JP5137921B2 - Input control device - Google Patents

Description

  The present invention relates to an input control device such as 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 that use a certain order and restrictions on the handling of traffic lights and switchboards are used. An input device is used as shown in Patent Document 1 in order to capture the operation state of field equipment such as a traffic light and a switch machine via a relay.

  As shown in FIG. 6, the input device 30 disclosed in Patent Document 1 includes a first resistor R <b> 1 between input terminals that captures the operating state of field equipment via an input contact 6 connected to a DC power supply 5. , The second resistor R2, the phototransistor of the first photocoupler P1, and the LED of the second photocoupler P2 are connected in series, and the first resistor R1, the third resistor R3, and the second photocoupler are connected. The phototransistor of the coupler P2 and the LED of the third photocoupler P3 are connected in series. A positive power supply voltage is applied to the anode of the LED of the first photocoupler P1, and the cathode is connected to an input terminal for inputting an on / off signal that is a fail-safe inspection signal from the electronic interlocking device 20. The collector of the phototransistor of the third photocoupler P3 is connected to an output terminal for sending an output signal to the electronic interlocking device 20, and the emitter is grounded.

  When the input contact 6 is closed, when the fail-safe inspection signal is turned on, the first photocoupler P1 is turned on and the second photocoupler P2 is turned on. When the second photocoupler P2 is turned on, the third photocoupler P3 is turned on and an output signal is output to the electronic interlocking device 20 through the output terminal. When the fail-safe inspection signal is turned off, the first photocoupler P1 is turned off, and the second photocoupler P2 and the third photocoupler P3 are turned off to cut off the output signal.

  In this input device 30, when the input contact 6 is closed, for example, when the third resistor R3 fails and is fixed in the open state, either when the fail-safe inspection signal is turned on or off. The third photocoupler P3 is turned off, and the electronic interlocking device 20 determines that there is no input.

  In the input device 30 shown in Patent Document 1, when the input contact 6 is closed, the output signal of the third photocoupler P3 is turned on in response by turning on and off the fail-safe inspection signal. When the electronic interlocking device 20 is turned off, the electronic interlocking device 20 determines that “input is present”. When the input contact 6 is open, the third photocoupler P3 is off regardless of whether the fail-safe inspection signal is on or off. In either case, a fixed failure occurs on the contact current input side. It was not possible to determine whether the input contact 6 was open and there was no contact input. That is, when the input device 30 is in the “input” side state (referred to as the H side) on the information “1” side, a fixed failure is detected, but the “no input” side state is detected on the information “0” side. In the case of (L side), it was impossible to distinguish between fixed fault and no input.

  The present invention solves such a problem and provides an input control device that improves the reliability by correctly detecting whether or not a failure has occurred regardless of whether the input contact is open or closed. It is intended to do.

The input control device for railway signal security control according to the present invention is configured to convert a contact signal indicating an open / closed state of an input contact representing an operation state of a device into a signal that can be processed by an electronic interlocking device for railway signal security control. In the input control device that outputs to the interlocking device, the L-side failure inspection unit has a contact signal input unit and a control logic unit, and the L-side failure inspection unit inputs the inspection control signal output from the control logic unit. A signal input unit, and a test signal unit that generates a test output signal corresponding to the contact signal indicating the closed state of the input contact based on the test control signal and outputs the test signal to the contact signal input unit, The unit receives a control signal input unit that inputs an input control signal output from the control logic unit, an inspection signal input unit that inputs an inspection output signal output from the L-side fault inspection unit, and an input control signal And turn on the second The first photocoupler that is turned on when the photocoupler and the contact signal indicating the closed state of the input contact are input and the second photocoupler is turned on, and the contact input to the control logic unit when the first photocoupler is turned on An output unit that outputs a signal, and outputs a contact input signal based on an input control signal input from the control logic unit and an inspection output signal input from the L-side fault inspection unit to the control logic unit, When the contact signal input unit is inspected, the unit outputs an input control signal to the contact signal input unit, outputs an inspection control signal to the L side failure inspection unit, and contacts the inspection output signal output by the L side failure inspection unit. A contact input signal from the signal input unit is read, and the presence or absence of an L-side failure that fixes that there is no contact signal input in the contact signal input unit is determined.

