JPH0476467A - Diagnosis device for ac control signal - Google Patents

Abstract

PURPOSE:To enable to make a diagnosis by connecting voltage sensors in parallel with switches controlled through control means, applying alternating current power source for inspection on them apart from driving power source for the device to be controlled, and monitoring the voltage signal of the sensors. CONSTITUTION:Sensors V1, V2 or semiconductor switching elements SSR1, SSR2 are detected to be normal, if output of the voltage sensors V1, V2 are dropped at controlling to drive a device L to be controlled with switch controllers C1, C2, meanwhile if output of the sensors V1, V2 are dropped even at controlling not to drive the device L, the elements SSR1, SSR2 or the sensors V1, V2 are detected to be abnormal. Thus, diagnosis is possible.

Description

[Detailed description of the invention] [Industrial application field]

The present invention relates to a diagnostic device for AC control signals, and particularly to one suitable for electronic interlocking devices and automatic blocking devices.

[Conventional technology]

In recent years, electronic interlocking devices mainly composed of computers have been adopted as interlocking devices. In this electronic interlocking device, display information (data) from field equipment such as track circuits is concentrated in a center and processed by a processing section.
Control information (data) based on the calculation results is given to the terminal device, and the terminal device uses the control information to transmit data to the site such as traffic lights and switch machines driven by AC power through a semiconductor switching element (SSR). The device is designed to drive and control the controlled equipment. Usually, this terminal is configured as a standby dual system, and is configured to drive a controlled device with the output of the terminal (main system) selected via a changeover switch. The state of the output of the controlled equipment is always monitored by a monitoring device equipped with a self-check mechanism (for example, the state of the output of the controlled device is constantly monitored by the applicant. 264
No. 41, etc.).

[Invention or problem to be solved]

However, the terminal fi I of the above conventional electronic interlocking device
In tFI, the output status is constantly monitored by a monitoring device equipped with a self-check function to ensure fail-safe operation, but with electronic interlocking devices where safety takes priority over everything else, there is a fail-safe or health system with higher safety. It is necessary to conduct a check study. Therefore, the present invention has been made in response to such demands, and has a first object to provide a diagnostic device for AC control signals that can perform health checks, and
A second object of the present invention is to provide a diagnostic device in which standby dual control systems can check the status of each other's control systems.

[Means to solve the problem]

AC system t! according to the present invention! In order to achieve the first purpose, the ll signal diagnostic device turns off the AC drive power of the controlled equipment.
a switch means for turning on and off; a switch control means for performing calculation processing based on predetermined input information and controlling the switch means according to the calculation result; a voltage sensor for detecting the voltage applied to the switch means; A test power supply means for applying a test AC power supply to the voltage sensor separately from the AC drive power supply, and a test power supply means for applying a test power supply to the voltage sensor; The present invention is characterized by comprising a diagnostic means for diagnosing the state of the voltage sensor or the switch means based on the output state of the voltage sensor. In addition, in order to achieve the second object, a switch means for turning on and off the AC drive power source of the controlled equipment, and a switch that performs arithmetic processing based on predetermined input information and controls the switch means based on the result of the calculation. a first control system comprising a control means, a voltage sensor that detects a voltage applied to the switch means, and a test power supply applying means that applies a test AC power source to the voltage sensor separately from the AC drive power source; , has the same configuration as the first control system, and the output side is the first control system.
A second control system connected to the control system by wire OR, and one of the first control system and the second control system serving as a main system and controlling the controlled fi device; It consists of a control system diagnostic means for diagnosing the state of the slave control system from the output state of the voltage sensor of the main control system when the system is not driving the controlled equipment. It is characterized by

[Effect]

In the above configuration, the diagnostic means detects the normality of the voltage sensor or the switch means when the output of the voltage sensor goes down when the switch control means drives and controls the controlled device, and on the other hand, the diagnostic means detects the normality of the voltage sensor or the switch means. When the output of the voltage sensor goes down despite drive control, the switch means or the voltage sensor is detected as abnormal. In addition, the control system diagnosis means detects an abnormality in the slave control system when the output of the voltage sensor of the master system goes down when the main control system is non-driving the controlled equipment. It acts to detect.

