JPH0630801U - Input / output device of programmable controller - Google Patents

Abstract

(57) [Summary] [Purpose] Even if the external power supply fails, the failure can be easily checked. [Structure] A second connector for connecting an external power supply is provided on the input / output device side, and by connecting an external power supply to the second connector, power is supplied from the input / output device side to the control target device side and the second connector is connected. The input / output device is driven by the connected external power supply.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a programmable controller input / output device for exchanging on / off information signals between an electronic device and a programmable controller.

[0002]

[Prior art]

 FIGS. 3 and 4 show the configuration of signal lines for connecting the input / output device of the conventional programmable controller and the device to be controlled. In FIG. 3, an information signal indicating the on / off operating state of the contacts 4a and 4b on the controlled device 4 side is input via the cable 3 to the input device 1A of the programmable controller via the connector 2. In FIG. 4, the output signal from the output device 1B of the programmable controller is given to the external devices 4c and 4d via the connector 2 and the cable 3.

In order to transmit the information signal, an external power source 5 is provided on the controlled device 4 side, and the external power source 5 is connected in parallel to the contacts 4a, 4b and the external devices 4c, 4d via power source lines 3b, 3c. is doing. The external power source 5 is also used as a driving power source for the input device 1A and the output device 1B.

[0004]

[Problems to be solved by the device]

 However, in the above-described conventional device, when the external power source 5 fails due to the external power source 5 being installed on the controlled device 4 side, it takes time to repair the external power source and the external power source fails. However, there was a problem that it could not be inspected whether it was a malfunction of the equipment to be controlled or not unless it went to the place where the equipment to be controlled was installed. Further, the output device shown in FIG. 4 has a drawback that two power lines are required.

Therefore, an object of the present invention is to eliminate the above-mentioned drawbacks of the conventional device and provide an input / output device of a programmable controller capable of easily inspecting a failure state of an external power supply.

[0006]

[Means for Solving the Problems]

 In order to achieve the above-mentioned object, the present invention provides a first connector for connecting to a controlled device for transmitting an information signal and a second connector for connecting an external power source provided on the input / output device side. Is formed, and the control target device and the input / output device are driven by an external power source connected to the second connector of the input / output device.

[0007]

[Action]

 An information signal is transmitted by an external power supply provided on the input / output device side, and the input / output device is driven, so that when the external power supply fails, the input / output device side can easily check. Moreover, when the input / output device is an output device, the number of power supply lines can be reduced.

[0008]

【Example】

 Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. 1 and 2 show the connection configuration of the input / output device in the embodiment of the present invention.

As shown in FIG. 1, a connector 8 (a second connector of the present invention) for connecting an external power supply 7 provided on the input device 1A side is formed in the input device 1A. The connector 8 is provided on the terminal block 6, and in the input device 1A, the connector 8 is arranged in parallel with the information transmission signal line 3a together with the conventional connector 2 of the signal line 3b for external power supply connection (the connector of the stand 1 of the present invention). It is connected. In this way, since a predetermined voltage is applied to the information transmission signal line 3a by connecting the external power source 7 on the input device 1A side, the on / off information signals of the contacts 4a, 4b are transmitted to the input device 1A. Transferred to photo coupler.

In FIG. 2, the output device 1B is provided with a connector 8 for connecting the external power supply 7 to the output device 1B. In the case of FIG. 2, power is supplied from the external power source 7 to the external devices 4c and 4d on the controlled device 4 side through the power supply line 3b, and the output transistors of the output device 1B are turned on to turn on the external devices 4c and 4d. The output signal is transmitted to. In the output device 1B, the constant voltage circuit 9 is connected to the external power source 7, and the driving power source of the output device 1B is obtained from the constant voltage circuit 9. Further, in FIG. 2, only one power supply line 3b is required, which can reduce the labor for laying the signal line as compared with the conventional device of FIG.

In addition to this embodiment, the following examples can be given. That is, when the main external power supply is connected to the controlled equipment side as shown by the dotted line and the secondary external power supply is connected to the input / output device side for backup to this main external power supply, the voltage detection of the main external power supply is performed. It is possible to reduce the power consumption of the system by determining whether or not there is a failure and connecting the secondary external power supply to the power supply line according to the failure detection.

[Effect of device]

 As described above, according to the present invention, even if the external power source fails, the failure can be easily checked on the input / output device side, and it is necessary to change the conventional device configuration on the controlled device side. In addition, the number of power lines can be reduced, and the labor for laying signal lines can be reduced.

[Brief description of drawings]

FIG. 1 is a circuit diagram showing a connection configuration of an input device according to an embodiment of the present invention.

FIG. 2 is a circuit diagram showing a connection configuration of an output device according to an embodiment of the present invention.

FIG. 3 is a circuit diagram showing a connection configuration of an input device of a conventional device.

FIG. 4 is a circuit diagram showing a connection configuration of an output device of a conventional device.

[Explanation of symbols]

 1A Input device 1B Output device 2 Connector 4 Controlled device 7 External power supply

Claims (2)

[Scope of utility model registration request] 1. A first connector for connecting to a controlled device for transmitting an information signal and a second connector for connecting an external power source provided on the side of an input / output device are formed, and the input connector is formed. An input / output device of a programmable controller, characterized in that an external power supply connected to a second connector of the output device drives the controlled device and the input / output device. 2. The programmable controller input / output device according to claim 1, wherein the input / output device is an output device.