JPH01114906A - Jump control system for pc - Google Patents

Abstract

PURPOSE:To attain plural jumping operation only by one instruction providing a jump instruction with a program having parameters of a program to be jumped in a jump control system for executing ladder programs and selecting one of the parameters in the table in accordance with a logical condition to execute the jumping operation. CONSTITUTION:Plural ladder-like stages constituted of connecting contacts A-H for executing a jump instruction to coils D300.0-D300.7 in series are connected between a side for outputting program function commands and programs to be jumped. On the other hand, a contact ACT is formed independently of said contacts A-H, and when the contact ACT is turned on, an address 11 for determining the condition of a program to be jumped is generated and one of the conditions of the coils D300.0-D300.7 is selected to determined the program to be jumped. Namely, functional instructions 20-27 indicating the programs to be jumped are arranged between the side for outputting the functional instructions and the programs to be jumped and respective coils are excited based on the operation of the ladder type contacts A-H to activate plural instructions stored in the corresponding instructions 20-27.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a jump control method for a PC that performs arithmetic processing of a ladder program, and particularly to a jump control method for a PC that allows jumping to a plurality of jump destinations.

[Conventional technology]

In PCs (programmable controllers), a program called a ladder program that uses relay contacts and coils is widely used. Since relay coils and contacts alone cannot process complex functions, special commands are issued as functional commands, which are then decoded and executed by a microprocessor.

A jump instruction is used as a functional instruction in a ladder program, but this instruction is a jump instruction.
It is composed of a pair of instructions, UMPJ and rJUNPEJ indicating the jump destination, and is configured to jump to ``JUMPEJ'' when there is a ``JUNPEJ'' instruction.

[Problem that the invention seeks to solve]

However, with conventional jump commands, you can only jump to one jump destination with one jump command, and if you want to jump to multiple jump destinations depending on the conditions, you must issue a combination of multiple jump commands. There was a problem that creating a ladder program was complicated.

The purpose of the present invention is to solve the above-mentioned problems and to provide a PC that can jump to multiple jump destinations with a single jump command.
The purpose of this invention is to provide a jump control method.

[Means for solving problems]

In order to solve the above-mentioned problems, the present invention provides a jump command that has a table with multiple jump destinations as parameters in the jump control method of a PC (programmable controller) that executes a ladder program. , a jump control method for a PC is provided, which is characterized by: selecting a parameter in the table, and jumping to a jump destination indicated by the selected parameter.

[Effect]

Depending on other logical conditions, a parameter in the table is selected and a jump is made to the jump destination indicated by the selected parameter.

Therefore, it is possible to control jumps to a plurality of jump destinations with one command.

〔Example〕

An embodiment of the present invention will be described below based on the drawings.

FIG. 1 shows a ladder program for a PC jump control system according to an embodiment of the present invention. In the figure, A, B, C...
---------H is a contact, and D300°0 to D300.7 are coils.

ACT is a contact, and when this contact is on, a jump instruction is executed. Reference numeral 10 indicates a function instruction indicating a jump instruction, and reference numeral 11 indicates an address that determines the conditions of the jump destination. Here, it is shown that the jump destination is selected according to the conditions of coils D300 and O to D300.7.

20.21 to 27 are function commands indicating jump destinations.

For example, when contact A is on, coil D300.
0 turns on and jumps to JUMPEO (20).

Similarly, when contact B is on, coil D300.1 is turned on and jumps to JUMP1 (21). below,
The same applies.

FIG. 2 shows the contents of address D300.

Address D300 consists of 8 bits, and each bit is D300.01D300°1 to D300 from the right.
．． This corresponds to 7 coils. The figure shows a state in which the coil D300.1 is turned on and the second bit from the right of address D300 is 'IJ'.

FIG. 3 shows a table for selecting a jump destination.

In the figure, 31 is the jump destination number, which corresponds to the number 'JUMEJ' in FIG. 1, which coincides with each bit number of address 300. 32 is the address of this jump destination.

In the example of FIG. 2, coil D300.1 is on, the corresponding jump destination 'JUMPIJ' is selected, and address 1 is selected. To execute a jump instruction, calculate the relative address between address 1 and the address where the jump instruction is stored, and execute 'JUMPIJ, that is, jump to address 1.

In the above explanation, an example of jumping to multiple jump destinations with one jump instruction was shown, but by sharing the jump destination, it is also possible to control jumping to multiple jump destinations from multiple jump instructions. You can also do it.

FIG. 4 shows a hardware configuration diagram of a PC (programmable controller) for implementing the present invention. In the figure, 1 is a microprocessor, which controls the entire PC. 2 is a periodic signal generation circuit that generates an interrupt signal at regular intervals.

In response to this interrupt signal, the microprocessor 1 executes various interrupt instructions. A ROM 3 stores a management program and a ladder program, and the microprocessor 1 executes the ladder program under the management of the management program in the ROM 3 to control the PC. 4 is a work RAM in which various data and the like are stored. 5 is RA
M, and stores data such as parameters that should be stored even after the power is turned off. The RAM 5 is backed up by a battery 6 so that parameters and the like can be retained even when the power is turned off. 7 is an input circuit;
It has a receiver circuit that receives an input signal from an external device such as a machine, and allows the input signal to be read by the microprocessor through a bus.

8 is an output circuit, which outputs an output signal for operating a machine or the like.

〔Effect of the invention〕

As explained above, in the present invention, a jump instruction, which is a functional instruction in a ladder program, has a team having a jump destination parameter, and depending on logical conditions,
Since it is now possible to jump to multiple locations, creating ladder programs becomes simpler.

[Brief explanation of the drawing]

Fig. 1 is a diagram showing a ladder program for a PC jump control method according to an embodiment of the present invention, Fig. 2 is a diagram showing the contents of an address that determines a jump destination, and Fig. 3 is a diagram showing a table for selecting a jump destination. FIG. 4 is a configuration diagram of the hardware of a PC for implementing the present invention. 1-・--1-----------Microprocessor 2
−−−−−−−・−1−−−−・Periodic signal generation circuit 3−
−−−−−−−・−・・・・・ROM4−・−・−1−
---RAM 5----------------- RAM7--
−−−−−−・−Input circuit 8−−−−−−−−−−
1--Output circuit 10--Jump instruction 11-----Eeeee--Address 31 indicating jump condition----- -- Jump destination number 32 --- Jump destination address Patent applicant FANUC Co., Ltd. Representative Patent attorney Takeshi Hattori Figure 1 Figure 3 Figure 4.

Claims (1)

[Claims] (1) In the jump control method of a PC (programmable controller) that executes a ladder program, a jump command is provided that has a table with multiple jump destinations as parameters, and parameters in the table are selected according to logical conditions, and the corresponding A PC jump control method characterized by jumping to a jump destination indicated by a selected parameter.