【Example】

An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a circuit diagram showing a schematic configuration of an embodiment device;
An example of electronic interlock device traffic light control is shown. The signal lamp L corresponding to the m equipment on the side indicates the progress with one rung of green or orange, and is provided between the sinusoidal AC drive power source BXCX of a predetermined voltage. In this AC power supply line, a first control system U1 and a second control system U2 having the same configuration are connected to a wired OR to form a standby dual system. Therefore, when the first control system U1 is controlling the lamp L, the first control system U1 becomes the main system, and the second control system U2 becomes the slave system. On the other hand, the second
When the control system U2 is the main system, the first control system U1 becomes the slave system. As described above, the first control system U1 and the second control system U2 have the same configuration, so the configuration of the first control system U1 will be described below. Note that components of the second control system U2 that are the same as components of the first control system U1 are given the same reference numerals with a ruby "2" added thereto. SSR is a semiconductor switching element (hereinafter referred to as SSR) corresponding to a switch means provided in the AC drive power supply lines BX and CX, and is provided in two stages in series. Therefore, a safety measure is taken so that the lamp L will not light up unless both SSR+-+ and 5SRI-2 are turned on by a controller described later. C1 is a controller mainly composed of a microcomputer (CPU), which corresponds to the switch control means of the present invention, and which receives control data from a center (not shown) (see dotted line arrow),
Display data 5IS of the voltage sensor and current sensor described below
2, and based on the calculation result, the above 5SR1
-1,5SRI-2. Voltage sensor V1 is connected in parallel with SSR. That is, a resistor r and a pair of Zener diodes d and d with opposite polarities are provided in the bypass line of the SSR, and a pair of photocouplers h and h are provided in parallel between the Zener diodes d and d. It is configured to obtain a voltage signal s1 from photocouplers h, h. This voltage sensor v1 includes AC type iBX, CX, which corresponds to the inspection power supply means that uses one of the AC power sources in common.
' or connected. Therefore, a sine wave voltage indicated by A is applied from the AC power supply BXCX' to the voltage sensor S1, and S S R1
When SSR is OFF, the voltage sensor V1 outputs a pulse-like voltage (g S1) as shown at the mouth formed by a pair of Zener diodes dd. This voltage signal S1 indicates that SSR is ON. Since the voltage sensor 1 is short-circuited, the voltage signal S1 becomes a town (0) state, and when SSR is OFF and one of the pair of photocouplers hh is not faulty, the voltage value remains unchanged. + 31 pulses are every other pulse compared to 4ET;, and furthermore, when both photocouplers h and h fail while SSR is OFF, the voltage signal S1 is down or always remains at the predetermined value (1). Therefore, reference data based on the waveforms of these voltage signals S1 is stored in advance in the controller C1, and is compared with the voltage signal S1 output from vl. The current sensor I is installed via a transformer t in the line through which the driving current flows when SSR1 is turned on and only the lamp lights up.The secondary side of this transformer is connected to the above voltage. A circuit consisting of a pair of photocouplers h and h similar to that of sensor ■1 except for the Zener diode dd is provided, and these photocouplers h and h
The current signal S2 is output from the current signal S2. Note that m in the figure is a monitor lamp that is lit when the current sensor 11 detects a current, that is, when only the lamp is lit. This current signal S2 is transmitted to the pair of photocouplers h, when SRS Rs is turned on and AC power is supplied to the lamp L.
A waveform as shown in c, in which the negative component is inverted at h, is obtained. Then, when 5SRI or ON, a pair of photocouplers h
, h is faulty, the waveform shown by C becomes every other peak, and when SSR, or is ON, both photocouplers h and h are faulty, the waveform shown by C becomes Mountains may not appear at all. Therefore, reference data based on the waveforms of these current signals S2 is stored in advance in the controller C1, and the reference data and the current signal output from the current sensor 11 are always stored in the controller C1 in the same manner as the voltage signal S1. S2 is compared and verified. Note that this current sensor 11 also includes the above-mentioned voltage sensor ■.
Similarly to 1, a Zener diode may be provided to obtain the pulsed current signal S2. In the figure, Ro is a contact point of a normal relay installed in the AC power supply lines BX and CX, and when an abnormality occurs in the first control system U1 or the second control system U2, that is, when the controller C1 or C2 When it is detected that voltage sensor v1, current sensor ■1, or lamp L is lit even though there is no command to turn on the It is configured to be turned off by a signal (signal). Next, referring to the flowchart in FIG. 2, the first control system U
