JPH0668683B2 - Control output relay check circuit of controller - Google Patents

Description

Description: FIELD OF THE INVENTION The present invention relates to a control output relay check circuit of a control device, and more particularly to a control device suitable for checking the operation of relay contacts in the control device. Control output relay check circuit.

[Background of the Invention]

When the system to be controlled is mainly composed of an electromagnetic relay or the like, the control device 1 opens and closes a plurality of relay contacts provided therein as shown in FIG. In many cases, the control target system 2 is controlled by applying (H or L data) to the control target system 2. In this case, in order to check whether or not the plurality of relay contacts in the control device 1 have normally operated, parity check, multiple output check, double output check, etc. are performed. This is because an abnormality occurs in the DO circuit (Digital Output circuit) or the control output relay that drives the control output relay in the control device 1, and the control target system 2 is given erroneous 2 control data, and the control target system 2 is serious. This is to prevent such a situation from happening. In particular,
In the controlled system 2 requiring high reliability, the magazine “Electric Railway” VOL. 36, No. 2, "Shinkansen electric power system control system", DI circuit (Digital Input circuit)
Checking is performed by inputting to the logic unit via.

FIG. 3 is a diagram showing an example of a case in which the state of the relay contact of the control output relay described above is input to the logic section via the DI circuit and checked. In FIG. 3, the control device 1
Is a logic unit 3, DO circuits 4-1 to 4-n, 5, and DI
Circuits 6-1 to 6-n, 7 and control item relays RY1 to R
Yn, control execution relay RYE, and relay contacts ry1a to ryna, ryea, ry1b to ry of these relays.
It is composed of nb and ryeb. Here, the relay contacts ry1a to ryna and ryea are relay contacts for generating a control output to the controlled system 2, and the relay contacts ry1b to rynb and rye are check relay contacts. The controlled system 2 is mainly configured by the relays RC1 to RCn.

In FIG. 3, the logic unit 3 is a control item relay RY1 to R.
Some of Yn and control execution relay RYE
It is driven by the O circuits 4-1 to 4-n, 5. Thereby, some relay contacts ry1a to ryna corresponding to the driven control item relays RY1 to RYn are closed,
Further, the relay contact ryea of the control execution relay RYE is closed, and the voltage P (+ 48V, + 110V, etc.) inputs two control data (H or L data) to the relays RC1 to RCn in the controlled system 2. Further, some relay contacts ry1b to rynb corresponding to the driven control item relays RY1 to RYn and a control execution relay RYE.
The relay contacts ryeb of are also closed, and these relay contacts ryb
The states of 1b to rynb and ryeb are DI circuits 6-1 to 6
It is taken into the logic unit 3 via -n and 7. DI circuit 6
-1 to 6-n, 7 are connected relay contacts ry1
When b to rynb and ryeb are in the open state, an H level signal is output, and when they are in the closed state, an L level signal is output to the logic unit 3.

Next, referring to FIG. 4, control item relays RY1 to RY
n, the control execution relay RYE, and the relationship of the control output to the controlled system 2 will be described. As shown in the figure, the control item relays RY1 to RYn first operate and the corresponding relay contacts ry1a to ryna and ry1b to rynb are closed. Next, the control execution relay RYE operates, and the relay contacts ryea and ryeb are closed. Accordingly, the states of the relay contacts ry1a to ryna are 2 control data,
It is input to the controlled system 2.

Next, according to the flow chart shown in FIG.
The processing operation in will be described. First, step S
1, the relay contact ry1b for each check of the control item relays RY1 to RYn and the control execution relay RYE.
The states of rynb and ryeb are detected, it is confirmed that they are all open, and if NO, a control output abnormality process is performed in step S10. If YES is determined in step S1, necessary control item relays RY1 to RYn are operated in step S2. Next, step S3
, The control item relays RY1 to RYn are delayed by a sufficient time (about 50 ms) to operate, and then, at step S4, the check relay relays ry1b to rynb,
From the state of ryeb, it is confirmed that there is no abnormality in the operation of the control item relays RY1 to RYn and that the control execution relay RYE is not operating. If NO in step S4, the process proceeds to step S10 to perform control output abnormality processing, and if YES is determined, step S5.
Then, the control execution relay RYE is operated. Next, in step S6, after delaying by a time (about 50 ms) sufficient for the control execution relay RYE to operate, in step S7, the control execution relay RYE is changed from the state of the check relay contact ryeb to the control execution relay RYE. Make sure RYE is working properly. If NO is determined in step S7, the control output abnormality process is executed in step S10, and if YES is determined, in step S8 it is sufficient time for the controlled system 2 to capture the 2 control data (about After a delay of 100 ms to several seconds), the control item relay and the control execution relay are brought back to operation at step S9. It is to be noted that, at steps S1, S4 and S7, it is judged as NO, and after the control output abnormality processing (control data reset processing, external alarm output, etc.) at step S10 is performed, at step 9 the control item relay RY is executed.
1 to RYn and control execution relay RYE are returned to operation.