  The contact signal input unit includes a first photocoupler and a second photocoupler, wherein the LED of the first photocoupler and the phototransistor of the second photocoupler are connected in series, and the first photocoupler A contact signal from the external contact is input through a series circuit of an LED of a photocoupler and a phototransistor of the second photocoupler, and an inspection output signal from the L-side fault inspection unit is input, and the second output An input control signal is input via an LED of a photocoupler, and a contact input signal is output via a phototransistor of the first photocoupler.

  The control logic unit performs control processing in order of inspection processing and input processing at a constant processing cycle, and in the inspection processing, outputs an input control signal and outputs an inspection control signal to read a contact input signal, and the input processing Then, an input control signal is output and a contact input signal is read.

  In the present invention, when an input control signal is output from the control logic unit, the contact signal input unit outputs a contact input signal based on the contact signal from the external contact to the control logic unit, and the input signal from the control logic unit. Since the contact signal input unit outputs a contact input signal based on the input control signal and the inspection output signal generated by the inspection control signal in the L-side failure inspection unit to the control logic unit. The control logic unit can correctly detect the presence or absence of a failure in the contact signal input unit even when the contact signal from the external contact is not input to the contact signal input unit. The presence or absence of input can be detected, and the reliability can be improved.

It is a block diagram which shows the structure of the input control apparatus of this invention. It is a circuit diagram which shows the structure of a contact signal input part and a L side fault test | inspection part. It is a processing procedure figure which shows the processing procedure of a control logic part. It is a time chart which shows a process when an input contact is open | released and a contact signal input part is a normal state. It is a time chart which shows a process when an input contact is closed and a contact signal input part is in a normal state. It is a circuit diagram which shows the structure of the conventional input device.

  FIG. 1 is a block diagram showing the configuration of the input control apparatus of the present invention. As shown in the figure, the input control device 1 has a contact signal input unit 2, an L-side fault inspection unit 3, and a control logic unit 4, and the DC power supply 5 indicates the operating state of field devices such as traffic lights and switchboards. Is taken in via the input contact 6 connected to the, and output to the electronic interlocking device 20.

  As shown in the circuit diagram of FIG. 2, the contact signal input unit 2 includes a first photocoupler P <b> 1 and a second photocoupler P <b> 2, and input terminals 7 a and 7 b connected to the input contact 6 and the DC power supply 5. An output terminal 8 for outputting a contact input signal to the control logic unit 4, a control signal input terminal 9 for inputting an input control signal output from the control logic unit 4, and an inspection output from the L-side fault inspection unit 3. Inspection signal input terminals 10a and 10b for inputting output signals are provided.

  The LED of the first photocoupler P1 has an anode connected to the input terminal 7a via a resistor R1, a diode D1, and a resistor R2, and a cathode connected to the collector of the phototransistor of the second photocoupler P2. The emitter of the phototransistor of the second photocoupler P2 is connected to the input terminal 7b via the diode D2. A voltage dividing resistor R3 is connected between the connection point of the resistor R1 and the diode D1 and the input terminal 7b to reduce noise applied to the LED of the first photocoupler P1. In addition, a diode D3 for bypassing the reverse current is connected in parallel with the LED of the first photocoupler P1 and the phototransistor of the second photocoupler P2. Further, the inspection signal input terminal 10a is connected to the connection point between the diode D1 and the resistor R2, and the inspection input terminal 10b is connected to the emitter of the phototransistor of the second photocoupler P2.

  The collector of the phototransistor of the first photocoupler P1 is connected to the output terminal 8 via the inverting element IC1 and a positive power supply voltage is applied via the resistor R4. A positive power supply voltage is applied to the anode of the LED of the second photocoupler P2 via the resistor R5, and the cathode is connected to the control signal input terminal 9 via the inverting element IC2.

