JP2001186217A - Multiplexing control system having function for detecting disconnection of inter-system connecting part - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a system which can detect disconnection and in which a plurality of control systems can independently or simultaneously detect discon nection even in the case of the partial disconnection of an inter-bus for forming multiple system or the partial falling of the connection parts of the bus. SOLUTION: In this multiplexed control system connecting an A system control system 1 and a B system control system which are parallelly connected by the inter-system bus 3, signal lines 3a and 3b for disconnection detection are arranged between connection parts 4 and 5, disconnection detection circuits 7 and 9 that simultaneously detect the disconnection of each of the lines 3a and 3b are provided, data are also received through the bus 3, disconnection detection functioning parts 17 and 8 using software checking the soundness of the data are provided.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement in the reliability of a disconnection detection method for a connection between systems in a multiplex control system.

[0002]

2. Description of the Related Art FIG. 4 is a block diagram showing a disconnection detecting device in a conventional dual system control system. In the figure, an A-system control system 1 constituting a double-system control system
And the B-system control system 2 are connected by an inter-system bus 3, and reference numerals 4 and 5 indicate connection portions of the bus. The inter-system bus 3 is provided with a signal line 3a used for detecting disconnection. The B-system control system 2 which is a control system on one side of the signal line 3a includes:
The comparator 6 and the disconnection detection circuit 7 are connected.
The disconnection notification from the disconnection detection circuit 7 is transmitted to the B-system control system 2 and the A-system control system 1.

Next, the operation of the disconnection detecting device will be described. The signal line 3a used for disconnection detection is
It is connected to the ground in the A-system control system 1 and pulled up in the B-system control system 2 to be Low.
It is fixed. Intersystem bus 3 for configuring a double system
Is disconnected, or when the bus connection parts 4 and 5 are dropped, the input potential to the comparator 6 mounted on the B-system control system 2 changes from low to high, and the input potential to the disconnection detection circuit 7 is high. To Low. Based on the change, the disconnection is detected by the disconnection detection circuit 7 and B
This prevents occurrence of system switching due to cable disconnection in the system control system 2, transition to dual system control, and transition to both system standby. Further, from the disconnection detection circuit 7 to the A-system control system 1,
The disconnection is notified on a different path from the inter-system bus 3 to prevent occurrence of system switching due to cable disconnection in the A-system control system 1, transition to dual-system control, and transition to dual-system standby.

[0004]

In the conventional system for detecting disconnection of an inter-system connection, there is only one signal line for detecting disconnection, so that the inter-system bus 3 for forming a double system is partially disconnected. In a state where the bus connection parts 4 and 5 are partially coming off, there is a problem that disconnection cannot be detected.

Further, since the disconnection detecting circuit is mounted only on one control system, for example, the B-system control system 2, it is necessary to separately provide a line for notifying the A-system control system 1 by some method.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and is capable of disconnection even when a part of an intersystem bus for forming a multiplex system is disconnected or a part of a bus connection part is dropped. It is an object of the present invention to provide a multiplex control system that enables detection and allows a plurality of control systems to detect disconnections independently or simultaneously.

[0007]

According to a first aspect of the present invention, there is provided a multiplex control system having a function of detecting disconnection of an inter-system connection unit, wherein a plurality of control systems arranged in parallel, and a plurality of control systems are provided. A system bus that forms a multiplexed system by connecting the system buses, a connection part that connects the system buses, a plurality of disconnection detection signal lines disposed between the connection parts, and a plurality of control systems, And a disconnection detecting circuit for detecting disconnection of each of the plurality of signal lines.

[0008] A second aspect of the present invention is a multiplex control system having a disconnection detection function of an inter-system connection unit, wherein a plurality of control systems arranged in parallel and a plurality of control systems are connected to form a multiplex system. The inter-system bus to be configured, a connection part for connecting the inter-system bus, a plurality of disconnection detection signal lines disposed between the connection parts, and a plurality of signal lines disposed in a plurality of control systems and each of a plurality of signal lines And a disconnection detection circuit for simultaneously detecting disconnection.

[0009] The invention of claim 3 is claim 1 or claim 2.
In the invention of the above, data is transmitted and received through an intersystem bus,
A disconnection detection function unit using software for checking the soundness of the data is provided in a plurality of control systems.

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiment 1 Hereinafter, a first embodiment of the present invention will be described with reference to the drawings.

