JP6435250B2 - Contact input control device - Google Patents

Description

  The present invention relates to a contact input control device used in, for example, an electronic interlocking system for railway signal security control.

  In the field of railways, in order to operate trains safely and efficiently, electronic interlocking devices are used that provide a certain order and restrictions on the handling of traffic lights, switchboards, and the like. For this electronic interlocking device, an input device is used as shown in Patent Document 1 in order to capture the operating state of field equipment such as a traffic light and a switch machine via a relay.

  In the input control device of Patent Document 1, two photocouplers are connected from a direct current power source via an open / closed input contact indicating an operation state of a field device. These input couplers with built-in photocouplers are connected to the control unit and terminals that send and receive I / O signals, and input to the control unit by responding to the contact input signal in response to the control signal from the control unit. It is possible to determine a state where there is no contact input which is an open state of a contact or a state where there is a contact input which is a closed state.

  Further, instead of the input control device of Patent Document 1, an input control device 1 in which photocouplers P1 and P2 and a resistor R2 connected in series to the resistor R1 shown in the block circuit configuration diagram of FIG. 5 are connected in parallel can be used. . Then, as shown in the block circuit configuration diagram of FIG. 6, a contact input unit group 3 including a plurality of contact input units 2 each having an input contact N connected to each input unit is provided, and a plurality of contact input unit groups 3 are further provided. It is also possible to connect to one control unit 4 for operation.

  The control unit 4 shown in FIG. 6 includes a contact input signal input unit 4a that inputs a contact input signal from the contact input unit group 3, and an input control signal output unit 4b that outputs an input control signal to the contact input unit group 3. And an input address signal decoder section 4c for transmitting a group input address signal to the contact input section group 3.

  FIG. 7 shows a state in which the open / closed state of the input contact N input to the contact input unit 2 is determined with respect to one specific contact input unit group 3 ′ specified in the plurality of conventional contact input unit groups 3. It is a flowchart figure of the control part.

  In step s1 ′, an L (Low) level input control signal of the contact input control device signal is output to the specific contact input unit group 3 ′, and an H (High) level input control signal is output to the other contact input unit group 3. In step s11 ′, it is determined whether or not the contact input signal of the input contact N from the specific contact input unit group 3 ′ is at the L level.

  In step s2 ′, when the contact input signal of the specific contact input unit group 3 ′ is L level in step s11 ′, the specific contact input unit group 3 ′ is H level, and the other contact input unit group 3 is L level. In step s21 ′, it is determined whether or not the contact input signal of the input contact N from the specific contact input unit group 3 ′ is an H level signal.

  In step s3 ′, when the contact input signal of the specific contact input unit group 3 ′ is an H level signal in step s21 ′, an L level input is made to the specific contact input unit group 3 ′ and the other contact input unit group 3. A control signal is output, and it is determined in step s31 ′ whether the contact input signal of the input contact N from the specific contact input unit group 3 ′ is an L level signal.

  When all the determinations of steps s11 ′, s21 ′, and s31 ′ of steps s1 ′, s2 ′, and s3 ′ are y, that is, they match, it is determined that the input contact N of the specific contact input unit group 3 ′ is in a closed state. can do.

  In the case of n in any of the determination processes, it is possible to determine the failure of the contact input unit 2 of the specific contact input unit group 3 ′, the open state of the input contact N, or the like. Then, the determination processing of these steps s1 'to s3' is sequentially performed for each contact input unit group 3.

  FIG. 8 shows a timing chart when the input contact N of the specific contact input section group 3 'to be specified is closed. Note that the determination processing in steps s11 ', s21', and s31 'in FIG. 7 corresponds to the processing at the input timing t3 of the control unit 4 in FIG.

  In the contact input unit 2 shown in FIG. 5, when the input contact N is closed and an L-level input control signal is received, a current Ia caused by the resistors R1 and R2 flows through the input contact N. On the other hand, when the input contact N is closed and an H-level input control signal is received, the current Ib by the resistor R1 flows through the input contact N.

  Generally, since R1: R2 = 1: 2, current Ia: current Ib = 1: 3. For example, when one input contact N and contact input unit 2 are arranged in each of the contact input unit groups 3 having m groups, and all these input contacts N are closed, the input contacts The total contact current value flowing through N is calculated.