By the way, one of the recent demands for the control device 1 is a demand for miniaturization. With the realization of highly integrated ICs, software for logic processing, etc., the logic unit 3 is becoming smaller and more compact year by year. However, for the control output section, it is necessary to use an electromagnetic relay in order to prevent the effects of surge migration from the controlled system 2 and surges due to lightning strikes, etc. There is.

To reduce the size of the control output unit that uses an electromagnetic relay,
It is necessary to use a small one for the electromagnetic relay itself, but it is not possible to prepare a relay contact for a check with a single relay contact. Therefore, there is a limit to downsizing the control output unit using such a small electromagnetic relay.

Further, as shown in FIG. 3, the electromagnetic relay has two relay contacts. When one is used for control output and the other is used for check, only the relay contact for check is normally operated. When it operates and the relay contact for control output does not operate normally due to contact welding or the like, an abnormality cannot be detected, and the controlled system 2 may be in a serious situation.

[Object of the Invention]

The present invention has been made in view of the above-mentioned problems of the conventional technology, and can reliably detect an abnormality of an electromagnetic relay for control output used in a control output unit with high reliability, and more than conventional ones. Another object is to provide a control output check circuit of a miniaturized controller.

[Outline of Invention]

In the check circuit of the control relay in the control device that uses the relay contacts of the plurality of control relays that operate based on the control data as switches that provide the operating voltage to each of the plurality of control targets, the operating voltage is applied to the control target. As a relay contact of the control relay for giving a transfer contact, a transfer contact having a set of a common contact, a normally open contact, and a normally closed contact is provided, and the common contact of the relay contacts is operated and applied based on the control data. Connect a voltage switching relay that switches between the operating voltage and the check voltage,
A normally-open contact of the relay contact is connected to a corresponding control target, and a normally-closed contact of the relay contact is used as a determination unit that determines whether or not the operation of the relay contact of the control relay responds to the control data. By connecting, by the determining means, the voltage switching relay is switched to the check voltage based on the control data, and the voltage signal appearing at the normally-closed contact of the relay contact when the control relay is operated is taken in. This is achieved by the control output relay check circuit of the control device, characterized in that it is determined whether or not the operation of the relay contact is responsive to the control data.

In the present invention, the operation of the relay contact of the control relay is checked at the preparatory stage by using the relay contact itself that gives the operating voltage based on the control data to the controlled object. Therefore, highly reliable check and highly reliable control can be performed. Output can be executed.

[Examples of the Invention] Hereinafter, the present invention will be described in more detail with reference to Examples shown in the accompanying drawings.

FIG. 1 is a diagram showing an embodiment of the present invention, and the same parts as those in the conventional example shown in FIG. The difference from the conventional example shown in FIG. 3 is that control item relays RY1 to R
Yn and the control execution relay RYE are provided with relay contacts ry1 to ryn, rye consisting of a single transfer contact, and the single relay contacts ry1 to ryn, rye are shared for control output and check. is there.

That is, the voltage P (value of + 48V, + 110V, etc.) is applied to the normally open contact A of the relay contact rye of the control execution relay RYE that switches between the operating voltage and the check voltage, and the normally closed contact B is applied to the check voltage N. (0V or the like) is applied, and the common contact C is the relay contact r of the control item relays RY1 to RYn.
It is connected to each common contact C of y1 to ryn and the DI circuit 7. Further, the normally open contacts A of the relay contacts ry1 to ryn of the control item relays RY1 to RYn are connected to the relays RC1 to RCn of the controlled system 2, and the relay contacts ry.
The normally-closed contacts B of 1 to ryn are connected to the DI circuits 6-1 to 6-n as shown in the drawing.

