JPH04304113A - No-voltage contact device - Google Patents

Abstract

PURPOSE:To inhibit the output of erroneous contact information when a contact output device becomes abnormal by connecting a relay circuit to a feedback circuit which is connected to an information transmission circuit and a power source on a contact output side in a no-voltage contact device provided with the feedback circuit. CONSTITUTION:When the contacts (1-1)-(10n) of relay circuits on a contact output side are closed, an electric current starts to flow and contact reception circuits (2-1)-(2-n) respectively detect the closed states of the contacts (1-1)-(1-n). In case the contact 4 of a relay circuit 5 connected to a feedback circuit on a contact output side is opened, no electric current flows from the circuit 3 even when the contacts (1-1)-(1-n) are closed and the transmission of contact information is discontinued. An abnormality detection circuit 6, on the other hand, monitors device abnormality about the output voltage of the power source of a device on the contact output side and controls the relay circuit 5 to open the contact 4 upon detecting device abnormality. Therefore, a control output which gives an adverse influence to a safety measure can be blocked.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of Industrial Application The present invention is applied to a contact interface device. In particular, it relates to a remote control device for a dam sluice in a water management system.

0002

[Prior Art] In the conventional example, a relay circuit is provided on the contact output side, and the contacts of this relay circuit are opened or closed during signal transmission, and voltage is applied to the contact circuit on the contact input side to determine whether current flows or not. They tried to give it meaning and send contact information.

0003

[Problem to be Solved by the Invention] In such a conventional example, contact information is output as is by driving from a transmitting circuit, and if the device on the contact output side falls into an abnormal operating state, incorrect contact information may be generated. It had the disadvantage of outputting .

[0004] In particular, if the opening degree of a dam water gate is incorrectly adjusted when remotely controlling it, there is a risk that abnormal water will be discharged downstream, resulting in a serious accident that may even affect human life.

SUMMARY OF THE INVENTION The present invention aims to eliminate these drawbacks and provides a voltageless contact device having means for permitting and prohibiting the use of a power source.

[0006]

[Means for Solving the Problems] The present invention provides a system in which the contacts of a relay circuit and a receiving circuit that senses the current that is interrupted in response to the opening and closing of the contacts and detects the open and closed states of the contacts are inserted and connected in parallel. In a voltageless contact device comprising a plurality of information transmission circuits and a feedback circuit connected to the information transmission circuit and inserted with a power source, a new relay circuit is provided in which the contact is inserted into the feedback circuit. Features.

[0007] Here, it is desirable to provide an abnormality detection circuit that detects an abnormal state of the device itself and drives the contacts of the new relay circuit to an open state.

[0008]

[Operation] When incorrect information may be transmitted due to equipment abnormality,
Disconnect the power supply from the information transmission circuit to prohibit information transmission. This allows safety measures to be taken.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a block diagram of this embodiment. In this embodiment, as shown in FIG. 1, the relay circuit contacts 1-1 to 1-
a contact receiving circuit 2 that senses the current that is interrupted according to the opening and closing of the contacts 1-1 to 1-n and detects the open and closed states of the contacts.
-1 to 2-n are inserted, and a plurality of information transmission circuits are connected in parallel, and a feedback circuit connected to the information transmission circuit and having a power supply circuit 3 inserted therein, is a feature of the present invention. The means include a relay circuit 5 whose contacts 4 are inserted into the feedback circuit, and an abnormality detection circuit 6 which detects an abnormal state of its own device and drives the contacts 4 of the relay circuit 5 to an open state.
Equipped with.

Next, the operation of this embodiment will be explained. When the contacts 1-1 to 1-n of the relay circuit on the contact output side close, current flows from the power supply circuit 3 to each contact receiving circuit 2-1 to 1-n.
2-n is connected to contacts 1-1 to 1- of the relay circuit by this current.
Detects the closed state of n. Also, contact 1-1 of the relay circuit
~1-n opens, current no longer flows from the power supply circuit 3,
Each of the contact receiving circuits 2-1 to 2-n transmits and receives contact information by detecting the open state of the contacts 1-1 to 1-n of the relay circuit. Here, if the contact 4 of the relay circuit 4 inserted into the feedback circuit on the contact output side is opened, the current from the power supply circuit 3 will not flow even if the contacts 1-1 to 1-n of the relay circuit are closed, and the contact information Transmission will be blocked. On the other hand, the abnormality detection circuit 6 monitors the power supply output voltage of the contact output side device for abnormalities in the device, and controls the relay circuit 5 to open the contact 4 when detecting an abnormality in the device.

[0011]

[Effects of the Invention] As explained above, the present invention enables permission/prohibition control of contact information transmission by inserting a relay circuit into the feedback circuit on the contact output side, so that when the contact output device becomes abnormal, It is possible to prohibit the output of erroneous contact information, and particularly when control related to human life is performed using contact information, there is an effect that erroneous control output can be cut off for safety reasons.

[Brief explanation of the drawing]

FIG. 1 is a block configuration diagram showing the configuration of an embodiment of the present invention.

[Explanation of symbols]

1-1 to 1-n Contact 2-1 to 2-n Contact receiving circuit 3 Power supply circuit 4 Contact 5 Relay circuit 6 Abnormality detection circuit

Claims (2)

[Claims] [Claim 1] A plurality of information transmission circuits connected in parallel and a receiving circuit that detects the open/closed state of the contacts by sensing the current that is interrupted in response to the opening/closing of the relay circuit and the contact of the relay circuit are inserted. A non-voltage contact device comprising a feedback circuit connected to an information transmission circuit and inserted with a power source, the non-voltage contact device comprising a new relay circuit in which the contact is inserted into the feedback circuit. 2. The voltageless contact device according to claim 1, further comprising an abnormality detection circuit that detects an abnormal state of the device itself and drives a contact of the new relay circuit to an open state.