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Method and circuit for digital input disconnection detection

A digital input and detection circuit technology, applied in the direction of measuring electricity, measuring electrical variables, measuring devices, etc., can solve the problem of high cost and achieve the effect of low hardware cost

Active Publication Date: 2017-05-17
SCHNEIDER ELECTRIC IND SAS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] However, if the line between the sensor / switch and the input terminal of the PLC is disconnected, it cannot be detected through this input channel
Therefore, in the technical solution for detecting disconnection of the AC digital input in the prior art, it is necessary to add an input channel for the feedback of disconnection detection, so that the cost is relatively high

Method used

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  • Method and circuit for digital input disconnection detection
  • Method and circuit for digital input disconnection detection
  • Method and circuit for digital input disconnection detection

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Embodiment Construction

[0026] The present invention will be fully described below with reference to the accompanying drawings showing embodiments of the invention. However, this invention may be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art. In the drawings, components are exaggerated for clarity.

[0027] It will be understood that when an "element" is referred to as being "connected" or "coupled" to another element, it can be directly connected or coupled to the other element or intervening elements may be present. In contrast, when an element is referred to as being "directly connected to" or "directly coupled to" another element, there are no intervening elements present. The same reference numerals designate the same elements. As used herein, the term "and / or" i...

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Abstract

This application discloses a digital input disconnection detection circuit, which includes: a digital input circuit, including: a sensor / switch; an auxiliary impedance device connected in parallel with the sensor / switch; and a power supply connected in series with the sensor / switch; the digital input circuit is used for Output the digital signal output by the sensor / switch of the user equipment to the conversion circuit; the conversion circuit is used to receive the digital signal from the digital input circuit and convert the digital signal into a predetermined digital signal that can reflect various states of the sensor / switch; an isolation circuit for converting a predetermined digital signal into a predetermined digital signal with a first level; and a detection circuit for detecting the predetermined digital signal with a first level output by the isolation circuit and outputting a state representing the sensor / switch status signal. The method of the present application solves the high cost problem of the prior art technical solution, and can save more PCB space in the current technical solution.

Description

technical field [0001] The present invention relates to a method for disconnection detection, more specifically, relates to a method and a circuit for detecting disconnection of digital input of PLC (Programmable Logic Controller,) by using a duty cycle conversion circuit. Background technique [0002] When the PLC controls various user equipment, various operation buttons and switch values ​​such as pressure, temperature, liquid level, and travel switches in the equipment are directly connected to the input terminal of the PLC. The internal circuit of the PLC can scan the presence or absence of the switch signal. That is, when the sensor / switch is on, there is a signal input; and when the sensor / switch is off, there is no signal input. [0003] However, if the line between the sensor / switch and the input terminal of the PLC is disconnected, it cannot be detected through the input channel. Therefore, in the technical solution for detecting disconnection of the AC digital i...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G05B19/048G01R31/02
CPCG01R31/67
Inventor 谢鉴
Owner SCHNEIDER ELECTRIC IND SAS