The contact current when the input control signal of the specific contact input unit group 3 ′ in step s1 ′ is set to the L level and the input control signal of the other contact input unit group 3 is set to the H level is as follows.
Contact current of specific contact input unit group 3 ′ = Ia
Contact current of other contact input unit group 3 = (m−1) Ib
Total contact current (s1 ′) = Ia + (m−1) Ib
= Ia + (m-1) 3Ia = (3m-2) Ia

The contact current when the input control signal of the specific contact input unit group 3 ′ in step s2 ′ is the H level signal and the input control signal of the other contact input unit group 3 is the L level signal is as follows.
Contact current of specific contact input unit group 3 ′ = Ib
Contact current of other contact input unit group 3 = (m−1) Ia
Total contact current (s2 ′) = Ib + (m−1) Ia
= 3Ia + (m-1) Ia = (m + 2) Ia

Contact currents when the input control signals of the specific contact input unit group 3 ′ and other contact input unit group 3 in step s3 ′ are set to the L level are as follows.
Contact current of specific contact input unit group 3 ′ = Ia
Contact current of other contact input unit group 3 = (m−1) Ia
Total contact current (s3 ′) = Ia + (m−1) Ia = mIa

Here, for example, when the contact current total value and the amount of change when m = 1, m = 10, and m = 20 are calculated,
When m = 1, the contact current (s1 ′) is Ia, the contact current (s2 ′) is 3Ia, the contact current (s3 ′) is Ia, and the maximum amount of change is 2Ia.

  When m = 10, the contact current (s1 ') is 28Ia, the contact current (s2') is 12Ia, the contact current (s3 ') is 10Ia, and the maximum amount of change is 18Ia.

  When m = 20, the contact current (s1 ') is 58Ia, the contact current (s2') is 22Ia, the contact current (s3 ') is 20Ia, and the maximum amount of change is 38Ia.

JP 2011-42272 A

  As the number of groups increases, the contact current (s1 ′) suddenly becomes larger than the contact current (s2 ′) and the contact current (s3 ′) from the total contact current value and the change amount of the contact input unit group 3 described above. It increases and the amount of change also increases. Furthermore, the contact current (s1 ') and the amount of change rapidly increase as the number of contact input units 2 arranged in the contact input unit group 3 increases.

  For this reason, the power supply device that is the DC power supply E needs to have a load performance that can withstand the amount of change in current that rapidly increases and decreases and a capacity that can withstand the contact current (s1 ′) through which the maximum current flows. . Accordingly, there is a problem that the operation cost increases because the power supply device is expensive to satisfy the load performance and capacity, and the power consumption increases.

  The object of the present invention is to solve the above-described problems, and even when a large number of input contacts N are connected, the amount of change in current and the maximum power are kept low, and the open / closed state of the input contacts and failure in the main body An object of the present invention is to provide a contact input control device capable of reliably performing the determination.

  In order to achieve the above object, a contact input control device according to the present invention includes one or more contact input units, a contact input unit group having an edge trigger circuit connected to the contact input unit, and the one or more contact input units. A contact input unit group, and a control unit connected to the contact input unit group. The contact input unit includes a contact voltage input terminal for connecting a positive side of an external DC power source via an input contact, and a negative side of the DC power source. A negative input terminal, an output terminal that outputs a contact input signal to the edge trigger circuit, and an input terminal that inputs an input control signal from the control unit, the control unit, A contact input signal input unit for inputting all contact input signals from the edge trigger circuit via a data bus; an input control signal output unit for outputting an input control signal to the input terminal of the contact input unit; An input address signal decoder for outputting an input address signal to the trigger circuit; and an FB signal input unit for inputting a feedback input control signal from the input control signal output unit. The edge trigger circuit is provided from the control unit. When an input address signal change signal is received, the input contact input signal is output to the control unit via the data bus.

  According to the contact input control device according to the present invention, by checking with the feedback signal whether or not the input control signal to the contact input unit is correctly output from the control unit, to ensure safety and reliability, The amount of change in the contact input current can be reduced and uniform, and the power consumption can be reduced.