The switching operation of the controller of the embodiment shown in FIG. 1 is as follows. The DO circuit 5 outputs an H level signal to the control execution relay RYE based on the control data of the logic unit 3 to drive it, the common contact C of the relay contact rye is set to the contact A, and the operating voltage P is applied to the common contact C. To do. And
Based on the control data of the logic unit 3, the DO circuits 4-1 to 4-n
When an H-level signal is output from the control item relays RY1 to RYn to drive, the common contact C of the relay contacts ry1 to ryn is set to the contact A, and the operating voltage P applied to the common contact C corresponds to the control target. System 2 relay RC
The output is controlled to 1 to RCn. Further, based on the control data of the logic unit 3, the control items relay R from the DO circuits 4-1 to 4-n.
By outputting an L level signal to Y1 to RYn, the common contact C of the relay contacts ry1 to ryn is switched to the contact B,
The operating voltage applied to the controlled relays RC1 to RCn is turned off. By thus controlling the drive of the control item relays RY1 to RYn according to the control data of the logic unit 3, it is possible to selectively control and output the operating voltage to any corresponding relays RC1 to RCn of the controlled system 2. it can.

Next, the relay contact r of each control item relay RY1 to RYn
A determination operation of whether or not the operation of y1 to ryn responds to the control data of the logic unit 3 will be described with reference to the flowchart shown in FIG.

That is, the determination in step S1 is based on the control data of the logic unit 3 that all the relays RY1 to RYn and RYE are not driven by the L level signals from the DO circuits 4-1 to 4-n, 5. As a result, the common contact C of the relay contact rye of the control execution relay RYE is set to the normally closed contact B and switched to the check voltage N (OV).
Is the relay contact ry1 of the control item relays RY1 to RYn
It is input to the common contact C of ryn and the DI circuit 7. The control relays RY1 to RYn have relay contacts ry1 to r
Since the common contact C of yn is set to the normally closed contact B, D
All the inputs of the I circuits 6-1 to 6-n become L level signals based on the voltage N, and by taking in these signals, the logic section 3 relays contacts ry1 to r of the relays RY1 to RYn.
It can be determined that the action of yn is in response to the control data. At the same time, the L level signal of the DI circuit 7 determines that the relay contact point rye of the control execution relay RYE is normal. If the DI circuits 6-1 to 6
Even if one of the signals acquired from −n is H based on the voltage P,
When a level signal is input, relay contact r
Since y1 to ryn and rye do not respond to the control data, the process proceeds to step S10.

In the determination in step S4, the DO circuits 4-1 to 4-N output H level signals based on the control data of the logic unit 3 to drive the relays RY1 to RYn. At this time, the relay RYE remains undriven. As a result, the common contact C of the relay contacts rye of the control execution relay RYE that is not driven is set to the normally closed contact B, and the control relays RY1 to RY
The voltage N is input to the common contact C of the n relay contacts ry1 to ryn and the DI circuit 7, and in this state, the control relay RY
When 1 to RYn are driven, the common contact C of the relay contacts ry1 to ryn is set to the normally open contact A, and the normally closed contact B is opened. Accordingly, the corresponding DI circuit 6-1
An H-level signal is input to 6-n, and the determination in step S4 is performed.

That is, when one or a plurality of the relays RY1 to RYn is selectively driven according to the control data, the corresponding D
If the I circuits 6-1 to 6-n become the H level, the relay contact r
The logic unit 3 determines that the operations of y1 to ryn are in response to the control data, and conversely, the corresponding DI circuits 6-1 to 6-n become the H level, or the corresponding DI circuits do not correspond. When 6-1 to 6-n are at the H level, it is determined that there is no response. All relays RY1 to RY
When n is driven, it is determined that the DI circuits 6-1 to 6-n are responsive if an H level signal is input to all of the DI circuits 6-1 to 6-n. If any L level signal is input, relay contacts ry1 to r
Since the operation of yn does not respond to the control data, the process proceeds to step S10. Further, if the L level signal is input to the DI circuit 7, it is responding, and if the H level signal is input, it is not responding, and at this time also, the process proceeds to step S10.

The reason why the H level signal is input to the DI circuits 6-1 to 6-n when the normally closed contacts B of the relay contacts ry1 to ryn are in the open state is as follows. . That is, each input side of the DI circuits 6-1 to 6-n is connected to a voltage source via a resistor (not shown), and therefore, the normally closed contacts B of the relay contacts ry1 to ryn are connected.
This is because the input side of the DI circuits 6-1 to 6-n becomes H level by the above voltage source when is opened.