1 or the main system will be explained. First, when the normal relay RO is ON and the first control system U1 is the main system (step 100 is affirmative. Hereinafter, the step will be referred to as S. 5102 is affirmative), the rung L is lit from the center (not shown) to the controller C1. Assume that the command is given (3104 affirmative), therefore, 5S
R1 (SSR, +-+ 5SRI-2) is the controller C1
It is turned ON by the output of , and the voltage sensor 1 becomes short-circuited. Therefore, the pulse-like voltage signal S1 that voltage sensor ■1 had been outputting until then becomes down (S
106 affirmative). By turning on 5SRI, lamp L becomes AC drive source BX,
CX is applied and the light is turned on, but at this time, the applied current is detected by the current sensor 11 via the transformer t, and the current signal S2 is output (S108 affirmative). By the way, when there is no lighting command for the lamp L (S104
Negative), voltage sensor V1 is connected to AC test power supply BX, C
Since X' is being applied, a predetermined voltage signal S1 is output from the voltage sensor v1 and input to the controller C1 for monitoring.At the same time, since no AC driving power is flowing to the lamp I-, the voltage signal S1 from the current sensor 11 is The current signal S2 is not output (S109 affirmative, 5110 affirmative), and in this state (S
104 negative state) Current signal S2 of current sensor 11 is O
(3109 affirmative), and voltage signal S of voltage sensor ■1
If it is 1 or 0 (Silo negative), it is determined that there is a short mode failure in the second control system U2 or a failure in the voltage sensor 1 itself. That is, when there is a short mode failure in 5SR2 of the second control system U2, both ends (BX-CX) of the first control system U1 form a short circuit, and the voltage signal S1 of the voltage sensor 1 is
However, in this case, the first control system Ul
5SRI is not in trouble, so the current signal S2 of the current sensor 11 is 0. In the meantime, the voltage sensor V1 of the first control system U1 can monitor whether or not 5SR2 of the second control system U2 has caused a short mode failure. Incidentally, in the case of the above-mentioned failure, since it is a dangerous failure, the normal relay is turned off and the lamp L is extinguished, and then abnormality processing is carried out (Sl 12, Sl 14). If the voltage signal S1 of the voltage sensor 1 does not go down and outputs the voltage signal S1 as it is even though the lamp L is commanded to light up (S106 negative), the controller C1 has failed. Since the SSR cannot be controlled by the SSR, or the SSR is in open mode failure, abnormality processing is performed such as displaying the abnormality on a display device (not shown) or printing out the abnormal state (S116.
5114). Even though there is a command to turn on the lamp L and the voltage sensor ■1 is also normal, the current signal S2 of the current sensor 11
If the specified waveform is not shown (S108 negative), the lamp L has a disconnection failure (SIIR negative, 5120), or the current sensor 11 has a failure (S118 affirmative, 51
22m In this case as well, abnormality processing is performed (S114). The above description is for the case where the first control system U1 is the main system, but the process is performed in exactly the same way when the second control system U2 is the main system (No in S102). In this case, T1 is used instead of the above-mentioned voltage signal S1, and I2 is used instead of the current signal S2. As mentioned above, the voltage sensor ■1 of the first control system U1
The state of the control system U2 is diagnosed, and conversely, when the second control system U2 is the main system, the state of the first control system U1 is diagnosed by the second control system U2 (S202 negative) . The device of this embodiment has first and second control systems U1. U2 is wired OR-combined to form a standby dual system, and controllers C, for each control system U, , U, ,
, SSR controlled by C2, 5SR2 has a voltage sensor V
1, V2 is connected in parallel, and its voltage sensor Vl,
Since the test AC power supply BX CX' is applied to V2 separately from the AC drive power supplies BX and CX of the lamp L, the voltage sensors V, , v
By monitoring the voltage signals S, , 'r, of 2,
It is possible to diagnose the status of SSR1, 3SR2 or controllers C, c2. Generally, when a sensor diagnoses an object, it detects its condition by the presence of voltage or current when it is controlled, but if the sensor itself breaks down, the object may not be under control. Such a situation is unacceptable in a device that requires safety, such as a traffic light. Therefore, in this example device, as described above, when the object (traffic light) is not controlled, voltage is not present. and detects no voltage during control. In other words, by keeping the sensor in an active state when no control is being performed, when the sensor itself fails, the sensor becomes in a controlled state, and as a result, an abnormality can be detected. In addition, since the two control systems U, U2 are wired OR1 combinations, there is no need for switch means for switching between master and slave.
Therefore, there are fewer failures, and the advantage is that the voltage sensors of each control system can be used to diagnose the control system of the other. Furthermore, each control system Us, U2 includes a current sensor 1. , I
2, it is possible to monitor the driving state of the lamp 1- and also to monitor the disconnection of the lamp I-. In addition, in the above-mentioned embodiment, although the example of the lamp for traffic lights was shown as a controlled device, it goes without saying that a switch machine or other devices may be used.