It is a block circuit block diagram of a contact input control device. It is a circuit block diagram of an input contact and a contact input part group. It is a flowchart figure of the control part at the time of determining the open / closed state of an input contact with respect to the contact input part group to identify. It is an operation | movement timing chart figure when the input contact of the contact input part group to specify is made into a closed state. It is a circuit block diagram of the contact input control apparatus of a prior art example. It is a block circuit block diagram of the contact input control apparatus of a prior art example. It is a flowchart figure of the control part at the time of determining the open / closed state of an input contact with respect to the contact input part group which a prior art example specifies. The timing chart figure when the input contact of the contact input part group which the prior art example specifies is made into a closed state is shown.

The present invention will be described in detail based on the embodiment shown in FIGS.
FIG. 1 is a block circuit configuration diagram of a contact input control device 1 according to an embodiment. The contact input control device 1 includes one or more contact input units 2 connected to an input contact N, and the contact input unit 2. It is composed of one or more contact input unit groups 3 each having an edge trigger type circuit to be described later, and one control unit 4 connected to the contact input unit group 3.

  One side of the contact input control device 1 is connected to the positive and negative electrodes of the DC power supply E with respect to the contact input unit 2. The positive input of the DC power supply E is connected to the contact input unit 2 via the input contact N. The side is connected. These input contacts N are interlocked with the operation state of the ground system of the railway system such as a traffic light or a switch.

  Further, when a plurality of contact input units 2 are arranged in the contact input unit group 3, positive and negative electrodes of the DC power supply E are connected to each contact input unit 2 in parallel and applied. The positive side of the DC power source E is connected to the unit 2 via the input contact N. In FIG. 1, one DC power source E is branched to each contact input unit 2, but a plurality of DC power sources E may be arranged.

  On the other side of the contact input control device 1, for example, an electronic interlocking device 5 which is a host device is connected. In response to the status information request from the electronic interlocking device 5 such as polling, the contact input control device 1 provides information on the open / closed status of all the input contacts N to be connected, that is, ground devices such as traffic lights and switchboards. And the failure information generated in the contact input unit 2 are responded. Alternatively, information on the open / closed state of the input contact N and failure information on the contact input unit 2 are returned to the electronic interlocking device 5 at predetermined time intervals.

  FIG. 2 is a circuit configuration diagram showing internal circuits of the contact input unit 2 and the contact input unit group 3. The contact input unit 2 includes a contact voltage input terminal 2 a that connects the positive side of the DC power source E via the input contact N, a negative input terminal 2 b that connects the negative side of the DC power source E, and the contact input unit group 3. An output terminal 2c that outputs a contact input signal S1 ′ to the arranged edge trigger type circuit and an input terminal 2d that inputs an input control signal S2 from the control unit 4 are provided.

  Inside the contact input unit 2, a photocoupler P1 including a light emitting diode D1 and a phototransistor T1 and a photocoupler P2 including a light emitting diode D2 and a phototransistor T2 are connected in series. The positive side of the DC power source E from the contact voltage input terminal 2a connected to the input contact N is connected to the negative side of the DC power source E from the negative input terminal 2b through photocouplers P1 and P2.

  The contact voltage input terminal 2a is connected to the anode of the light emitting diode D1 of the photocoupler P1 of the contact input unit 2 via the resistor R1, and the cathode is connected to the collector of the phototransistor T2 of the photocoupler P2. The emitter of the phototransistor T2 is connected to the minus input terminal 2b, and the resistor R2 is connected between the connection point between the resistor R1 and the photocoupler P1 and the minus input terminal 2b.

  The collector of the phototransistor T1 of the photocoupler P1 is connected to the output terminal 2c via the inverting element IC1, and a power supply voltage e of, for example, 5 V is connected between the collector of the phototransistor T1 and the inverting element IC1 via the resistor R3. Applied. The emitter of the phototransistor T1 is connected to 0V.

  A power supply voltage e is applied to the anode of the light emitting diode D2 of the photocoupler P2 via the resistor R4, and the cathode of the light emitting diode D2 is connected to the input terminal 2d.

  When the input control signal S2 is output as the H level from the input control signal output unit 4b of the control unit 4 shown in FIG. 1, it is inverted from the H level to the L level by the inverting element IC2 and input to the input terminal 2d. By making the output of the inverting element IC2 an L level signal, a current flows from the power supply voltage e, and the light emitting diode D2 of the photocoupler P2 emits light.

