JP5116736B2 - Contact input control device and contact input control method - Google Patents

Description

  The present invention relates to a contact input control device such as an electronic interlocking system for railway signal security control and a contact input control method.

  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 and Patent Document 2 in order to capture the operating state of field devices such as traffic lights and switchboards via this relay.

  As shown in FIG. 5, the input device 20 disclosed in Patent Literature 1 includes a first contact 22 a and a second contact 22 b connected to the output side of the input contact 6 connected to the power supply circuit 21. A relay 22, a first resistor R11 connected to the first contact 22a, a second resistor R21 having a resistance value greater than that of the first resistor R11 and connected to the second contact 22b; The digital input circuit 23 is connected to the first resistor R11 and the second resistor R21, and the on-delay circuit 24 is connected to the digital input circuit 23. When the input contact 6 is closed, a first current flows through the first contact 22a and the first resistor R11, and the oxide film and the sulfide film formed on the surface of the input contact 6 are destroyed and the input contact 6 is excellent. Keep in contact. After a predetermined time delay after the first current flows into the digital input circuit 23, the on-delay circuit 24 switches the switching relay 22 from the first contact 22a to the second contact 22b, and the second contact 22b and the second resistor The current consumption is suppressed by flowing a second current having a smaller current value than the first current through R21.

  Further, as shown in FIG. 6, the input device 30 disclosed in Patent Document 2 has a first input terminal that takes in the operating state of the field device via the input contact 6 connected to the power supply device 5. The resistor R1, 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 via a resistor, and the cathode is connected from the electronic interlocking device 10. Is connected to an input terminal for inputting an on / off signal, which is a fail-safe test signal, and the collector of the phototransistor of the third photocoupler P3 sends an output signal to the electronic interlocking device 10. A positive supply voltage through the resistor as well as connected to the output terminal is applied to issue, has the emitter 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 10 via 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 third resistor R3 fails and is fixed in the open state, the third photocoupler P3 is turned off regardless of whether the fail-safe inspection signal is turned on or off. The output signal becomes zero and the electronic interlocking device 10 determines that there is no input.

  In the input device 20 shown in Patent Document 1, since current continuously flows through the input contact 6 when the input contact 6 is closed, power is unnecessarily consumed regardless of the input processing timing of the device. The temperature may increase, and the reliability and life of the device may be reduced.

  On the other hand, the input device 30 shown in Patent Document 2 unnecessarily powers the input contact 6 in a state where the input contact 6 is closed so that a current flows through the input contact 6 in accordance with the input processing timing of the device. However, since the oxide film or sulfide film formed on the surface of the input contact 6 is not destroyed, the input contact 6 may not be kept in a good contact state.

  This invention solves such a problem, performs a process of destroying an oxide film or a sulfide film formed on the surface of the input contact while flowing current to the input contact in accordance with the input processing timing of the electronic interlocking device, and It is an object of the present invention to provide a contact input control device and a contact input control method that can surely shift to a safe side and ensure fail-safe even when a failure occurs.

  The contact input control device of the present invention has an input circuit control unit and an input circuit unit connected to an external input contact and a control logic unit. The input circuit control unit receives “1” as a control signal from the control logic unit. ”Is input, a contact input current from an external input contact is supplied to the input circuit unit. When the contact input current is flowing, the input circuit unit sets the contact input signal to“ 1 ”. When the contact input current is not flowing, the contact input signal is set to “0” and output to the control logic unit. The control logic unit is configured to contact the contact film in a time-division manner with a constant processing cycle. It has a contact input control processing function for switching the control signal in the order of the breakdown step, the contact input step, and the current interruption step. In the film breakdown step, the control signal is continuously set to “1” and output to the input circuit control unit. And before In the contact input step, the control signal is switched to “0”, “1”, “0” for a short time and output to the input circuit control unit. In the current cutoff step, the control signal is continuously set to “0” for a certain time. Output to the input circuit control unit, read a contact input signal output from the input circuit unit, and perform contact input control processing.

  When the control logic unit outputs “1” as a control signal in the contact input step, the control logic unit inputs “0” as a contact input signal from the input circuit unit and “0” as a control signal. When outputting, when "1" is continuously input as a contact input signal from the input circuit unit, the signal output to the external device is controlled to the safe side.