  The L side failure inspection unit 3 detects whether the contact signal is not input or the L side of the contact signal input unit 2 is in a fixed failure state when the input contact 6 is open. As shown in FIG. 2, the control logic unit includes two exclusive OR elements IC3, an exclusive OR element IC4, an inverting element IC5, capacitors C1 to C4, and a pulse transformer PT having the same phase. An inspection control signal input terminal 11 for inputting an inspection control signal output from 4 and inspection signal output terminals 12a and 12b for outputting an inspection output signal to the contact signal input unit 2 are provided.

  The input side of the inverting element IC5 is connected to the inspection control signal input terminal 11, and the output side is connected to one input side of the exclusive OR element IC3 and the exclusive OR element IC4. A positive power supply voltage is applied to the other input side of the exclusive OR element IC3, and the other input side of the exclusive OR element IC4 is grounded. The output side of the exclusive OR element IC3 is connected to one of the primary sides of the pulse transformer PT via the capacitor C3, and the output side of the exclusive OR element IC4 is connected to the primary side of the pulse transformer PT via the capacitor C4. Is connected to the other of the two. The secondary side of the pulse transformer PT is connected to inspection signal output terminals 12a and 12b via capacitors C1 and C2. The capacitors C1 and C2 prevent a DC voltage from wrapping around from the contact signal input unit 2. The pulse transformer PT DC-insulates the pulse signal and outputs it as an inspection output signal.

  As shown in the processing procedure diagram of FIG. 3, the control logic unit 4 performs control processing in the order of inspection processing, input processing, and other processing at a constant processing cycle. In the inspection process, an input control signal is output to the contact signal input unit 2, an inspection control signal is output to the L-side failure inspection unit 3, the contact input signal is read from the contact signal input unit 2, and the contact input is input to the contact signal input unit 2. Whether or not a fixed failure has occurred in the contact signal input section 2 is inspected even in the state of none. In the input process, an input control signal is output to the contact signal input unit 2 to read the contact input signal.

  Processing when the input control device 1 captures a contact signal from the input contact 6 will be described with reference to the time chart of FIG. 4 and the time chart of FIG. FIG. 4 shows a normal case when the input contact 6 is open, and FIG. 5 shows a normal case when the input contact 6 is closed.

  The control logic unit 4 executes the control process in the order of the inspection process, the input process, and the other processes every fixed processing cycle T. In the inspection process, as shown in FIGS. 4 and 5, the input control signal and the inspection control signal are simultaneously changed from “0” to “1” and output to the contact signal input unit 2 and the L-side fault inspection unit 3. After the input control signal and the inspection control signal are output, the contact input signal output from the contact signal input unit 2 is read at a timing in consideration of the circuit delay in the L-side failure inspection unit 3 and the contact signal input unit 2.

  When “1” is input as an input control signal to the control signal input terminal 9 in the contact signal input unit 2, the inverting element IC2 connected to the control signal input terminal 9 sets the output to “0” and the second photocoupler P2. A current is passed through the LED to emit light, and the phototransistor is turned on. On the other hand, when “1” is input as the inspection control signal to the inspection control signal input terminal 11 of the L-side fault inspection unit 3, the inverting element IC5 connected to the inspection control signal input terminal 11 sets the output to “0”. When the output of the inverting element IC5 becomes “0”, the output of the exclusive OR element IC3 becomes “1”, the output of the exclusive OR element IC4 becomes “0”, and the pulse transformer PT changes “0” to “0”. The inspection output signal set to “1” is output to the contact signal input unit 2. When the inspection output signal is input to the contact signal input unit 2, as shown in FIG. 4, even if the contact signal from the input contact 6 is not input to the contact signal input unit 2 with the input contact 6 opened, the contact The inspection output signal input to the signal input unit 2 flows through the resistor R2, the LED of the first photocoupler P1 and the phototransistor of the second photocoupler P2, and causes the LED of the first photocoupler P1 to emit light to cause a photo. Turn on the transistor. When the phototransistor of the first photocoupler P1 is turned on, the output of the inverting element IC1 is changed from “0” to “1”, and “1” is output from the output terminal 8 to the control logic unit 4 as a contact input signal. The control logic unit 4 outputs the input control signal and the inspection control signal from “0” to “1” at the same time, and then inputs the contact signal at a timing considering the circuit delay in the L-side fault inspection unit 3 and the contact signal input unit 2. When the contact input signal output from the unit 2 is read and the input control signal and the inspection control signal are set to “1” and output, the contact signal input unit 2 reads “1” as the contact input signal. It is determined that there is no L side failure.