The determination in step 7 is based on the control data of the logic unit 3,
The DO circuit 5 outputs an H level signal to drive the relay RYE. As a result, the relay contact rye of the relay RYE
Common contact C of is set to contact A and voltage D
By detecting the input of the H level signal to the I circuit 7, it is determined that the relay contact rye is responding to the control data in the logic unit 3. If the H level signal is not input to the DI circuit 7, the relay contact r
It is determined that yes does not respond to the control data, and the process proceeds to step S10.

As described above, when it is determined in each of the steps S1, S4 and S7 that there is an abnormality, the process proceeds to step S10 and the same process as the conventional process is performed. If it is determined that the operation of each of the relays RY1 to RYn and the relay contacts ry1 to ryn and rye of RYE responds to the control data in each step, the determination operation is performed through the return in step S9. To finish.

As is apparent from the above description, in the present embodiment, the operating voltage and the check voltage are switched to the voltage source circuit that applies the operating voltage to the common contact C of the relay contacts ry1 to ryn of the control item relays RY1 to RYn. A voltage switching relay is connected, and the voltage is switched by the control execution relay RYE that operates based on the control data. The control relays RY1 to RYn
Of the relay contacts ry1 to ryn of the relay R
Since the determination voltage is switched to the check voltage by YE and the determination operation is performed, the determination operation can be performed without adding malfunction voltage or the like to the controlled object. Further, the determination of the operation of the relay contact rye of the control execution relay RYE can be performed at the same time.

In addition, before the control output that gives the operating voltage to the controlled object, the relay contact judgment of the control relay can be checked at the preparatory stage, and the control output can be executed while checking it step by step. It is possible to control the output of the operating voltage with high reliability without the accident.

Further, as the control relay, a relay having a common contact, a normally-open contact, and a normally-closed transfer contact as a set is used as the relay contact.
RYn and control execution relay RYE, and a control output unit including these relay contacts ry1 to ryn, rye, etc. can be downsized, and in turn, downsizing of the entire control device 1 can be realized. Moreover, since the abnormality check is performed by using the relay contacts ry1 to ryn, rye themselves that output the two control data to the controlled system 2, it is possible to detect the abnormality with higher reliability than the prior art. it can.

〔The invention's effect〕

As is clear from the above description, according to the present invention, it is possible to reliably and reliably detect the abnormality of the electromagnetic relay used in the control output unit of the control device, and to execute the reliable control output. It is possible to provide a control device that is possible and has a miniaturized control output unit.

[Brief description of drawings]

FIG. 1 is a circuit diagram showing an embodiment of the present invention, FIG. 2 is a diagram showing an outline of a control device and a control target system which are objects of the present invention, and FIG. 3 is a conventional control device and a control target system. FIG. 4 is a time chart showing the operation of the conventional example shown in FIG. 3, and FIG. 5 is a flow chart for explaining the operation of the circuit shown in FIG. 1 and FIG. 1 ... Control device, 2 ... Control target system, 3 ... Logic part, 4-1 to 4-n, 5 ... DO circuit, 6-1 to 6-
n, 7 ... DI circuit, RY1 to RYn ... control item relay, RYE ... control execution relay, ry1 to ryn, ry
e ... Relay contact.

Claims (2)

[Claims] 1. A check circuit for a control relay in a control device using relay contacts of a plurality of control relays, which operate based on control data, as switches for applying an operating voltage to a corresponding one of a plurality of control targets. As a relay contact of the control relay that gives an operating voltage,
A transfer contact having a set of a common point, a normally open contact, and a normally closed contact is provided, and the common voltage of the relay contacts is operated based on the control data to switch the applied operating voltage and the check voltage. Connect the voltage switching relay,
Judgment means for connecting the normally open contact of the relay contact to the corresponding controlled object and judging whether the operation of the normally closed contact of the relay contact responds to the control data or not. Connected to, by the determination means,
Taking in the voltage signal appearing in the normally closed contact of the relay contact when switching the voltage switching relay to the check voltage based on the control data and operating the control relay, the operation of the relay contact of the control relay is the control data. A control output relay check circuit for a control device, characterized in that it is determined whether or not it is responsive to. 2. A common contact of relay contacts of the voltage switching relay, wherein a common contact of relay contacts is connected to the judging means, and the judging means switches the voltage switching relay based on the control data. The control output of the control device according to claim 1, characterized in that a voltage signal appearing in (1) is taken in and it is determined whether or not the operation of the relay contact of the voltage switching relay responds to the control data. Relay check circuit.