  The input circuit control unit includes a photocoupler including an LED that inputs a control signal from the control logic unit and a phototransistor, and the input circuit unit inputs a contact from an external contact input unit having an input contact. An LED connected between the input terminals for inputting current via the phototransistor of the photocoupler of the input circuit control unit, and a photocoupler made of a phototransistor connected to the output terminal for outputting the contact input signal. Features.

The contact input control method of the present invention includes an input circuit control unit and an input circuit unit connected to an external input contact and a control logic unit. The input circuit control unit receives “1” as a control signal from the control logic unit. ”Is input, a contact input current from an external input contact is supplied to the input circuit unit. When the contact input current is flowing, the input circuit unit sets the contact input signal to“ 1 ”. When the contact input current is not flowing, the contact input signal is set to “0” and output to the control logic unit, and the control logic unit outputs the contact input signal from the input circuit unit. Is a contact input control method in a contact input control device that reads a signal and performs contact input control processing, in which the control logic unit continuously sets a control signal to “1” and outputs it to the input circuit control unit. communicating to said external input contact And the film breaking step of flowing a current to a control signal for a short time "0", "1", the current to the external input contact and output to the input circuit control unit switches to "0" intermittently A contact input step for flowing and a current cut-off step for interrupting the current flowing to the external input contact by setting the control signal to “0” continuously for a certain time and outputting it to the input circuit control unit at a constant processing cycle. It is characterized by being executed in division.

  In the present invention, when reading a contact input current from an external input contact, the control logic unit continuously applies a current to the input contact to destroy the oxide film or sulfide film on the surface of the input contact; , Time division of the contact input step that reads the contact input current from the input contact by intermittently flowing current to the input contact and the current interruption step that interrupts the current flowing to the input contact continuously for a certain period of time As a result, the surface film of the input contact can be reliably destroyed and unnecessary power consumption can be avoided, thereby saving energy.

  The control logic unit outputs “1” as the control signal in the contact input step, when “0” is input as the contact input signal, and “0” is output as the control signal. When "1" is continuously input as the contact input signal, the fixed failure that continues continuously to the input circuit control unit and the input circuit unit is controlled by controlling the signal output to the external device to the safe side. If it occurs, it can be reliably controlled to “0” on the safe side.

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 an input circuit part and an input circuit control part. It is a processing procedure figure which shows the input control processing of a control logic part. It is a time chart which shows an input control process. It is a block diagram which shows the structure of the conventional input device. It is a circuit diagram which shows the structure of the other 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 an input circuit unit 2, an input circuit control unit 3, and a control logic unit 4, and the operation state of field devices such as traffic lights and switchboards is relayed via a relay. Capture and output to the electronic interlocking device 10.

  As shown in the circuit diagram of FIG. 2, the input circuit unit 2 has a photocoupler P1, and the input circuit control unit 3 also has a photocoupler P2. The photocoupler P1 of the input circuit unit 2 includes an anode of the LED connected to the input terminal 7 via the first resistor R1 and the second resistor R2, and a cathode of the LED of the photocoupler P2 included in the input circuit control unit 3. Connected to the collector of the phototransistor. A voltage dividing resistor R3 is connected between the connection point of the first resistor R1 and the second resistor R2 and the cathode of the LED of the photocoupler P1, thereby reducing noise applied to the LED of the photocoupler P1. A diode D for bypassing the reverse current is connected in parallel with the LED of the photocoupler P1. The collector of the phototransistor of the photocoupler P1 is connected to the output terminal 8 via an inverter IC1 that is an inverting element, and the emitter is grounded.

  The emitter of the phototransistor of the photocoupler P2 included in the input circuit control unit 3 is connected to the DC power supply 5, a positive power supply voltage of, for example, plus 5V is applied to the collector of the LED via a resistor, and the emitter is connected via the inverter IC2. The control signal input terminal 9 is connected.