【Effect of the invention】

In the device of the present invention, a voltage sensor is connected in parallel to the switch means controlled by the switch control means, and an AC power source for testing is applied to the voltage sensor separately from the AC drive power source of the controlled equipment. By monitoring the voltage signal of the voltage sensor, the state of the switch means or switch control means can be diagnosed. In addition, since the two control systems consisting of the above-mentioned components are wired OR-connected and configured as a standby dual system, there is no need for switching means for switching between master and slave. One of its features is that it can diagnose the other party's control system using a voltage sensor.

[Brief explanation of drawings]

FIG. 1 is a circuit diagram showing a schematic configuration of an apparatus according to an embodiment of the present invention, and FIG. 2 is a flow chart showing the operating state. Vl, V2... Voltage sensor, 11, I2... Current sensor, 5SR1, 5SR2... Semiconductor switching element (switch means), Cs, C2"... Controller (switch control means),
L... Lamp (side aIl#! device), X X CX... AC drive power supply, Cx'... power supply means for inspection.

Claims (2)

[Claims] (1) A switch means for turning on and off an AC drive power source of a controlled device; a switch control means for performing arithmetic processing based on predetermined input information and controlling the switch means according to the result of the calculation; and a voltage applied to the switch means. a voltage sensor for detecting a voltage applied to the controlled device; a test power supply applying means for applying test AC power to the voltage sensor separately from the AC drive power supply; and a switch control means for controlling a controlled device via the switch means. A diagnosing device for diagnosing an AC control signal, comprising: diagnosing means for diagnosing the state of the voltage sensor or the switch means based on the output state of the voltage sensor when drive control is performed and when non-drive control is performed. (2) a switch means for turning on and off the AC drive power source of the controlled equipment; and a calculation process based on predetermined input information;
switch control means for controlling the switch means based on the calculation results; a voltage sensor for detecting the voltage applied to the switch means; a first control system comprising a power supply means; a second control system having the same configuration as the first control system and whose output side is wired-OR coupled with the first control system; When one of the two control systems is the main system and controls the controlled equipment, and when the main system is not driving the controlled equipment, the control system that is the main system; A diagnostic device for an AC control signal, comprising: control system diagnostic means for diagnosing the state of a slave control system based on the output state of a voltage sensor.