JPH0799819B2 - Switching control method - Google Patents

Description

DETAILED DESCRIPTION [Overview] A switching control method for controlling a controlled unit by a control signal from any one of duplicated control units, and an in-device control for controlling the controlled unit even if the switching unit is not mounted In order to realize a switching control system that enables the operation control signal, an operation instruction signal is sent to one of the control units, and a control signal from the control unit is directly sent to the controlled unit and the operation instruction is sent. When a failure warning signal is received from the control unit that is providing a signal, a switching unit that provides an operation instruction signal to the other control unit is provided, and the switching unit provides a mounting state signal to each control unit at the time of mounting and controls each control unit. The parts provide mounting status signals to each other at the time of mounting, and when each control part does not receive the mounting status signal from the switching part, or when it does not receive the mounting status signal from the partner control part, Control signal to the controlled unit Configure to send directly.

[Industrial application field]

The present invention relates to a switching control system, and more particularly to a switching control system for controlling a controlled unit by a control signal from one of the duplicated control units.

In order to improve the reliability of the entire device, the control unit inside the device is duplicated, but the load on the switching unit that switches between both control units increases accordingly, so even if the control unit is duplicated, switching is performed. There is a possibility that all the internal control of the device will be disabled and the system will be shut down even if a failure occurs in a part.

Therefore, there is a demand for a switching control method that reduces the burden on the switching unit when controlling the controlled units by switching between the duplicated control units, and that can perform in-apparatus control even if some abnormality occurs in the switching unit. There is.

[Conventional technology]

In the conventional switching control method, each duplicated control unit is instructed by the switching unit whether or not to be the active system, and the control signal from the active control unit is switched by the switching circuit in the switching unit. Then, it is connected to the controlled part and controls it.

FIG. 4 is a diagram showing a configuration example of a conventional switching control system, in which 60 and 70 are redundant control units, 50 is a fault warning signal from each control unit 60 or 70, and gives an operation instruction. A switching unit for generating an operation instruction signal and for switching and transmitting the control signal from the control unit 60 or 70, 4 is a controlled unit controlled by the control signal switched by the switching unit 50,
Are shown respectively.

In the operation of such a switching control system, first, the switching control circuit 51 of the switching unit 50 is controlled by the control circuits 61 of the control units 60 and 70.
And 71 to monitor each failure alarm signal, and normally gives an operation instruction signal for instructing to become an operation system to one of the predetermined control circuits 61 or 71. When the failure alarm signal is received by the circuit 61 or 71, an operation instruction signal is given to the other control circuit that is not issuing the failure alarm signal, and an operation instruction is issued by instructing the switching circuit 52 of the switching unit 50. A control line from the control circuit to which a signal is given is selected and connected to the controlled section 4.

Upon receiving the operation instruction signal, the control circuit 61 or 71 of the control unit 60 or 70 sends a control signal and sends the control signal to the controlled unit 4 via the control line selected by the switching circuit 52. The unit 4 is controlled in the apparatus.

Each control circuit 61 or 71 of the control unit 60 or 70 monitors the connection state of its own control signal in the switching circuit 52 of the switching unit 50 to the controlled unit 4 at the time of startup (when the power is turned on). Determine whether or not there is a connection, generate a fault warning signal when an abnormal condition such as erroneous control occurs in the control means for the controlled unit 4, and operate only when it is determined that no connection is made. It is configured to wait for an instruction.

[Problems to be Solved by the Invention]

In such a conventional switching control system, each control circuit in the duplicated control unit generates a control signal in response to an operation instruction signal from the switching control circuit in the switching unit, and switches by the switching circuit in the switching unit. When the switching unit is not mounted (because the switching unit is not mounted due to failure, repair, etc.) because it is connected to the controlled unit after it is connected, the existence value of the switching unit increases. , Neither of the duplicated control units can be an active system, and as a result,
Since the control signal is not generated and the control line to the controlled unit is not connected, there is a problem that the controlled unit cannot be controlled.

Therefore, it is an object of the present invention to realize a switching control system that enables in-apparatus control for controlling a controlled unit even if the switching unit is not mounted.

[Means for Solving the Problems]

In the switching control method according to the present invention for achieving the above object, as shown in principle in FIG.
2 sends an operation instruction signal to the control section 4 directly to the controlled section 4 and, when a failure warning signal is received from the control section giving the operation instruction signal, the other control A switching unit 3 for giving an operation instruction signal is provided in the unit, and the switching unit 3 gives a mounting state signal to each control unit 1 and 2 at the time of mounting, and each control unit 1, 2 gives a mounting state signal to each other at the time of mounting. Yes, each of the control units 1 and 2 receives the control signal from its own control unit when not receiving the mounting state signal from the switching unit 3 or receiving the mounting state signal from the partner control unit. It is characterized in that it is directly sent to No. 4.