FIG. 1 is a block diagram showing a duplex control system having a function of detecting disconnection of a connection between systems according to a first embodiment of the present invention. In the figure, an A-system control system 1 and a B-system control system 2 are connected by an inter-system bus 3 for configuring a dual system control system, and have bus connection parts 4 and 5, respectively. Intersystem bus 3
Signal lines 3a and 3b used for detecting disconnection are provided. One signal line 3a is connected to a comparator 6 and a disconnection detection circuit 7 on the B-system control system 2 side, and the other signal line 3b is connected to a comparator 8 and a disconnection detection circuit on the A-system control system 2 side. Circuit 9 is connected. The disconnection notification from the disconnection detection circuit 7 is
It is transmitted to the B-system control system 2 and the A-system control system 1.

Next, an operation for detecting disconnection of the duplex control system according to the first embodiment will be described. The signal line 3a used for disconnection detection is connected to the ground in the A-system control system 1, and is connected to the B-system control system 2.
Is pulled up and fixed at Low. On the other hand, the signal line 3b used for disconnection detection is connected to the ground in the B-system control system 2, is pulled up in the A-system control system 1, and is fixed at Low.

When the inter-system bus 3 for forming the double system is disconnected or when the bus connection parts 4 and 5 are dropped, the input potential to the comparator 8 mounted on the A-system control system 1 Changes from low to high, and the input potential to the disconnection detection circuit 9 changes from high to low.
The comparator 6 mounted on the B-system control system 2
The input potential to the disconnection detection circuit 7 changes from High to Low, and the input potential to the disconnection detection circuit 7 changes from High to Low. Then, based on these changes, the disconnection detecting circuits 7 and 9 detect the disconnection, and the system switching due to the cable disconnection in the A system control system 1 and the B system control system 2 occurs, the transition to the dual system control, and the dual system control. Prevent transition to standby.

As described above, according to the first embodiment, a pair of signal lines are arranged on the intersystem bus 3 constituting the duplex control system, and the A-system control system 1 is connected to each of the pair of signal lines.
In addition, since the disconnection detection circuit provided in the B-system control system 2 is connected, both control systems (A-system control system 1 and B-system control system 2) can independently detect the disconnection.

Embodiment 2 Hereinafter, a second embodiment of the present invention will be described with reference to the drawings.

FIG. 2 is a block diagram showing a duplex control system having a function of detecting disconnection of a connection between systems according to a second embodiment of the present invention. In the figure, exclusive OR circuits 11 and 12 are installed in the A-system control system 1 and the B-system control system 2, and the exclusive OR circuit 1
1 is connected to the input of the comparator 6 of the B-system control system 2 via the resistor 13 (series) and the capacitor 16 (parallel), and the exclusive OR circuit 12 of the B-system control system 2 is connected.
Output of a resistor 14 (series) and a capacitor 15 (parallel)
Is connected to the input of the comparator 8 of the A-system control system 1. The output of the comparator 6 installed in the B-system control system 2 is input to the disconnection detection circuit 7 and also to the exclusive OR circuit 12. The output of the comparator 8 provided in the A-system control system 1 is input to the disconnection detection circuit 9 and also to the exclusive OR circuit 12.

More specifically, one input of the exclusive OR circuit 11 of the A-system control system 1 is High when the A-system control system 1 is controlled, and is Low when the B-system control system 2 is controlled. The exclusive OR of the B-system control system 2
One input of the circuit 12 is Low when the A-system control system 1 is controlled and is High when the B-system control system 2 is controlled.
The other inputs of the exclusive OR circuits 11 and 12 are the outputs of the comparators 8 and 6, respectively. Comparators 6, 8
The signal lines 3a and 3b for disconnection detection, which are the inputs of the exclusive OR circuits 11 and 12, are connected to each other between the control systems. The resistor 14 and the capacitor 15 connected to the signal line 3a and the resistor 13 and the capacitor 16 connected to the signal line 3b constitute a circuit that oscillates by a signal transmission delay corresponding to each time constant.

Next, an operation for detecting disconnection of the duplex control system according to the second embodiment will be described. When the inter-system bus 3 for forming the duplex system is disconnected, or when the connection portions 4 and 5 of the bus are dropped, the resistance 14 of the signal line 3a
Then, the oscillation of the circuit composed of the capacitor 15 and the resistor 13 and the capacitor 16 of the signal line 3b stops. As a result, the disconnection detection circuit 7 and the signal detection circuit 9 detect the disconnection at the same time, and both control systems simultaneously cause system switching due to cable disconnection, transition to the dual control system, and transition to the standby for the dual control system. To prevent

Here, since the disconnection detection signal oscillates due to a gap between the control systems, the oscillation stops even if one of the disconnection signals is cut off, and the disconnection is notified to both the control systems. Becomes possible. For example, when the connection part of the bus is a cable connector, the signal lines 3a, 3b
Are arranged at the upper and lower ends of the connector, disconnection can be notified to both systems even if the connector is partially disconnected.

