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input circuit

A technology of input circuit and circuit, applied in the direction of logic circuit interface device, logic circuit connection/interface layout, electrical program control, etc., can solve the problems of expansion consumption and high cost, and achieve the effect of power consumption limit protection

Active Publication Date: 2021-04-02
SCHNEIDER ELECTRIC IND SAS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Such extensions are usually expensive
[0004] Moreover, the very high-cost input and output solutions used in high-end distributed control system products are not suitable for PLC / PAC products

Method used

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Embodiment Construction

[0019] The principles of the disclosure will be described below with reference to several example embodiments illustrated in the accompanying drawings. It should be understood that these embodiments are described only to enable those skilled in the art to better understand and implement the present disclosure, rather than to limit the scope of the present disclosure in any way.

[0020] figure 1 A schematic diagram of an input circuit 1 according to an embodiment of the present disclosure is shown.

[0021] Such as figure 1 As shown, the input circuit 1 comprises an input terminal comprising a first input terminal 11 and a second input terminal 12 and configured to receive an input signal. In this embodiment, the input signals specifically include 24V DC digital input signals, 0-20mA analog input signals, and ±10V analog input signals. However, it will be appreciated by those skilled in the art that other desired ranges of input signals are also possible.

[0022] The inpu...

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Abstract

The embodiment of the invention relates to an input circuit. The input circuit comprises an input end, a resistor, an N-type field effect transistor and an operational amplifier, wherein the input end comprises a first input terminal and a second input terminal, and is configured to receive an input signal; the N-type field effect transistor and the resistor are coupled in series between the first input terminal and the second input terminal; the operational amplifier is coupled to the resistor and a grid electrode of the N-type field effect transistor, and configured to receive a control signal corresponding to the input signal; and the operational amplifier is configured to keep the N-type field effect transistor in a switch-on state and limiting current flowing through the resistor, or keep the N-type field effect transistor in a switch-off state to output the input signal according to the received control signal.

Description

technical field [0001] Embodiments of the present disclosure relate to programmable logic controllers and programmable automation controllers, and more particularly, to an input circuit for a programmable logic controller or programmable automation controller. Background technique [0002] Currently, solutions for general-purpose input and output ports only exist in high-end distributed control systems (DCS, Distributed Control System), which often have very expensive costs. [0003] For a Programmable Logic Controller (PLC) or Programmable Automation Controller (PAC), for example, there are 10 nodes for inputs on the PLC / PAC, where for example 6 of the input nodes are determined for digital inputs, and The other 4 input nodes are used for analog input, that is to say, the arrangement of these 10 input nodes is fixed. At this time, if 5 nodes for digital input and 5 nodes for analog input are required on the PLC / PAC, it is necessary to expand the use of the original input / o...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H03K19/0175G05B19/05
CPCG05B19/054H03K19/017509
Inventor 潘今宇
Owner SCHNEIDER ELECTRIC IND SAS