JPS6155767A - Input output bus connection change-over device - Google Patents

Abstract

PURPOSE:To attain I/O bus connection change-over of a load sharing mutual back-up system with simple construction by providing plural switch parts, a manual changing-over means and an automatic changing-over means, and changing over switchs in accordance with a trouble generating condition. CONSTITUTION:When a processor 1a is at fault, an automatic changing-over means 5 detects the trouble and connects a switch part 3a to a side (b). Thus, respective I/O ports 2a and 2b are connected to a processor 1b. When the processor 1b is at fault, the means 5 detects this fault and connects a switch 3b to a side (a). Thus, I/O ports 2a and 2b are connected to the processor 1a. A manual changing-over switch 4 is connected to a C terminal at the time of automatic changing-over and when the processor 1a or 1b is selected manually, a manual knob 40 is turned to a side A or B, connected and changed over. In such a way, by providing the means 4 and 5 and switches 3a and 3b, I/O bus connection changeover of a load sharing mutual back-up system can be attained with simple construction.

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to an input/output system (hereinafter referred to as 170) in a system with a highly reliable configuration by duplicating processors.
This invention relates to a bus connection switching device. For more details,
The present invention has the following features: 1. a second processor; second I
Normally, it operates by connecting the first processor and the first VO boat, and the second processor and the second VO boat. 2 processors and the first . A second I10 boat is connected, and if the second processor fails,
a first processor; This invention relates to a so-called load share mutual backup type bus connection switching device that connects a second I10 boat.

(Prior Art) Duplex control compatible with standby backup has been considered in the past, but there has been no load sharing mutual backup backup bus connection switching device up to now. In the standby system, only one bus is allowed to control the I10 bus at any given time, so a load sharing system cannot be used.

(Problems to be Solved by the Invention) The present invention has been made in view of the problems that plague the prior art, and its purpose is to provide I10 bus connection switching using a load sharing mutual backup method with a simple configuration. outfit ff
This is what we are trying to achieve.

(Means for Solving the Problems) The configuration of the present invention for achieving such objective t- is as follows. a second processor; a second input/output port, a first switch section for switching bus connections between the first input/output port and the first and second processors; a second input/output port and the first switch section; a second switch section for switching the bus connection to the second processor; manual switching means for manually switching the second switch; and a manual switching means for manually switching the second switch; It is determined whether the second processor is normal or abnormal, and if the respective processors are normal, the first input/output port is connected to the first processor side, and the second input/output port is connected to the second processor. At the same time as turning off the second switch, the first switch is turned off. If either one of the second processors becomes abnormal, the first and second input/output ports are both connected to the normal processor. It is characterized in that it includes automatic switching means for switching the second switch.

(Example) Summary 1 is a diagram showing an example of the configuration of an apparatus according to the present invention. In this figure, 1a is a first processor;
11) is the second processor, 2sho is the first X10 port, 2b is the second VO port, 3a is each processor and I
10 boats, the first I10 port 2 and the first I10 port. The first switch section 3b switches the bus connection with the second processors 1m and 1b, and the X1
0 po) 2b 7th 1. This is a second switch section that performs bus connection switching with the second processor 1ajb. 4 is the first. Manual switching means for manually switching the second switch portions 5m and 5b 1; It has a means for monitoring whether the operation of each of the second processors 1ajb is normal or abnormal, and if one of the processors is determined to be abnormal, the processor that is operating normally is replaced with the first processor. second I1
0ho) so that both 1m and 1b are connected.
゜Second switch section 5m, 5b There is an automatic switching means for switching f.

The operation of the apparatus configured as described above will be explained next.

Usually, the first. When the processors 1i and lb of g2 are operating normally, the first and second switch sections 3 and 3 of the i first and second switch sections 1b and 1b of g2 are in normal operation.

5b are both connected to the 1 side, and the first processor 1
The bus from
each connected.

Now, if the first processor 1a fails, the automatic switching means 5 detects this failure and switches the first switch section 3a to b.
side (the connection of the second switch part 5b is 11)
). As a result, each I hub (2m, 2b) is connected to the second processor 1b. Further, when the second processor 1b fails, the automatic switching means 5 detects this and switches
It is connected to the switch section 5bt-b@ of L2 (the first switch section 3a is connected until then).

2b is thereby connected to each I10 port 2 of the first processor 1aK.

By such an operation, switching of the x10 bus connection in the load sharing mutual backup method is performed.

In addition, 1. If both of the second processors become abnormal, the 11th and 2nd switch sections 3m and 5b will be damaged.
connected to the side.

In addition, when the manual switching switch 25 is blind, it is connected to the Ci when switching automatically, but if you want to manually select the first or second processor, operate the manual knob 40 to the A side or B side to connect. Perform switching.

Figure 2 shows the 1. It is a time chart which shows the above-mentioned operation of a 2nd switch part.

In addition, in FIG. 1, 1. Second switch section 3.

Although an example has been shown in which the switching of 3b is performed by excitation of a coil, it may be realized using other components such as a logic element or a switch element.

(Effects of the Present Invention) As described above, according to the present invention, an I10 bus connection switching device of load sharing mutual backup type can be realized with a simple configuration.

[Brief explanation of drawings]

FIG. 1 is a configuration block diagram showing an example of the device according to the present invention, and FIG. 2 is a time chart showing an example of its operation. 1. 1b・-Process, Su, 2m, 2b-I
10 boats, 3m. 3b...Switch section, 4...Manual switching means, 5...
・Automatic switching means.

Claims (1)

[Claims] (1) A first switch that switches bus connections between first and second processors, first and second input/output ports, and between the first input/output port and the first and second processors. a second switch unit for switching bus connections between the second input/output port and the first and second processors; and a manual switching unit for manually switching the first and second switches. Then, it is determined whether the first and second processors are normal or abnormal, and if each of the processors is normal, the first processor is
The first input/output port is connected to the first processor and the second input/output port is connected to the second processor, respectively.
, the second switch is switched, and the first and second input/output ports are both connected to a normal processor if either the first or second processor becomes abnormal. An input/output bus connection switching device comprising automatic switching means for switching first and second switches.