JPS6316781B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Application of the Invention] The present invention relates to a switching device for transmission lines between computers having an upper multi-configuration and a lower-level distributed configuration.

[Background of the invention]

Conventional switching devices connect the transmission lines all at once to the main system of the host computer system. For this reason,
When the lower-level computers were configured in a distributed configuration, there was a drawback that each distributed computer could not be selectively connected to the main system or slave system of the upper-level multi-computer system.

[Purpose of the invention]

SUMMARY OF THE INVENTION An object of the present invention is to provide a device in which lower-level computers in a distributed configuration can be connected to any computer side of a higher-level multi-computer system.

[Summary of the invention]

The main point of this invention is that the upper multi-computer system uses the WDT as computer down information for each computer.
Then, each lower-level computer outputs the DO1 bit as individual connection information for multiple lower-level computers, and each lower-level computer determines whether the ADD condition is satisfied between this WDT and the DO corresponding to its own computer. The computer is connected to the host computer via an intercomputer transmission line switching device that switches the transmission line.

[Embodiments of the invention]

The present invention will be explained below with reference to FIGS. 1 to 5.

Figure 1 shows a switching device, and the upper computer system is a duplex multi-computer system consisting of an A-system computer 1 and a B-system computer 2, and both the A-system and B-system have multiple lower-order computers 10, 20.
Inter-computer transmission lines 3 and 4 that transmit information with
And, as each computer down information, watchdog timer (WDT) 5, 6 is sent to the lower computer all at once.
Digital output (DO) 7, 8 of the process input/output device as individual connection information corresponding to the lower-level computer
It is equipped with The inter-computer transmission line is connected to each computer on the lower side via transmission line switching devices 11 and 21, and is an AND between WDT5, 6 and DO7, 8 output from the upper side computers A system and B system.
If the condition is satisfied, the A-system or B-system transmission line is connected, and if the condition is not satisfied, a neutral state is established.

FIGS. 2 and 3 are time charts of an example of the operation of the switching device. FIG. 2 shows a case where a lower-order computer is connected to the main computer of a higher-order multi-computer, and FIG. 3 shows a case where a lower-order computer is connected to a slave-side computer of a higher-order multi-computer. Both figures show that the A system of the host computer was started up as the main system and the B system as the slave system at time 100. At time 101, the A-system computer, which is the main system, goes down, and the B-system is switched to the main system. Time 102 indicates that the A system that went down has recovered and operates as a slave system, and the B system remains as the main system.
WDT is on when the computer is operating and off when the computer is down.

In Figure 2, the lower computer is connected to the upper computer on the main side, so turn on A system DO7 and
When DO8 is turned off, the conditions for system A, which is the main system, are met and connection is established. Next, when the A system goes down at time 101, the A system WDT 5 is turned off, the B system is switched to the main system by configuration control, and is connected to the B system by turning on the B system DO8. onwards,
At time 102, system A recovers from the down state and becomes a slave system, but remains connected to system B, which is the main system.

FIG. 3 shows an example in which a lower-level computer is connected to a subordinate higher-level computer to perform tasks such as testing. Time 1
At 00, the B system DO8, which is the slave system, is turned on, and the A system DO7, which is the main system, is turned off, so that the condition for the B system is established and the connection is established. Next, when the A system goes down at time 101, the configuration control is activated and the B system becomes the main system, so by turning off DO8, the condition is not satisfied for both the A system and the B system, and the switching device becomes the slave system. Since there is no one, the state is neutral. Next, when system A recovers to the slave system at time 102, DO
By turning on WDT 7 and WDT 5, the conditions are met, the switching device is connected to the slave system A, and operations such as testing are restored.

Next, the management of lower-level computers and the configuration control of the upper-level duplex type multi-computer system will be described with reference to FIG. The connection destination of the lower-level computer is the higher-level computer, and each lower-level computer is managed by the mode shown in the lower-level computer connection mode transition diagram in Figure 4a, and instructions for switching to this mode are determined and operated by humans. . The isolation mode is a mode in which the switching device is set to neutral without connecting the lower computer to any of the upper computers, and the slave connection mode is the mode in which the lower computer is connected to the upper slave computer, and the program Used during development and testing. The main system connection mode is a mode in which a lower-order computer is connected to an upper-layer main computer, and is a mode for normal online business. These three types of modes are associated with each lower-level computer, and are stored and managed in the shared memory of the higher-level computer.

The configuration control flowchart shown in Figure 4b is stored as a program in each higher-level computer, and is used when starting up the computer, when switching systems in duplex multi-systems (such as when switching from the slave system to the main system), and when the lower-level computer Operates when instructing to switch to connection mode.

At time 100 in FIGS. 2 and 3, the A-system computer is the main system and therefore executes the configuration control 50, and the B-system computer is the slave system and therefore executes the configuration control 51. next,
At time 101, the B system is switched from the slave system to the main system, so that the B system computer executes the configuration control 50. At time 102, since the A system is activated as a slave system, the configuration control 51 is executed on the A system computer. As described above, the DO to be output is determined by the state of the lower-level computer connection mode managed by the higher-level side and the configuration control, and the DO shown in the time charts in Figures 2 and 3 is determined.
7. Do the desired main system as per DO8.
Lower-level computers can be individually connected to subordinate computers.

In a duplex type multi-computer, each computer has a main mode, a slave mode, and a down mode, and normally operates in the main mode and the slave mode and performs mutual diagnosis. If an abnormality is detected in the main system, it will go down and
The slave system that was on standby switches to the main system and takes on the load.

Note that FIG. 5 is a correspondence table between the connection destination of the switching device and the output conditions of the host computer, and the connection destination of the switching device is determined by the conditions in this table output from the A system and B system.

Note that even if the lower-level computers 10 and 20 perform the same processing and operate as a dual-system multi-computer, the reliability of the lower-level computers improves with the same configuration as in the embodiment, and as shown in FIG. 3
If a plurality of lower-level computers are distributed and connected to the A, B, and C systems, the upper-level computers will operate as multi-computers in a load sharing system.

〔Effect of the invention〕

According to the present invention, lower level computers can be individually connected to any computer in the upper level multi-computer system.

[Brief explanation of the drawing]

Figure 1 is a system diagram of the transmission line switching device, Figure 2 is a time chart showing an example of connecting a lower-level computer to the upper-level computer of the main system, and Figure 3 is a diagram of connecting the lower-level computer to the higher-level computer of the slave system. Figure 4 is a transition diagram of the lower-level computer connection mode managed by the higher-level side, b is a flowchart of the configuration control of the upper-level duplex type multi-computer regarding the switching device, and Figure 5 is the connection destination of the switching device. The corresponding diagram, FIG. 6, is a system diagram of a modification of the present invention. 1, 2...Upper side multi-computer A system and B system,
3, 4... Inter-computer transmission line, 5, 6... Watchdog timer signal, 7, 8... PI/O digital output signal, 11, 21... Inter-computer transmission line switching device, 10, 20... ...lower side calculator,
50, 51, 52... Configuration control processing.

Claims (1)

[Claims] 1. A transmission line connecting a plurality of lower-level computers for each computer as an upper-level computer system, and digital output and computer operation information of a process input/output device having the same number of points as the lower-level computers. switching a multi-computer equipped with a watchdog timer and the plurality of transmission lines of the multi-computer;
In the switching device for determining the connection destination of the lower-level computer, for each lower-level computer, the digital output of the lower-level computer outputted from the multi-computer and the watchdog timer are connected to the side where an AND condition is satisfied. An inter-computer transmission line switching device characterized by connecting transmission lines.