  At this time, if the input contact N is in a closed state, a current flows through the photocouplers P1 and P2, and the light emitting diode D1 emits light. Then, a current flows through the phototransistor T1, and the inverting element IC1 outputs the contact input signal S1 'inverted from the L level to the H level.

  When the input contact N is open, no current flows through the photocouplers P1 and P2, and the light emitting diode D1 of the photocoupler P1 does not emit light. Therefore, no current flows through the phototransistor T1, and the inverting element IC1 outputs the contact input signal S1 'inverted from the H level to the L level from the output terminal 2c.

  The contact input unit group 3 includes one or more contact input units 2 and includes an edge trigger circuit connected to the contact input units 2, for example, an edge trigger type DFF (D flip-flop) 3a. The edge trigger type DFF 3a is connected to each input D from the output terminal 2c of the contact input unit 2 with the number of bits as the upper limit of the connectable number, and inputs the contact input signal S1 '.

  Further, the edge trigger type DFF 3a inputs the input address signal S3 output from the input address signal decoder unit 4c of the control unit 4 to the clock CK, and inputs the input address signal S3 inverted through the inverting element IC3 to the inverted OC. To do.

  The output data from the output Q respectively corresponding to the input D of the edge trigger type DFF 3a is input contacts N (1-1) to (m) included in the contact input section group 3 of the group number m with the data bus size as a unit group. -N) is an all-contact input signal S1, which is transmitted to the contact input signal input unit 4a via the data bus.

  When a change signal for changing the input address signal S3 from the L level to the H level is input to the clock CK of the edge trigger type DFF 3a, the contact input signal S1 ′ input to the input D of the edge trigger type DFF 3a is output from the output Q. Will be.

  The control unit 4 includes a contact input signal input unit 4a that inputs all contact input signals S1 from each contact input unit group 3 via a data bus, and an input terminal 2d of each contact input unit 2 in the contact input unit group 3. An input control signal output unit 4b for outputting the input control signal S2 to the input, an input address signal decoder unit 4c for outputting the input address signal S3 to the edge trigger type DFF in the contact input unit group 3, and an input control signal output unit 4b includes a feedback (FB) input control signal S2 'and an FB signal input unit 4d for inputting the FB input address signal S3' from the input address signal decoder unit 4c.

  The input control signal output unit 4b of the control unit 4 has an output interface for outputting the input control signal S2 via the inverting element IC2 for each contact input unit group 3, and this input control signal S2 is the inverting element IC2. After inversion, the signal branches and is output to the input terminal 2d of each contact input unit 2 included in the contact input unit group 3. At the same time, an FB input control signal S2 'obtained by feeding back the input control signal S2 of the contact input unit group 3 is output to the FB signal input unit 4d.

  The input address signal decoder 4c of the control unit 4 has an output interface that outputs the input address signal S3 for each contact input unit group 3, and one input that outputs the FB input address signal S3 'to the FB signal input unit 4d. It has an interface.

  The FB signal input unit 4d of the control unit 4 includes an input interface for inputting the FB input control signal S2 ′ of the contact input unit group 3 output from the input control signal output unit 4b, and an output from the input address signal decoder unit 4c. And an input interface for inputting the FB input address signal S3 ′.

  FIG. 3 is a flowchart of the control unit 4 when determining the open / closed state of the input contact N for one specific contact input unit group 3 ′ specified from among the plurality of contact input unit groups 3. FIG. 4 is a timing chart when the input contact of the specific contact input unit group 3 ′ is closed.

  In the operation time chart of FIG. 4 with these time axes as horizontal axes, t1, t2, and t4 indicate output timings of the control unit 4, and t3 and t5 indicate input timings of the control unit 4. s1 to s3 represent steps of the process of the control unit 4, and d in the figure represents an operation delay of the circuit. Further, steps s1 to s3 in FIG. 3 correspond to steps s1 to s3 in FIG. 4, respectively.

  The output process of the input control signal S2, the FB input address signal S3 ′ or the input address signal S3, which is performed at the output timings t1, t2, and t4 from the control unit 4 in FIG. 4, is set in advance. The input control signal S2, the FB input address signal S3 ′, or the input address signal S3 is output according to each output timing.

  Then, the control unit 4 performs input processing with the FB input control signal S2 ′ and the all-contact input signal S1 at the input timings t3 and t5, and the input contact N is opened / closed and the contact input unit 2 or the control unit 4 is broken. Can be determined.

