JPH01145758A - Time synchronizing system for multisystem computer system - Google Patents

Abstract

PURPOSE:To synchronize multisystem computer without generating a synchronizing request signal from each microcomputer by constituting the system so that plural computers are synchronized in a prescribed period at every loop program processing, based on a synchronizing signal of a synchronization use computer. CONSTITUTION:In a multisystem computer system which is provided with plural sets of computers 1, 2 and 3 and executes the same loop program, a synchronization processing use computer 4 is provided so that these computers 1, 2 and 3 can execute a synchronization processing of a prescribed period, and based on a synchronizing signal of this synchronization processing use computer 4, plural computers 1, 2 and 3 are synchronized at every loop program processing, and also, its loop program processing can be executed in a prescribed period. In such a way, the multisystem computer system can be synchronized without generating a synchronization request signal from each microcomputer 1, 2 and 3.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] This invention relates to time synchronization in a plant system using a plurality of microcomputers.

[Conventional technology]

FIG. 8 is a diagram showing a conventional multi-system computer system disclosed in, for example, Japanese Unexamined Patent Publication No. 57-13565.

In the figure, (4) is a synchronization signal generator (LL)
12) (3) is a microcomputer.

Next, the operation will be explained. Microcomputer +1
From 1, (2), and (3), the synchronization request signal qυ,c
! υ, on are input, and based on these, synchronous interrupt signals (6), s, - are output to the microcomputer ill, +21, (3).

[Problem that the invention seeks to solve]

Since the conventional synchronization method is configured as described above, synchronization request signals from microcomputers +1), +2), and (3) must be input, and synchronization interrupt signals must be output to each microcomputer. Because of this, there were problems such as the execution cycle of each microcomputer's one-round program was not constant.

The present invention was made to solve the above-mentioned problems, and an object of the present invention is to provide a computer system in which a plurality of computers can be synchronized at a constant cycle without generating an interrupt signal.

[Means for solving problems]

A computer system according to the present invention has a plurality of computers and is provided with a synchronous processing computer so that these computers can perform synchronous processing at a constant cycle in a multi-system computer system that executes the same one-round program. A plurality of computers are synchronized for each round of program processing based on a synchronization signal of the computers, and the round of program processing can be performed at a constant cycle.

[Effect]

The computer system in this invention is comprised of a synchronous processing computer, a plurality of microcomputers that perform synchronous processing with the computer, and a transmission path for transmitting synchronous signals.

[Embodiments of the invention] An embodiment of the present invention will be described below with reference to the drawings.

In Fig. 1, (4) is a synchronization signal generator, (υ
.

+21, (3) are microcomputers that repeatedly execute the same program processing, (5) are microcomputers (1), (2), (3) that use synchronization signals.
It is a transmission line for sending to.

The synchronization signal generator (4) has a built-in microcomputer and is processed to transmit synchronization signals at regular intervals.

The synchronization signals (6), i4a, and a do not receive synchronization request signals from the microcomputer (υ, +21, (3)), and are always transmitted by the synchronization signal generator at a constant cycle.

Assume now that power is supplied to the microcomputer and the synchronization signal generator, and processing has started. The microcomputers (1), (2), and (3) perform the initialization process συ shown in the flowchart of FIG. 5, and the synchronization signal generator (4) performs the initialization process (2) of the flowchart shown in FIG. This initialize Kamo Soku is
This is a process normally performed in a microcomputer system, such as clearing the memory inside the microcomputer. The synchronization signal generation bag @ (4) is a timer (6) that determines the execution cycle of the one-round program when the initialization process (2) is completed.
) so that this system operates at a constant cycle.

The synchronization signal generator (4) periodically generates a synchronization signal to each microcomputer (υ, (2)) based on a timer.

(3) Send to. When the initialization process (2) in the flowchart of FIG. 5 is completed, each microcomputer waits for a synchronization signal to be transmitted from the synchronization signal generator t (4). As soon as it is sent, the timer is reset and the round program is executed.

- Check that the cycle time is reached at the end of the cycle program, and wait for the synchronization signal to be sent from the synchronization signal generation bag @(4).

As described above, in this computer system, multiple computers can be synchronized without generating synchronization request signals from each of the microcomputers (1), (2), and (3).

In the above embodiment, the synchronizing signal generating bag A (4) and the transmission line (5) have a single configuration, but they may also have a double configuration as shown in FIG.

By adopting a duplex configuration, there are two synchronous signal generators, so even if one synchronous signal generator is lost, the synchronous signal can still be transmitted to the microcomputer u), +2).
, (3), providing a more reliable synchronization method.

〔Effect of the invention〕

As described above, according to the present invention, a multi-system computer system can be synchronized using a synchronization generation signal without requiring a synchronization signal request signal from each microcomputer.

[Brief explanation of the drawing]

FIG. 1 is a configuration diagram of a computer system according to an embodiment of the present invention, FIG. 2 is a configuration diagram of a computer system showing another embodiment of the invention, and FIG. 8 is a configuration diagram of a conventional computer system. FIG. 4 is a flowchart of a program that performs synchronization processing of the synchronization signal generator, and FIG. 5 is a flowchart showing a synchronization method of a microcomputer that performs synchronization processing based on the synchronization signal. +13, (
21, (3) is a microcomputer that repeatedly executes a program based on JEU (No. 8), (4) is a synchronizing signal generator, (5) is a synchronizing signal transmission line, and (6) is a timer. Note that the same reference numerals in the figures indicate the same or equivalent parts.

Claims (2)

[Claims] (1) In a multi-system computer system that has multiple computers and executes the same one-round program, a synchronous processing computer is provided so that these computers can perform synchronous processing, and multiple computers are A time synchronization method for a multi-system computer system, characterized in that the computers of the computer are synchronized at a constant cycle for each round of program processing. (2) A time synchronization method for a multi-system computer system, characterized in that two synchronization computers are installed and both generate synchronization signals, thereby achieving more reliable synchronization.