Further, when any of the control units 1 and 2 is outputting the mounting state signal to the other side, the control unit receiving the priority start signal preferentially sends the control signal directly to the controlled unit 4. Is also featured.

[Action]

In the present invention, in controlling the controlled part by the control signal from either one of the duplicated control parts, the connection of the control signal is switched by the switching circuit in the switching part, in contrast to the conventional method. We focused on connecting directly to the controlled part without passing through.

That is, as shown in principle in FIG. 1, first, the switching unit 3 instructs one of the redundant control units 1 and 2 to operate as an operating system. Send a signal. Upon receiving this signal, the control unit directly sends to the controlled unit 4 a control signal for controlling the operation and setting of the device and the processing procedure of the input / output signal.

Further, when the switching unit 3 gives an operation instruction signal to either one of the redundant control units 1 and 2,
When the control unit receives a failure warning signal generated when an abnormality occurs by monitoring the connection state of its control signal to the controlled unit 4, the control unit stops sending the operation instruction signal to the control unit, The operation instruction signal is given to the other control unit that is not connected to the control unit 4 (that is, does not issue the failure alarm signal). As a result, one of the control units always becomes an active system, and the other control unit is in a state of waiting for an operation instruction from the switching unit 3.

Further, the switching unit 3 gives a mounting state signal indicating that the control unit 1 and 2 are mounted only when the switching unit 3 itself is mounted. Further, in this case, each of the control units 1 or 2 gives a mounting state signal to the other control unit only when the respective control units 1 or 2 are mounted.

Therefore, when each control unit 1 or 2 does not receive the mounting state signal from the switching unit 3, that is, when the switching unit 3 is not mounted, it is not possible to obtain an instruction as to whether each control unit 1 or 2 is an active system. Therefore, this time, confirm the mounting status signal from the control unit of the other party, but when the mounting status signal from the control unit of the other party is not received, that is, when the control unit of the other party is also not mounted, the self is the operating system. When it is determined that there is such a control signal, the control signal from the control unit is connected to the controlled unit 4 to control the controlled unit 4.

On the other hand, when each control unit 1 or 2 does not receive the mounting state signal from the switching unit 3, that is, when the switching unit 3 is not mounted, when receiving the mounting state signal from the other control unit, That is, when the duplicated control units 1 and 2 are mounted together, the control unit receiving the priority start signal becomes the active system with priority, and the control signal from the self control unit is connected to the controlled unit 4. The controlled unit 4 is controlled by the control.

As a result, when the switching unit 3 is not mounted, and even when one of the redundant control unit and one of the two is not mounted, the control unit to be the active system is always instructed to send the control signal and control the controlled unit 4. In-apparatus control for controlling

〔Example〕

FIG. 2 is a diagram showing an embodiment of the switching control system according to the present invention, in which 10 is a terminal control device for sending a control command, and 20 is a device for taking in a control command from the terminal control device 10. It shows a terminal device that performs control, and is configured by each of redundant control units 1 and 2, a switching unit 3, and a controlled unit 4.

The control units 1 and 2 respectively include an operation instruction signal for instructing an operation system from the switching unit 3 and the other control unit at the time of activation, and the switching unit 3
Condition determination circuits 11 and 21 for determining whether or not the device is an active system by capturing each mounting state signal indicating whether the other control unit is mounted or not, and the priority start signal, and the condition determination circuit 11 Control circuits 12 and 22, which take in a basic control command from the terminal control device 10 and generate a control signal when the condition is judged to be an active system by the control circuit and the control circuit.
Control signal connection circuits 13 and 23 that send a control signal from 12 and 22 to the controlled unit 4 and generate a fault alarm signal when the controlled unit 4 is abnormally controlled, and pull-up resistors R1 and R2.
Connected to the + 5V power supply in the terminal device 20 via the, and if this control unit is not mounted, it outputs a "1" level mounting status signal, and if it is mounted, it is grounded. It is composed of mounting state signal generators 14 and 24 that output a mounting state signal of "0" level.

In addition, the switching unit 3 receives a failure alarm signal from the control unit 1 or the control unit 2 and generates a operation instruction signal to either one of the control units via a switching control circuit 51 and pull-up resistors R3 and R4. Connected to the + 5V power supply in the terminal device 20, and when the switching unit 3 is not mounted, it outputs a mounting state signal of "1" level, and when mounted, it is grounded to "0". And a mounting state signal generator 32 that outputs a mounting state signal of a level.

Further, the controlled unit 4 includes a low speed interface unit 41 that receives a control signal, a multiplexing / demultiplexing unit 42, and a high speed interface unit 43.
It consists of and.

Next, the operation of this embodiment will be described with reference to the control processing flowchart shown in FIG. Although the following description is for the control unit 1, the same applies to the control unit 2.

First, at startup (when the power is turned on or set), the control unit 1
The condition determination circuit 11 of FIG.
Check the mounting status signal from (Step S in Fig. 3)
1).

