JPH0410798A - Switching control and monitor circuit - Google Patents

Abstract

PURPOSE:To detect malfunction by detecting unmatch between switching information included in a target to be switched and the switching operation of a switching control circuit by a switching circuit for switching two target to be controlled. CONSTITUTION:The switching control/monitor circuit is provided with two operation systems 2, 3 for sending alarm signals 5, 7 at the time of generating failures, switching to the normal operation system at the time of receiving a switching control signal 4 and returning the signal 4 as switching control information 6, 8 and a switching part 1 for outputting the signal 4 to the systems 2, 3 at the time of receiving the alarm signal from the failed operating system to instruct to switch the failed system to the normal system, detecting the unmatch between the information 6, 8 returned from the systems 2, 3 and the signal 4, and when respective signals are different, outputting an alarm output signal 13 to detect the switching abnormality of the systems 2, 3. Namely, the switching part 1 allows the two operating systems 2, 3 to return the switching control information and executes logical judgement based on the returned information. Consequently, the monitoring of the switching control system can easily be executed and the abnormality of the switching system can simply be decided.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a switching circuit that switches between two controlled objects, and in particular detects a mismatch between the switching information of the switching object and the switching operation of the switching control circuit to prevent malfunction. This invention relates to a switching control monitoring circuit that detects.

rPrior art] As shown in Fig. 2(a), a conventional switching control circuit has the following structure.
It consisted of a switching section 1, an active system A2, and an active system B3, and the switching section 1 consisted of a set-reset flip-flop as shown in FIG. 2 (1)). The switching unit 1 is connected to the active system A2 and the active system B3 by the switching control signal 4, the active system A2 and the switching unit 1 are connected by the alarm signal 7, and the active system B3 and the switching unit 1 are connected by the alarm signal 5. It is connected. Furthermore, in the switching section 1, the RS flip-flop 2
One input terminal ALMI of 0 inputs the alarm signal 7 from the active system A2, the other input terminal ALM2 inputs the alarm signal 5 from the active system B3, and the output terminal SEL inputs the alarm signal 7 from the active system A2.
and outputs a switching control signal 4 to the active system B3.

The switching unit 1 receives the warning signal 7 of the working system A output from the working system A2 or the warning signal 5 of the working system B output from the working system B3, and selects the working system to which no alarm signal is output. As such, the switching control signal 4 is output to the active system A2 and the active system B3.

In other words, the alarm signal 7 in the active system A2 and the active system B3
, 4 are explained using Table 1 shown below. When the active system B3 is abnormal, the active system A2 is selected. is abnormal, select active system B3 (alarm signal 7
is "0" and the switching control signal 4 is 0). Also, when both the active system A2 and the active system B3 are abnormal, the active system A2 is given priority and the alarm signal M, 5 is PA O", and the switching control signal 4 is °゛1”
), when active system A2 and active system B3 are normal, hold the parts and hold the first selected active system (alarm signals 7, 5
is '1'' and switching control signal 4 is 1 or 0'').

Table 1 The alarm signal logic for active system A2 and active system B3 is "1"
The logic of the switching control signal 4 is "1" to select the active system A2, and 0" to select the active system 83.

[Problem to be solved by the invention]

In the conventional switching control circuit, the switching control signal 4 is sent to the active system A2 and the active system B3 to designate the active system, but a means for reading switching control information to know the switching state of the active system is also provided. Therefore, there is a drawback that it is impossible to determine whether switching control has been performed normally on the active system.

Further, in the case of such a switching control circuit, although switching control can be performed, there is a drawback that it cannot be verified whether or not the operating system has been properly switched by the switching control signal.

SUMMARY OF THE INVENTION An object of the present invention is to provide a switching control monitoring circuit that eliminates the above-mentioned drawbacks and can verify whether or not switching control of the active system has been performed reliably.

[Means for solving the problem] The switching control monitoring circuit of the present invention sends out an alarm signal when a failure occurs, switches to a normal operating system when receiving the switching control signal, and returns the switching control signal as switching control information. and when receiving the alarm signal from the first or second operating system, outputs the switching control signal to the first and second operating systems to instruct them to switch to the normal operating system. At the same time, a mismatch between the switching control information returned from the first and second active systems and the switching control signal is detected, and if there is a mismatch, an alarm output signal is output to detect a switching abnormality in the active system. It has a switching section.

