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Programmable logic controller (PLC) digital input control device and control method

A technology of digital input and control device, applied in sequence/logic controller program control, electrical program control, etc., can solve the problem of low reliability of digital input points, and achieve reliability problems and high-efficiency systems. The effect of maintenance and loss reduction

Active Publication Date: 2012-05-23
深圳市合信自动化技术有限公司
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  • Abstract
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Problems solved by technology

[0004] In order to solve the technical problem of low reliability of digital input points in the prior art, an embodiment of the present invention proposes a PLC digital input control device, which includes a programmable logic controller PLC digital input processing module and at least one digital Quantity input control circuit, the PLC digital quantity input processing module is connected with the digital quantity input control circuit, wherein

Method used

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  • Programmable logic controller (PLC) digital input control device and control method
  • Programmable logic controller (PLC) digital input control device and control method
  • Programmable logic controller (PLC) digital input control device and control method

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no. 1 example

[0085] Such as Figure 8 The flow chart of the first embodiment of the PLC digital input control method of the present invention shown includes:

[0086] Step S801: the first digital quantity input circuit and the second digital quantity input circuit receive the digital quantity input from the same programmable logic controller PLC digital quantity input port, and control and output the digital quantity;

[0087] Specifically, the PLC digital quantity input control device includes at least one digital quantity input control circuit, the digital quantity input control circuit includes a first digital quantity input circuit and a second digital quantity input circuit, the first digital quantity input circuit and the second digital quantity input circuit The input circuit receives the digital quantity input from the same input port, and controls and outputs the digital quantity. It should be noted that one digital input control circuit corresponds to one digital input port; the...

no. 2 example

[0089] Further, as Figure 9 The flow chart of the second embodiment of the PLC digital input control method of the present invention shown includes:

[0090] Step S901: the first digital quantity input circuit and the second digital quantity input circuit receive the digital quantity input from the same programmable logic controller PLC digital quantity input port, and control and output the said digital quantity;

[0091] Step S902: the first edge detection unit receives the digital signal controlled and output by the first digital input circuit, and detects the output voltage state information of the first digital input circuit; the second edge detection unit receives the second The digital input circuit controls the output digital signal, and detects the output voltage state information of the second digital input circuit;

[0092] Specifically, the input fault detection module of the PLC digital input control device may include a first edge detection unit and a second ed...

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Abstract

The embodiment of the invention discloses a programmable logic controller (PLC) digital input control device, which comprises a PLC digital input processing module and at least one path of digital input control circuit. The PLC digital input processing module is connected with the digital input control circuit. The digital input control circuit comprises a first digital input circuit and a second digital input circuit, wherein the first and second digital input circuits receive a digital quantity from the same input port, and control and output the digital quantity. The PLC digital input processing module comprises at least one input failure detection module, wherein the input failure detection module is used for receiving a digital signal which is controlled and output by the first and second digital input circuits, detecting whether the digital input control circuit fails or not and setting failure state alarming information if a detection result indicates that the digital input control circuit fails. Correspondingly, the embodiment of the invention also discloses a PLC control system and a PLC digital input control method.

Description

technical field [0001] The invention relates to the field of electronic communication, in particular to a PLC digital quantity input control device and a control method thereof. Background technique [0002] Programmable Logic Controller (PLC, Programmable Logic Controller) is an electronic device specially designed for digital operations in industrial environments. PLC has been widely used in the field of industrial automation. The amount of digital quantity (switching quantity) controlled by PLC exceeds one thousand points in a medium-scale system, and the number of input points and output points is quite large. The reliability of its input points and output points is related to the reliability of the entire automation application system. reliability. [0003] In the prior art, the most common form of digital input point is to use optocoupler for isolation (that is, photoelectric isolation), such as figure 1 As shown, a digital input port is sequentially connected to a c...

Claims

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Application Information

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IPC IPC(8): G05B19/05
Inventor 陈海峰戎思吉
Owner 深圳市合信自动化技术有限公司
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