As a result, if the mounting state signal is "0" level (grounded state) and the switching unit 3 is mounted, it is confirmed whether or not there is an operation instruction signal from the switching control circuit 51 (at step S2). ). The switching control circuit 51 is to specify it is no failure alarm signal from the control unit 1 as the active system, when any of the control unit 2 also is normal, select one in which either Output the operation instruction signal.

As a result, when the operation instruction signal is received, the control unit 1 itself makes a condition determination so as to be the operation system, and the control circuit 12
To the terminal control device 10
The control command composed of the command information of the rough processing unit level is converted into the control signal composed of the executable subdivided control information and sent to the control signal connection circuit 13 (at step S6).

The control signal connection circuit 13 sends a control signal to the controlled unit 4 and monitors the connection state of the control signal to the controlled unit 4 to notify the switching control circuit 51 of the switching unit 3 when the control content is abnormal. A fault warning signal is generated (at step S7).

Further, when the operation instruction signal is not received from the switching control circuit 51 of the switching unit 3 (third step S2), the operation instruction is not issued from the condition judging circuit 11 of the control unit 1 to the control circuit 12 and the operation instruction waiting It becomes a state (the same step S3). In this case, the switching control circuit 51 always sends the operation instruction signal to the other control unit 2.

When the mounting state signal from the mounting state signal generating unit 32 of the switching unit 3 is "1" level (level by the pull-up resistor R3) and the switching unit 3 is not mounted ( At the time of non-mounting determination in step S1), the mounting state signal from the mounting state signal generation unit 24 of the other control unit 2 is confirmed (step S4).

Then, when the mounting state signal is "0" level, the other control unit 2
If it is found that the control unit 1 or 2 is installed, it is not known which of the control units 1 and 2 should be operated. Therefore, the presence / absence of the priority start signal is confirmed this time (step S5).

When the priority activation signal is received, the control unit 1
It is determined that itself is the active system, and the same process as steps S6 and S7 is performed.

Furthermore, when the priority start signal has not arrived (at step S5)
Causes the control unit 1 to wait for an operation instruction (at step S3).

Further, the condition judging circuit 11 of the control unit 1 determines that the mounting state signal is at the "1" level, that is, when the other control unit 2 is not mounted (step S4), the control unit 1 is irrespective of the presence or absence of the priority start signal. Determine that you are the active system, and step
It is processed similarly to S6 and 7.

As a result, the controlled unit 4 takes in a control signal from any one of the control units, in this case, the control unit 1, and instructs, for example, a method of multiplexing a plurality of signal lines in the low speed interface unit 41. A control instruction such as sending to the multiplexing / separating unit 42 and passing through the high speed interface unit 43 is executed, and the control inside the device is completed.

〔The invention's effect〕

As described above, in the switching control method according to the present invention,
Each redundant control unit considers the presence or absence of a switching unit, the presence or absence of the other control unit, and each condition of priority start, and determines whether or not the control unit itself becomes the active system, and becomes the active system. In this case, since the control signal is directly sent to the controlled unit, the switching control that enables the in-device control to control the controlled unit even if the switching unit is not mounted or the other control unit is not mounted. The system will be realized.

Therefore, the existence value of the switching unit can be reduced, and the reliability of the control function of the entire device can be improved.

[Brief description of drawings]

FIG. 1 is a block diagram for explaining the principle of the switching control system according to the present invention, FIG. 2 is a diagram showing an embodiment of the switching control system according to the present invention, and FIG. 3 is a diagram showing an embodiment of the present invention. FIG. 4 is a flow chart for explaining the switching control operation, and FIG. 4 is a block diagram showing a conventional example. In FIG. 1, 1, 2 ... Control unit, 3 ... Switching unit, 4 ... Controlled unit In the figure, the same reference numerals indicate the same or corresponding parts.

Claims (2)

[Claims] 1. A switching control system for controlling a controlled part (4) by a control signal from any one of the duplicated control parts (1) and (2), wherein any control part (1) ( 2) to send an operation instruction signal to the control section (4) directly to the controlled section (4) and receive a failure warning signal from the control section giving the operation instruction signal, A switching unit (3) for giving an operation instruction signal is provided to the other control unit, and the switching unit (3) gives a mounting state signal to each of the control units (1) and (2) at the time of mounting, and each control unit (1) ( 2) gives mounting state signals to each other during mounting, and each control unit (1)
When (2) does not receive the mounting state signal from the switching unit (3) and does not receive the mounting state signal from the partner control unit, the control signal from the self control unit is sent to the controlled unit (4). Switching control method characterized by sending directly to the. 2. When any of the control units (1) and (2) is outputting a mounting state signal to the other side, the control unit receiving the priority start signal gives priority to the control signal (the controlled unit). 4. The switching control system according to claim 1, wherein the switching control system is directly sent to 4).