  Further, when a fixed failure occurs in the resistor R2 of the contact signal input unit 2, the LED of the first photocoupler P1, the phototransistor circuit of the second photocoupler P2, or the LED of the second photocoupler P2, etc. Even if “1” is input as an inspection output signal from the L-side fault inspection unit 3, the phototransistor of the first photocoupler P1 is not turned on, and the output of the inverting element IC1 remains “0”. When the control logic unit 4 reads the input control signal and the inspection control signal as “1” and reads “0” as the contact input signal at a predetermined timing, the control logic unit 4 reads “L side failure It is determined that it has occurred.

  In this way, the control logic unit 4 outputs the input control signal and the inspection control signal from “0” to “1”, and reads the contact input signal at a predetermined timing, whereby the contact signal input unit 2 is contacted. Even when there is no signal input, it is possible to determine whether or not a failure has occurred on the L side of the contact signal input unit 2.

  When the control logic unit 4 outputs “1” as the input control signal and the inspection control signal, it reads “1” as the contact input signal, and inputs when the contact signal input unit 2 determines “no L side failure”. The control signal and the inspection control signal are output from “1” to “0”, and then the contact input signal output from the contact signal input unit 2 is read at a predetermined timing. When the inspection control signal input to the L-side fault inspection unit 3 changes from “1” to “0”, the inspection output signal changes from “1” to “0”. When the input control signal input to the contact signal input unit 2 changes from “1” to “0”, the current flowing through the LED of the second photocoupler P2 is cut off, and the phototransistor is turned off. When the phototransistor of the second photocoupler P2 is turned off, the current flowing through the LED of the first photocoupler P1 is interrupted to turn off the phototransistor. When the phototransistor of the first photocoupler P1 is turned off, the contact input signal output from the inverting element IC1 is changed from “1” to “0”. When the control logic unit 4 outputs the input control signal and the inspection control signal from “1” to “0” and reads “0” as the contact input signal at a predetermined timing, the contact signal input unit 2 “ It is determined that there is no failure on the H side.

  The control logic unit 4 outputs the input control signal and the inspection control signal from “1” to “0” and outputs the contact signal input unit when the contact input signal read at a predetermined timing is “1”. 2, it is determined that an H-side failure has occurred due to, for example, a short circuit of the phototransistor of the first photocoupler P1.

  The control logic unit 4 outputs the input control signal and the inspection control signal from “1” to “0” and reads “0” as a contact input signal at a predetermined timing. The contact signal input unit 2 If it is determined that “no failure on the H side”, input processing is performed. In the input processing, the input control signal is changed from “0” to “1” and output with the inspection control signal set to “0”. When the contact signal input unit 2 inputs “1” as an input control signal, the LED of the second photocoupler P2 emits light and turns on the phototransistor. If no contact signal is input to the contact signal input unit 2 with the input contact 6 opened in this state, the contact input signal output from the inverting element IC1 becomes “0” as shown in FIG. ing. When the control logic unit 4 outputs the input control signal from “0” to “1” and reads “0” as the contact input signal, it determines “no contact input” and outputs it to the electronic interlocking device 20. The signal is controlled to “0” on the safe side.