  Step s11 in step s1 outputs output data using the input control signal S2 as an L level signal from the input control signal output unit 4b to the contact input unit group 3 of all groups at the output timing t1.

  In step s12 in step s1, the FB input address signal S3 'is output from the L level signal to the H level signal from the input address signal decoder unit 4c at the output timing t2. Then, at the input timing t3 when the FB input address signal S3 ′ is the H level signal, the FB input control signal S2 ′ of the entire group input to the FB signal input unit 4d and the entire group output from the input control signal output unit 4b It is determined whether or not the input control signal S2 matches.

  By step s12, it can be confirmed by the input of the FB signal input unit 4d whether the output data which is supposed to be output by the input control signal output unit 4b is actually output. If they do not match, there may be a failure or the like in the output interface such as the input control signal output unit 4b.

  Step s13 in step s1 outputs the input address signal S3 from the L level signal to the H level signal only for the specific contact input unit group 3 'at the output timing t4.

  Then, at the input timing t5 in the state of the H level signal of the input address signal S3, the all contact input signal S1 is input to the contact input signal input unit 4a via the data bus, and the specification included in the input all contact input signal S1. It is determined whether or not the contact input signal S1 ″ of the contact input unit 2 in the contact input unit group 3 ′ is an L level signal. If the contact input signal S1 ″ is an L level signal, the process proceeds to step s2, and the H level is reached. In the case of a signal, it is determined that the contact input unit 2 in the specific contact input unit group 3 ′ has a failure.

  If the contact input section 2 in the specific contact input section group 3 ′ is normal, the input control signal S2 from the input control signal output section 4b corresponds to the output of the L level signal, and the photocouplers P1 and P2 of the contact input section 2 Does not start, the contact input signal S1 "is always an L level signal.

  Conversely, when the contact input signal S1 ″ is an H level signal, an H level fixed failure that causes an output abnormality of the H level signal in the contact input unit 2, for example, the phototransistor T2 of the photocoupler P2 fails on the conduction side. There may be a failure in which a current continues to flow from the DC power source E to the contact voltage input terminal 2a of the contact input unit 2 via the resistor R1.

  Step s21 in step s2 is an input control signal from the input control signal output unit 4b to the specific contact input unit group 3 ′ at the output timing t1 and an L level signal to the other contact input unit group 3. S2 is output.

  In step s22 in step s2, the FB input address signal S3 'is output from the L level signal to the H level signal from the input address signal decoder unit 4c at the output timing t2 as in step s12. Then, at the input timing t3 when the FB input address signal S3 ′ is the H level signal, the FB input control signal S2 ′ of the entire group input to the FB signal input unit 4d and the entire group output from the input control signal output unit 4b It is determined whether or not the input control signal S2 matches. If they do not match, there may be a failure or the like in the output interface such as the input control signal output unit 4b.

  Step s23 in step s2 outputs the input address signal S3 from the L level signal to the H level signal only for the specific contact input unit group 3 'at the output timing t4.

  Then, at the input timing t5 in the state of the H level signal of the input address signal S3, the all contact input signal S1 is input to the contact input signal input unit 4a via the data bus, and the specification included in the input all contact input signal S1. It is determined whether or not the contact input signal S1 ″ of the contact input unit 2 in the contact input unit group 3 ′ is at the H level. The output timing t2 and the input timing t5 are determined in consideration of the delay time d of the circuit. Is done.

  If the contact input signal S1 ″ is an H level signal, the process proceeds to step s3. If the contact input signal S1 ″ is an L level signal, the input contact N connected to the contact input unit 2 in the specific contact input unit group 3 ′ is in an open state or a contact input unit. It is determined that the failure is 2nd grade.

  When the input contact N is in the closed state, the photocouplers P1 and P2 of the contact input unit 2 are activated by the output of the H level signal of the input control signal S2, and the specific contact input unit group included in the all contact input signal S1 The contact input signal S1 "of the contact input unit 2 in 3 'is an H level signal. Conversely, when the input contact N is in an open state, the photocouplers P1 and P2 of the contact input unit 2 are not activated and contact input is performed. The signal S1 ″ is an L level signal.