As described above, according to the second embodiment, each of the control systems of both systems has a disconnection for simultaneously detecting the disconnection of each of the plurality of signal lines installed between the connection parts of the inter-system bus. Since the detection circuit is provided, both control systems can independently and commonly detect the disconnection. Further, disconnection can be detected even when a partial disconnection of the intersystem bus or a partial disconnection of a bus connection site occurs.

Embodiment 3 Hereinafter, a third embodiment of the present invention will be described with reference to the drawings.

FIG. 3 is a block diagram showing a duplex control system having a function of detecting disconnection of a connection between systems according to a third embodiment of the present invention. In the figure, the A-system control system 1 and the B-system control system 2 are provided with disconnection detecting function units 17 and 18 by software, respectively, and are connected to each other via an inter-system bus 3. The other configuration is the same as that of FIG. 2 of the second embodiment, and a description thereof will be omitted.

In the third embodiment, data is exchanged through the inter-system bus 3 by the disconnection detecting function units 17 and 18 provided by software provided in the A-system control system 1 and the B-system control system 2, and the data is exchanged. The soundness is checked mutually by the disconnection detection function units 17 and 18. The disconnection is determined when both the disconnection detection by hardware and the disconnection detection by software by checking the data of the disconnection detection function units 17 and 18 according to the second embodiment occur. As a result, 2 is more reliable than in the second embodiment.
Disconnection detection of an inter-system connection in a redundant control system can be provided.

In the above description, the disconnection detecting function unit 1
Although the disconnection detection by software according to 7 and 18 and the disconnection detection by hardware according to the second embodiment are used together,
The disconnection detection by hardware of the first embodiment may be used together.

Further, in the above embodiment, the duplex control system has been described, but the present invention can be similarly applied to a multiplex control system.

[0026]

According to the first aspect of the present invention, each of the plurality of control systems is provided with a disconnection detection circuit for detecting a disconnection of a plurality of signal lines installed between connection points of the intersystem buses. With this arrangement, a plurality of control systems can independently detect disconnection.

According to the second aspect of the present invention, each of the plurality of control systems is provided with a disconnection detecting circuit for simultaneously detecting disconnection of each of the plurality of signal lines provided between the connection parts of the intersystem buses. Therefore, a plurality of control systems can independently and commonly detect a disconnection.

According to the third aspect of the present invention, since the disconnection detecting function unit is provided by software for checking the soundness of data between a plurality of control systems, a more reliable disconnection detection of the intersystem connection unit is provided. Can be provided.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a duplex control system having a function of detecting disconnection of an inter-system connection according to Embodiment 1 of the present invention;

FIG. 2 is a block diagram showing a duplex control system having a function of detecting disconnection of a connection between systems according to a second embodiment of the present invention;

FIG. 3 is a block diagram showing a duplex control system having a function of detecting disconnection of an inter-system connection according to a third embodiment of the present invention;

FIG. 4 is a configuration diagram illustrating a disconnection detection method of an inter-system connection unit in a conventional multiplex control system.

[Explanation of symbols]

1 A control system, 2 B control system, 3 2
Inter-system buses for configuring a redundant system, 3a and 3b: signal lines for disconnection detection, connection portions of 4, 5 buses, 6, 8 comparators, 7, 9 disconnection detection circuits, 11, 12 exclusive OR circuits, 13, 14 resistance, 15, 16 capacitor.

Continued on front page F-term (reference) 2G014 AA02 AC08 5G042 AA03 AA12 5G053 AA07 BA09 EA01 FA06 5K034 AA05 CC06 DD01 HH01 HH02 TT01 5K035 AA03 BB01 DD01 EE14

Claims (3)

[Claims] 1. A multiplexing control system having a function of detecting disconnection of an inter-system connection unit, comprising: a plurality of control systems arranged in parallel; and a plurality of control systems connecting the plurality of control systems to form a multiplexing system. A bus, a connection portion for connecting the inter-system bus, a plurality of disconnection detection signal lines disposed between the connection portions, and a disconnection of the plurality of signal lines disposed in the plurality of control systems. A multiplexing control system having a disconnection detection function for inter-system connection units, comprising: 2. A multiplexing control system having a function of detecting disconnection of an inter-system connection section, comprising: a plurality of control systems arranged in parallel; and a plurality of control systems connected to the plurality of control systems to form a multiplexing system. A bus, a connection part for connecting the inter-system bus, a plurality of disconnection detection signal lines disposed between the connection parts, and a plurality of disconnection detection signal lines disposed in the plurality of control systems, and each of the plurality of signal lines. A multiplexing control system having a disconnection detecting function for detecting disconnection of the system at the same time. 3. The plurality of control systems are provided with a disconnection detecting function unit using software for transmitting and receiving data through the inter-system bus and checking the soundness of the data. A multiplexing control system having a function of detecting disconnection of a connection between systems according to claim 2.