Further, in the switching control monitoring circuit of the present invention, the switching unit inputs alarm signals from the first and second operating systems to the 7-bit input terminal and the reset I/input terminal, and performs switching control to switch to the normal operating system. A first flip-flop that outputs a signal to the first and second active systems, and inputs switching control information returned from the first and second active systems to a set input terminal and a reset input terminal and outputs the results. detects a mismatch between the switching control and the switching control information from the outputs of the first and second flip-flops, and if there is a mismatch, outputs an alarm output signal and switches the operating system. and a logic element that detects an abnormality.

〔Example〕

Next, embodiments of the present invention will be described with reference to the drawings.

FIG. 1 is a diagram showing an embodiment of the present invention, in which (a) is a circuit block diagram and (b) is a circuit diagram.

This switching control monitoring circuit consists of a switching unit 1, a first active system A2, and a second active system B3,
The switching unit 1 includes a first RS flip-flop 9, a second RS flip-flop 11, an inverter element 10,
It consists of an exclusive OR element 12.

The switching unit 1 is connected to the switching control signal 4 to the active system A2 and active system B3, and is also connected to the alarm signal 7.5 from the active system A2 and active system B3, and is connected to the alarm output signal 13 and the outside. There is. Further, the switching unit 1 is connected to switching control information 8 and 6 obtained by returning the switching control signal 4 from the active system A2 and the active system B3.

Further, the switching unit 1 has a circuit configuration as shown in FIG.
is connected to the RS flip-flop 9 via the inverter element 10.
The output of the RS flip-flop 9 is connected to one end of the input of the exclusive OR element 12. Input terminal A L M 1 is RS flip-flop 1
1 is connected to one end of the input terminal A L M 2 is R
The other end of the S flip-flop 11 is connected, and the output of the RS flip-flop 11 is connected to the other end of the exclusive OR element 12 and the output terminal SEL. The output of the exclusive OR element 12 is the coincidence output terminal A L
Connected to MO. The switching control signal 4 from the switching unit 1 to the active system Δ2 and the active system B3 is output from the output terminal SEL, and the alarm signal 7 from the active system A2 is output from the input terminal AL.
The alarm signal 5 from the active system B3 is input to the input terminals A and LM2. Furthermore, the switching control information 8 of the switching control signal 4 returned by the active system A2 is input to the input terminal SEL1, and the switching control information 6 returned by the active system B3 is input to the input terminal 5EL2.

The switching unit 1 receives the alarm signal 7 of the active system A output from the active system A or the alarm signal of the active system B output from the active system B, and selects the active system to which no alarm signal is output. The switching control signal 4 is output as shown in FIG.

In addition, the active system A and the active system B return the received switching control signal 4 to the switching unit 1 as switching control information 8.6.

The switching unit 1 constantly monitors the returned switching control information 8 and 6. Then, the match and mismatch results from the monitor (alarm ratio horn signal 13) are sent to match output terminals A and LM.
Output from O.

The active system A2 and the active system B3 output alarm signals 7 and 5 to the switching unit 1 when a failure occurs. Further, the switching control signal 4 from the switching unit 1 is returned to the switching unit 1 as switching control information 86.

The RS flip-flop 11 of the switching unit 1 has an input terminal (A
The alarm signals from the active system A2 and the active system B3 are manually input from the LMS, ALM2), and the switching system of the active system A2 or the active system B3 is selected. The switching control signal 4 that selected the switching system is R.
The signal is output from the S flip-flop 11 to the active system A2 and the active system B3 via the output terminal SEL. The switching control signal 4 is also output to one terminal of the exclusive OR element 12.

RS flip-flop 9 is 2. Input terminal (SEL2,5
ELL) to operational system A2. Operational system B3 switching control information 6
．． 8 and outputs the result to the other terminal of the exclusive OR element 12. That is, the switching control information 6 inputted from the input terminal (SEL2) is inputted to one terminal of the RS flip-flop 9 after the signal logic is inverted via the inverter 10, and the switching control information 6 inputted from the input terminal (SEL2) is input to one terminal of the RS flip-flop 9. )
The switching control information 8 inputted from the RS flip-flop 9 is inputted to the other terminal of the RS flip-flop 9. The output result is then given to one input terminal of the exclusive OR element 12.

