changing the address of the signal to be used, and it is only necessary to change the contents of the corresponding register memory.

Furthermore, by inputting counter data and the like to the register memory, it is possible to change the readout signal during program execution.

Therefore, flexibility in creating and changing user programs can be greatly improved.

[Brief explanation of the drawing]

Fig. 1 is a block diagram of hardware for implementing the signal reference method of the PC device of the present invention, Fig. 2 is a diagram showing the instruction code configuration of the user program, and Fig. 3 shows the types of instructions corresponding to the operation section. FIG. 4 is a code table for the address section, and FIG. 5 is an example of a user program. １−−１−−・−−−−−−−・−・Programmable・
Controller 2 -------------- Microprocessor 3 ----------- Input circuit 4--
−−1−−−−・・Output circuit 5・・−・・−・・
-------・ROM6-------------・-・R
AM 7・−・−・−・−・Program creation device interface 8・・・−−m−−・・−・−Bus 9−・・−・−・−−−−−−System program 10.---------------m--User program 11--1.・-Output relay memory 1
3・-m−−・−−−−−・−Internal relay memory 14−
・・−・−−−−−−−1−・Register memory 15・−
・−・−・−・−Program creation device 16−・−・−・
−・Liquid crystal display device 17−・−・−・・−・−・Keyboard Patent applicant Fanuc Co., Ltd. Agent Patent attorney Takeshi Hattori Figure 1 Figure 2 Figure 3

Claims (3)

[Claims] (1) In the signal reference method of a PC device that refers to input/output signals and internal relay signals of a PC (programmable controller) device, an operation section indicating the type of instruction and an address indicating the address of the relay or coil referred to by the instruction A program consisting of an instruction code including a section and an addressing mode section instructing the mode of reference is stored in a memory, the program is sequentially read from the memory, and the addressing mode section of the read program instructs direct reference. If the addressing mode section indicates indirect reference, the relay or coil indicated by the address section in the instruction code is used for calculation, and the register indicated by the address section in the instruction code is referenced. A signal reference method for a PC device, characterized in that a relay or coil pointed to by a value stored in a referenced register is used for calculation. (2) A signal reference system for a PC device according to claim 1, wherein the PC is a PC built into an NC device. (3) A signal reference system for a PC device according to claim 1, wherein the PC is an independent PC.