  Further, when the control logic unit 4 outputs the input control signal from “0” to “1” and the input contact 6 is closed and the contact signal input unit 2 receives a contact signal, As a current flows through the LED of the first photocoupler P1 of the signal input unit 2 to turn on the phototransistor, the contact input signal output from the inverting element IC1 is changed from “0” to “1” as shown in FIG. " When the control logic unit 4 outputs “1” as an input control signal, it reads “1” as a contact input signal and determines “contact input present” and “no L side failure”.

  Further, when the control logic unit 4 outputs the input control signal from “0” to “1” and reads “0” as the contact input signal, “no contact input” and “no failure on the H side”. judge.

  When the control logic unit 4 outputs the input control signal from “0” to “1”, it reads “1” as the contact input signal, determines that “contact input is present”, and then sets the input control signal to “1”. From “0”, the contact input signal output from the contact signal input unit 2 is read at a predetermined timing. When the read contact input signal is “0”, the control logic unit 4 determines that “contact signal input is normal”, and when the contact input signal is “1”, the control logic unit 4 sends, for example, a first photo signal to the contact signal input unit 2. It is determined that an H-side failure has occurred due to a short circuit of the phototransistor of the coupler P1, and the signal output to the electronic interlocking device 20 is controlled to “0” on the safe side.

  In this way, it is possible to determine whether or not the contact signal input unit 2 has failed even when the input contact 6 is open or closed, and whether the input contact 6 has failed or not. It is possible to determine whether there is no contact signal input after being opened.

DESCRIPTION OF SYMBOLS 1; Input control apparatus, 2; Contact signal input part, 3; L side fault inspection part, 4; Control logic part,
5; DC power supply, 6; input contact, P1, P2; photocoupler, IC1, IC2; inverting element,
IC3, IC4: exclusive OR element, IC5: inverting element, PT: pulse transformer,
R1-R5; resistors, D1-D3; diodes, C1-C4; capacitors.

JP-A-8-80851

Claims (3)

In the input control device that outputs the contact signal indicating the open / closed state of the input contact indicating the operation state of the device to the electronic interlocking device as a signal that can be processed by the electronic interlocking device for railway signal security control,
L side fault inspection unit, contact signal input unit and control logic unit,
The L-side fault inspection unit corresponds to an inspection control signal input unit that inputs an inspection control signal output from the control logic unit, and the contact signal that indicates a closed state of the input contact based on the inspection control signal A test signal unit that generates a test output signal to be output to the contact signal input unit, and
The contact signal input unit includes a control signal input unit that inputs an input control signal output from the control logic unit, an inspection signal input unit that inputs the inspection output signal output from the L-side fault inspection unit, A second photocoupler that is turned on when the input control signal is input, and a first photocoupler that is turned on when the contact signal indicating the closed state of the input contact is input and the second photocoupler is turned on. A coupler, and an output unit that outputs a contact input signal to the control logic unit when the first photocoupler is turned on, the input control signal input from the control logic unit and the L-side fault inspection unit a contact input signal based on the test output signal to be input and outputs to the control logic unit from,
The control logic unit outputs an input control signal to the contact signal input unit and outputs the inspection control signal to the L side failure inspection unit when the contact signal input unit is inspected, and the L side failure inspection unit. The contact input signal from the contact signal input unit is read with respect to the inspection output signal output from the device, and the presence or absence of an L-side failure that fixes the absence of the contact signal input in the contact signal input unit is determined. An input control device for railway signal security control . The LED of the first photocoupler and the phototransistor of the second photocoupler are connected in series, and the external circuit is connected via a series circuit of the LED of the first photocoupler and the phototransistor of the second photocoupler. Input a contact signal from the contact and input an inspection output signal from the L-side fault inspection unit,
The railroad signal security control according to claim 1, wherein an input control signal is input through an LED of the second photocoupler, and a contact input signal is output through a phototransistor of the first photocoupler. input control device for use. The control logic unit performs control processing in order of inspection processing and input processing at a constant processing cycle, and the inspection processing outputs the input control signal and outputs the inspection control signal to read the contact input signal, The input control device for railway signal security control according to claim 1 or 2, wherein the input process outputs the input control signal and reads the contact input signal.

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