The exclusive OR element 12 is provided for the purpose of detecting whether two inputs match, and the output result is outputted from a match output terminal (ALMO) to an external circuit as an alarm output signal 13.

This coincidence detection is performed by the RS flip-flop 9 in which the switching control signal 4 output from the switching unit 1 is returned as switching control information 8 and 6 by the active system A2 and the active system B3, respectively.
i control is carried out so that the result of RS flip-flop 11 due to alarm signals 7 and 5 is the same.

Therefore, if the output of the RS flip-flop 9 and the output of the RS control flop 11 match, it is normal, and if they do not match, it is abnormal.

Next, regarding the operation logic of the switching unit 1 in the tree embodiment,
This will be explained with reference to Table 2 below. When the active system B3 is out of order, the alarm signal 5 ('0'' for abnormality) is sent from the active system B3 to the RS flip-flop 11 input terminal (A, I
-M2), and the switching control signal 4 is output from the RS flip-flop 11 to the active system A2 and the active system B3 via the output terminal (SEL). Here, " ] " in the switching control signal 4 means switching to the active system A2. Then, the switching control signal 4 is applied to the active system A2 and the active system B.
3, and the RS flip-flop 90 input terminals (S E L 1., S
EI-2). RS flip flop 9
The switching control information 8.6 input to the 0 input terminal is 1","
If they match at 1'', the exclusive OR element 12 outputs a normal alarm output signal 13 of 0''. Switch again]
1 ] 2 If either or both of the control signals 8 and 6 is "0", the exclusive OR element 12 outputs an abnormality, that is, an alarm output signal 13 of "'1".Next, the operating system A2 When a failure occurs, the alarm signal 7 from the active system A2 is input to the RS flip-flop 11 input terminal (ALMl) of the switching unit 1, and the RS
The switching control signal 4 of "P0" is outputted from the flip-flop 11 to the active system A2 and the active system B3 via the output terminal (SEL).In this case as well, the switching to the RS flip-flop 9 is performed as described above. When the control information 8 and 6 match as '0' and '0', it is normal and it is 'I Q I+', and when they do not match, it is '1'.

In this way, it is possible to determine whether the switching system is normal or abnormal from the output of the exclusive OR element 12, so by using this output, it is possible to confirm the normal operation of the switching systems of active system A2 and active system B3, and to confirm the normal operation of the switching systems of active system A2 and active system B3. Malfunction detection can be realized.

Table 2 Note that the logic of the alarm output signal 13 is "o", which means normal;
1” is considered abnormal.

(Effects of the Invention) As explained above, the present invention allows the switching unit to receive switching control information from two operating systems and to make logical judgments based on the switching control information, thereby improving the performance of the switching control system. This has the effect of allowing easy monitoring and easy determination of abnormalities in the switching system.

[Brief explanation of drawings]

FIG. 1 is a diagram showing an embodiment of the present invention, in which (a) is a circuit block diagram, (b) is a circuit diagram of a switching section, and FIG.
1 is a diagram showing a conventional technology, in which (a) is a circuit block diagram;
(1)) is a circuit diagram. 1...Switching unit 2...Operational system A 3...Operational system B

Claims (2)

[Claims] (1) first and second operating systems that send out an alarm signal when a failure occurs, switch to a normal operating system upon receiving a switching control signal, and return the switching control signal as switching control information; When the alarm signal is received from the active system, the switching control signal is output to the first and second active systems to instruct switching to the normal active system, and the switching control signal is returned from the first and second active systems. A switching control monitoring circuit comprising: a switching unit that detects a mismatch between the switching control information and the switching control signal, and outputs an alarm output signal if there is a mismatch to detect a switching abnormality in the active system. (2) In the switching control monitoring circuit according to claim 1, the switching section inputs alarm signals from the first and second operating systems to a set input terminal and a reset input terminal, and switches to a normal operating system. A first flip-flop outputs a control signal to the first and second active systems, and inputs switching control information returned from the first and second active systems to a set input terminal and a reset input terminal, and outputs the result. A second flip-flop to output, and a mismatch between the switching control and the switching control information are detected from the outputs of the first and second flip-flops, and if there is a mismatch, an alarm output signal is output to control the operation system. A switching control monitoring circuit having a logic element for detecting switching abnormality.