JP2561278Y2 - Output circuit device with check circuit - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an output circuit device having an inspection circuit.
The present invention relates to a new improvement to be performed by a single inspection circuit.

[0002]

2. Description of the Related Art There are various types of output circuit devices having a check circuit of this kind which have been used in the past. Among them, a circuit shown in FIG. . That is, what is indicated by reference numeral 1 in FIG. 2 is an inspection circuit.
The detection signal 3a from the switching circuit 3 is input to the determination circuit 2 provided in the. The switching circuit 3 includes a light emitting element 5 to which an output signal 4 a from an output circuit 4 is input, and a phototransistor 6 for receiving light from the light emitting element 5. Output signal constitutes the inspection signal 3a. The output circuit 4 is configured such that the output 4a of the output circuit 4 is controlled by inputting an output control signal 4b for controlling the output,
The detection signals 3a of the other inspection circuits 1A and 1B connected to the other output circuits 4A and 4B independent of the output circuit 4 are input to the determination circuit 2. Therefore, each detection signal 3a from each inspection circuit 1, 1A, 1B is input to the determination circuit 2, and the output state of each output circuit 4, 4A, 4B can be inspected.

[0003]

The output circuit device having the conventional inspection circuit is configured as described above.
The following issues existed. That is, in order to inspect each output circuit, an inspection circuit must be provided for each output circuit, and the circuit configuration has been complicated.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-described problems. In particular, an output circuit device having an inspection circuit in which the operation inspection of a plurality of output circuits is performed by one inspection circuit is provided. The purpose is to provide.

[0005]

An output circuit device having a check circuit according to the present invention is an output circuit device having a check circuit in which output signals from a plurality of output circuits are checked by a check circuit having a switching circuit. A constant voltage diode having one end connected to each of the output signals, a switching section of a relay circuit connected to the other end of each of the constant voltage diodes, and a third circuit provided in the relay circuit and connected to the output signal. The inspection circuit includes one connection point and a second connection point provided in the relay circuit and connected to the switching circuit, and the inspection circuit includes one.

[0006]

In the output circuit device having the inspection circuit according to the present invention, part of the output signal from each output circuit is input to a common relay circuit via a constant voltage diode, and the output of this relay circuit is one. Is determined through the inspection circuit described above, the inspection circuit can be shared by one, and the circuit configuration can be greatly simplified.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of an output circuit device having an inspection circuit according to the present invention will be described in detail with reference to the drawings. Note that the same or equivalent parts as those in the conventional example are denoted by the same reference numerals and described. FIG. 1 is a block diagram showing an output circuit device having an inspection circuit according to the present invention.

In FIG. 1, reference numeral 1 denotes an inspection circuit, and a detection circuit 3 provided in the inspection circuit 1 receives a detection signal 3a from a switching circuit 3.

The switching circuit 3 receives a light from the light emitting element 5 to which an output signal 4a from the output circuit 4 is input via a constant voltage diode 10 and a relay circuit 11 connected in series to each other. The output signal from the phototransistor 6 constitutes the detection signal 3a. Note that one end 10a of the constant voltage diode 10
Is connected to an output signal 4a described later, and the other end 10b is connected to a switching contact 12a described later.

The relay circuit 11 comprises a switching contact 12a having a switching section 12, and a first connection point 13 and a second connection point 14 to which the switching section 12 is selectively connected. The connection point 13 is connected to the same voltage (for example, 28 V) as the voltage from the output 4 a, and the second connection point 14 is connected to the light emitting element 5.

A relay control signal 15 is input to the relay circuit 11, and the switching unit 12 uses the relay control signal 15 to switch the first connection point 13 or the second connection point 1.
4 can be selectively switched.

An output control signal 4b for controlling the output is input to the output circuit 4, so that the output 4a of the output circuit 4 is controlled. The respective outputs 4a from the other output circuits 4A and 4B are also connected to the relay circuit 11 via the constant voltage diode 10.

Therefore, when the switching section 12 of the relay circuit 11 is switched to the state of being connected to the second connection point 14, the output signal 4a from each of the output circuits 4, 4A, 4B passes through the constant voltage diode 10. Input to the switching circuit 3,
If the voltage is up to 8 V, the switching circuit 3 is turned on, and the determination circuit 2 determines that the voltage levels of the output circuits 4, 4A and 4B are safe.

Further, when the output signal 4a becomes 28 V or more, each constant voltage diode 10 cuts off the signal, so that the switching circuit 3 is turned off, and the judgment circuit 2 is turned off.
Determines that the output signal 4a from the output circuit 4 is 28 V or more.

When the inspection circuit 1 is not used, the switching unit 12 is switched to the second connection point 14 so that each diode 10 becomes a closed loop, and external noise enters from the output signal 4a side. In this case, the output signal 4a can be protected by the absorption in the closed loop circuit.

[0016]

The output circuit device having the inspection circuit according to the present invention is configured as described above, so that the following effects can be obtained. That is, a part of the output signal from each output circuit is input to a common relay circuit via a constant voltage diode, and the output of this relay circuit is determined through one inspection circuit. A single circuit can be used in common, and the circuit configuration can be greatly simplified. In addition, since a constant voltage diode is used, when a check circuit is not used, external noise input can be absorbed by the constant voltage diode, and protection of an output signal can be obtained.

[Brief description of the drawings]

FIG. 1 is a circuit diagram showing an output circuit device having an inspection circuit according to the present invention.

FIG. 2 is a circuit diagram showing an output circuit device having a conventional inspection circuit.

[Description of Signs] 1 Inspection circuit 3 Switching circuit 4, 4A, 4B Output circuit 4a Output signal 10 Constant voltage diode 11 Relay circuit 12 Switching unit 13 First connection point 14 Second connection point

Claims (1)

(57) [Scope of request for utility model registration] An output circuit device having an inspection circuit configured to inspect output signals (4a) from a plurality of output circuits (4, 4A, 4B) by an inspection circuit (1) having a switching circuit (3). A constant voltage diode (10) having one end connected to each of the output signals (4a); and each of the constant voltage diodes (10)
A switching unit (12) of a relay circuit (11) to which the other end is connected; a first connection point (13) provided in the relay circuit (11) and connected to the output signal (4a); A second connection point (14) provided in the circuit (11) and connected to the switching circuit (3);
An output circuit device having an inspection circuit, wherein the inspection circuit (11) is constituted by one.