  However, when the contact input signal S1 ″ of the L level signal is input, an L level fixed fault that causes an output error of the L level signal at the contact input unit 2 other than the input contact N being in an open state, for example, the photocoupler P2 photo It is conceivable that the transistor T2 fails on the non-conducting side and no current flows from the DC power source E to the photocouplers P1 and P2 to the contact voltage input terminal 2a of the contact input unit 2.

  In step s31 in step s3, output data with the input control signal S2 as an L level signal is output from the input control signal output unit 4b to the contact input unit group 3 of all groups at the output timing t1 as in step s11. To do.

  In step s32 in step s3, the FB input address signal S3 'is output from the L level signal to the H level signal from the input address signal decoder unit 4c at the output timing t2 as in step s12.

  At the input timing t3 when the FB input address signal S3 ′ is the H level signal, the FB input control signal S2 ′ of the entire group input to the FB signal input unit 4d and the inputs of the entire group output from the input control signal output unit 4b It is determined whether or not the control signal S2 matches. If they do not match, there may be a failure or the like in the output interface such as the input control signal output unit 4b.

  Step s33 in step s3 outputs the input address signal S3 from the L level signal to the H level signal only for the specific contact input unit group 3 'at the output timing t4. Then, at the input timing t5 in the state of the H level signal of the input address signal S3, the all contact input signal S1 is input to the contact input signal input unit 4a via the data bus, and the specification included in the input all contact input signal S1. It is determined whether or not the contact input signal S1 ″ of the contact input unit 2 in the contact input unit group 3 ′ is an L level signal. Note that the output timing t2 and the input timing t5 consider the circuit delay time d. Determined.

  When the contact input signal S1 ″ is an L level signal, it is determined that the input contact N connected to the contact input unit 2 in the specific contact input unit group 3 ′ is in a closed state. Is determined as an H-level fixed failure in which an output abnormality of the H-level signal occurs in the contact input unit 2 in the specific contact input unit group 3 ′ in the same manner as in step s13. This is performed in units of three contact input unit groups.

  Subsequently, the reduction effect of the contact current total value and the amount of change when the processes of steps s1 to s3 are performed will be described. In the contact input unit 2, when the input contact N is closed and the L-level input control signal S <b> 2 is received, a current Ia caused by the resistors R <b> 1 and R <b> 2 flows through the input contact N. On the other hand, when the input contact N is closed and the H-level input control signal S2 is received, the current Ib from the resistor R1 flows through the input contact N. When R1: R2 = 1: 2, current Ia: current Ib = 1: 3.

  For example, when one input contact N and contact input unit 2 are arranged in each of the contact input unit groups 3 with the number of groups being m, and all these input contacts N are in a closed state, the input contact N The total value of the contact current flowing through is calculated.

The contact current when the input control signal S2 of the specific contact input unit group 3 ′ and the other contact input unit group 3 in step s1 is set to the L level is as follows.
Contact current of specific contact input unit group 3 ′ = Ia
Contact current of other contact input unit group 3 = (m−1) Ia
Total contact current (s1) = Ia + (m−1) Ia = mIa

The contact current when the input control signal of the specific contact input unit group 3 ′ in step s2 is set to the H level and the input control signal S2 of the other contact input unit group 3 is set to the L level is as follows.
Contact current of specific contact input unit group 3 ′ = Ib
Contact current of other contact input unit group 3 = (m−1) Ia
Total contact current (s2) = Ib + (m−1) Ia = (m + 2) Ia

The contact current when the input control signal S2 of the specific contact input unit group 3 ′ and the other contact input unit group 3 in step s3 is set to the L level is as follows.
Contact current of specific contact input unit group 3 ′ = Ia
Contact current of other contact input unit group 3 = (m−1) Ia
Total contact current (s3) = Ia + (m−1) Ia = mIa

Here, for example, when the contact current total value and the amount of change when m = 1, m = 10, and m = 20 are calculated,
When m = 1, the contact current (s1) is Ia, the contact current (s2) is: 3Ia, the contact current (s3) is Ia, and the maximum amount of change is 2Ia.

  When m = 10, the contact current (s1) is 10 Ia, the contact current (s2) is 12 Ia, the contact current (s3) is 10 Ia, and the maximum amount of change is 2 Ia.

  When m = 20, the contact current (s1) is 20 Ia, the contact current (s2) is 22 Ia, the contact current (s3) is 20 Ia, and the maximum amount of change is 2 Ia.