  The control logic unit 4 performs input control processing at a constant processing cycle, switches the control signal between “1” and “0”, and outputs the control signal to the control signal input terminal 9 of the input circuit control unit 3. As shown in the process sequence diagram of FIG. 3, this input control process comprises a processing cycle T composed of a contact film breaking step S1, a contact input step S2, and a current interrupting step S3, and is repeated every fixed processing cycle T. Executed.

Processing when the input control device 1 takes in the contact input of the input contact 6 will be described.
When “1” is output as a control signal from the control logic unit 4 to the control signal input terminal 9 of the input circuit control unit 3, the output of the inverter IC 2 is changed from “1” to “0”, and a current is supplied to the LED of the photocoupler P 2. Flows to turn on the phototransistor of the photocoupler P2. If the input contact 6 is closed when the phototransistor of the photocoupler P2 is turned on, the current from the input contact 6 flows to the LED of the photocoupler P1 of the input circuit unit 2, and the phototransistor of the photocoupler P1 is turned on. Let When the phototransistor of the photocoupler P1 is turned on, the output of the inverter IC1 changes from “0” to “1”, and the contact input signal output from the output terminal 8 is set to “1”. When the control logic unit 4 outputs “1” as a control signal to the input circuit control unit 3, when “1” is input as the contact input signal from the input circuit unit 2, “contact input from the input contact 6 is performed. It is determined as “Yes”.

  Further, when “1” is output as the control signal from the control logic unit 4, “0” is output as the contact input signal from the input circuit 2 when the input contact 6 is opened. The control logic unit 4 determines “no contact input” when “0” is input as the contact input signal from the input circuit unit 2 when “1” is output as the control signal.

  When “1” is output as a control signal from the control logic unit 4, the wiring between the input contact 6 and the input circuit unit 2 or the first resistor R 1 and the second resistor R 2 of the input circuit unit 2 If a failure occurs in the LED of the photocoupler P1 and the phototransistor circuit of the photocoupler P2 of the input circuit control unit 3 and no current flows, “0” is output from the input circuit 2 as a contact input signal. The control logic unit 4 determines “no contact input” when “0” is input as the contact input signal from the input circuit unit 2 when “1” is output as the control signal.

  Further, when “0” is output as the control signal from the control logic unit 4, if “1” is continuously output from the input circuit 2 as the contact input signal, the control logic unit 4 is sent to the input circuit unit 2. It is determined that a continuous fixed failure has occurred on the contact input signal “1” side, and “no contact input” is determined.

  As described above, when the control logic unit 4 outputs “1” as the control signal, when “0” is input as the contact input signal from the input circuit unit 2 and “no contact input” is determined, and as the control signal, When “0” is being output, if “1” is continuously input from the input circuit unit 2 as a contact input signal and it is determined that “no contact input”, the signal output to the electronic interlocking device 10 is on the safe side To control.

  An input control process in which the film breaking step S1, the contact input step S2, and the current interruption step S3 are performed at a constant processing cycle T by the control logic unit 4 of the input control device 1 will be described with reference to the time chart of FIG.

  In the film breaking step S1, the control logic unit 4 sets the control signal to “1” continuously for a predetermined time T1 and outputs it to the input circuit control unit 3. The photocoupler P2 of the input circuit control unit 3 is turned on when the control signal “1” is input. If the input contact 6 is closed at this time, the current from the input contact 6 continuously flows through the LED of the photocoupler P1 of the input circuit unit 2 to destroy the oxide film or sulfide film on the surface of the input contact 6. . At this time, “1” is continuously output from the output terminal 8 of the input circuit unit 2 to the control logic unit 4 as a contact input signal. If the input contact 6 is open at the film breaking step S1, “0” is output from the output terminal 8 of the input circuit unit 2 to the control logic unit 4 as a contact input signal. The control logic unit 4 reads the contact input signal output from the input circuit unit 2 at a timing that takes into account the circuit delay of the input circuit control unit 3 and the input circuit unit 2 after setting the control signal to “1” and outputting it. When the control signal is continuously set to “1”, if “1” is continuously input as the contact input signal, it is determined that the film destruction process of the input contact 6 is being executed.

