PLC (Programmable Logic controller)-based digital signal collection board card with isolation function

Abstract

The invention discloses a PLC (Programmable Logic controller)-based digital signal collection board card with an isolation function. The board card comprises an isolation protection circuit, a PLC end input interface J1, an external negative signal end input interface J2 and an external positive signal end input interface J3, wherein the isolation protection circuit is correspondingly connected with the PLC end input interface J1 and the external negative signal end input interface J2. By manufacturing the digital signal collection board card, the electric isolation between a digital signal and a PLC module is realized, thus protecting the PLC module; by utilizing an IN4007, the alternating current protection of field sensor signal collection is realized; and by manufacturing a PCB (Printed Circuit Board), an installation space is reduced, the complex wiring work for an intermediate link in the conventional process is also saved, and the communication can be realized only needing to finish the wiring between the PCB and a realistic grade as well as between the PCB and a PLC end, thus greatly improving the working efficiency.

Description

technical field [0001] The invention belongs to the technical field of switching input processing in automatic control, and relates to a digital signal acquisition board based on PLC with isolation. Background technique [0002] Modern technology is changing with each passing day. The control of equipment is in pursuit of automation and intelligence. It is necessary to collect a large number of on-site signals for the controlled equipment. Commonly used are various pressure switch signals, travel switch signals, proximity switch signals and other digital quantities. . Especially in the industrial field, PLC with modularization and strong flexibility is widely used, and it needs to collect a large number of digital signals on site, and it is equipped with multiple multi-channel digital signal acquisition modules. [0003] At present, the widely used method is to use a large number of terminal blocks, wire slots, and guide rails to realize wiring installation. The hardware co...

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Problems solved by technology

[0004] The purpose of the present invention is to provide a digital signal acquisition board based on PLC with isolation, which solves the problems in the prior art due to the many signal acquisition channels, complicated wiring, low installation, debugging and maintenance efficiency, large space occupation, unsightly appearance, and inconvenient inspection and maintenance. The problem

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