  As is apparent from the above description, the contact current total value according to the present invention has a proportional relationship with the increase in the number of groups m because the contact current (s1) is greatly reduced compared to the conventional contact current total value. To establish. Also, the amount of change in the contact current total value is irrelevant to the increase in the number of groups m, and the amount of change is uniform.

  Thereby, in the power supply device which is the DC power supply E, the load performance and capacity restrictions are relaxed as compared with the conventional one, and the power consumption is also reduced, so that the operation cost can be reduced.

  In the present embodiment, the closed state of the input contact N is determined using steps s1 to s3. However, there is no problem even if only steps s1 and s2 or steps s2 and s3 are used. In the case of only steps s1 and s2, when the contact input signal S1 ″ in step s23 is at the H level, it is determined that the input contact N is in a closed state. Also, in the case of only steps s2 and s3. Starts from step s21.

  In the present embodiment, compared to the conventional contact current total value and change amount, the contact current total value can be reduced, the change amount can be made uniform, and the power consumption can be reduced. In addition, a power supply device having a smaller current capacity than that of the conventional example can be adopted and can be operated at low cost.

DESCRIPTION OF SYMBOLS 1 Contact input control device 2 Contact input part 2a Contact voltage input terminal 2b Negative input terminal 2c Output terminal 2d Input terminal 3 Contact input part group 3 'Specific contact input part group 3a Edge trigger type DFF
4 control unit 4a contact input signal input unit 4b input control signal output unit 4c input address signal decoder unit 4d FB signal input unit E DC power supply

Claims (8)

A contact input unit group including an edge trigger circuit connected to the contact input unit, including one or more contact input units, and one control unit connected to the one or more contact input unit groups;
The contact input unit includes a contact voltage input terminal for connecting a positive side of an external DC power source via an input contact, a negative input terminal for connecting a negative side of the DC power source, and a contact input to the edge trigger circuit. An output terminal for outputting a signal, and an input terminal for inputting an input control signal from the control unit;
The control unit inputs a contact input signal from the edge trigger circuit via a data bus, and an input control signal output that outputs an input control signal to the input terminal of the contact input unit An input address signal decoder unit that outputs an input address signal to the edge trigger circuit, and an FB signal input unit that inputs a feedback input control signal from the input control signal output unit,
When the edge trigger circuit receives a change signal of an input address signal from the control unit, the edge trigger circuit outputs the input contact input signal to the control unit via the data bus.   The contact input control device according to claim 1, wherein the input contact is linked to an operation state of a ground device of a railway system.   The control unit compares the input control signal output from the input control signal output unit with a feedback input control signal input from the FB signal input unit, and determines a failure of the control unit. The contact input control device according to claim 1 or 2.   Output one input control signal as an L level signal from the input control signal output unit to one specific contact input unit group to be specified from among the plurality of contact input unit groups, and another contact input unit group, Based on the contact input signal of the specific contact input unit group in the all contact input signal input to the contact input signal input unit, an output failure of the H level signal of the contact input unit in the specific contact input unit group The contact input control device according to claim 3, wherein it is determined that there is.   When the contact input signal of the specific contact input unit group is an L level signal, the input control signal is set to an H level signal for the specific contact input unit group, and the input control signal is set to an L level for the other contact input unit group. L level of the contact input unit in the specific contact input unit group based on the contact input signal of the specific contact input unit group output from the input control signal output unit as a signal and input by the contact input signal input unit 5. The contact input control device according to claim 4, wherein a signal output failure or the input contact connected to the contact input unit in the specific contact input unit group is determined to be in an open state.   When the contact input signal of the specific contact input unit group is an H level signal, the input control signal is output as an L level signal to the specific contact input unit group and the other contact input unit group. The input contact connected to the contact input unit in the specific contact input unit group is closed based on the contact input signal of the specific contact input unit group output from the unit and input by the contact input signal input unit The contact input control device according to claim 5, wherein the contact input control device is determined.   The contact input unit includes a first photocoupler connected to the output terminal and a second photocoupler connected to the input terminal, and the first and second photocouplers are connected in series. The contact input control device according to claim 1, wherein the contact input control device is one of the following.   The contact input control device according to claim 7, wherein the contact voltage input terminal is connected to the minus input terminal via the first and second photocouplers.

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