  The control logic unit 4 executes the contact input step S2 after the film breaking step S1. In the contact input step S2, the control signal is output from “0” → “1” → “0” for a short time T2, and when the control signal is switched from “1” to “0” and the control signal is changed from “0” to “0”. When switching to "1", the contact input signal output from the input circuit unit 2 is read at a timing that takes into account the circuit delay of the input circuit control unit 3 and the input circuit unit 2. If the read contact input signal switches from “0” → “1” → “0” in the same phase as “0” → “1” → “0” of the control signal, it is determined that there is a contact input. In other cases, it is determined that “no contact input”.

  The control logic unit 4 enters the current cut-off step S3 after the contact input step S2, and outputs the control signal to “0” continuously for a predetermined time T3 to turn off the photocoupler P2 of the input circuit control unit 3 and to input contact. Even if is closed, the current flowing through the input contact 6 is continuously cut off.

  Thus, by appropriately setting the time T1 of the film breaking step S1, the time T2 of the contact input step S2, and the time T3 of the current interruption step S3 to the control logic unit 4 to break the surface film of the input contact 6, the input contact 6 can be reliably destroyed and unnecessary power consumption can be avoided, thereby saving energy.

DESCRIPTION OF SYMBOLS 1; Input control apparatus, 2; Input circuit part, 3; Input circuit control part, 4; Control logic part,
5; DC power supply, 6; input contact, 10; electronic interlocking device, P1, P2;
R1, R2, R3; resistors, IC1, IC2; inverter, D: diode.

JP 2002-366274 A JP-A-8-80851

Claims (4)

An input circuit control unit and an input circuit unit connected to an external input contact and a control logic unit;
When the input circuit control unit is inputting “1” as a control signal from the control logic unit, a contact input current from an external input contact is passed through the input circuit unit,
When the contact input current is flowing, the input circuit unit sets the contact input signal to “1” and outputs it to the control logic unit, and when the contact input current is not flowing, sets the contact input signal to “0”. Output to the control logic unit,
The control logic unit has a contact input control processing function for switching control signals in order of a contact film breaking step, a contact input step, and a current interruption step in a time-sharing manner at a constant processing cycle, and the control signal is constant in the film breaking step. Set to "1" continuously for a time and output to the input circuit control unit. In the contact input step, the control signal is switched to "0", "1", "0" for a short time and output to the input circuit control unit. In the current interrupting step, the control signal is set to “0” continuously for a predetermined time and output to the input circuit control unit, and the contact input signal output from the input circuit unit is read to perform contact input control processing. A featured contact input control device.   When the control logic unit outputs “1” as a control signal in the contact input step, the control logic unit inputs “0” as a contact input signal from the input circuit unit and “0” as a control signal. 2. The signal output to the external device is controlled to the safe side when “1” is continuously input as a contact input signal from the input circuit unit during output. Contact input control device. The input circuit control unit includes a photocoupler including an LED and a phototransistor that inputs a control signal from the control logic unit,
The input circuit unit includes an LED connected via a phototransistor of a photocoupler of the input circuit control unit between input terminals for inputting a contact input current from an external contact input unit having an input contact, and a contact input signal 3. The contact input control device according to claim 1, further comprising a photocoupler including a phototransistor connected to an output terminal for output. An input circuit control unit and an input circuit unit connected to an external input contact and a control logic unit, and when the input circuit control unit inputs "1" as a control signal from the control logic unit, A contact input current from an external input contact is passed to the input circuit unit, and when the contact input current is flowing, the input circuit unit sets a contact input signal to “1” and outputs it to the control logic unit. When the input current is not flowing, the contact input signal is set to “0” and output to the control logic unit, and the control logic unit reads the contact input signal output from the input circuit unit and performs contact input control processing. A contact input control method in a contact input control device,
Wherein the control logic unit, and the film breaking step of flowing a current to the control signal continuously a predetermined time and outputs it to the input circuit control unit in the "1" in succession to said external input contact, a control signal a short time by "0", "1", and the contact input step of flowing intermittently the current input contact of the external output to the input circuit control unit switches to "0", the control signals continuously given time " A contact input control method, wherein a current cut-off step of cutting off a current flowing through the external input contact by being output to the input circuit control unit as 0 is executed in a time-sharing manner at a constant processing cycle.

Images