Digital signal driving interface card with isolation function and bypass based on programmable logic controller (PLC)
A digital signal and interface card technology, which is applied to the program control and electrical program control of the sequence/logic controller, can solve the problems of low installation, commissioning and maintenance efficiency, inconvenient inspection and maintenance, and many signal channels, so as to improve installation and commissioning Work efficiency, flexible use, and the effect of reducing installation space
Active Publication Date: 2012-11-07
BAOJI PETROLEUM MASCH CO LTD +2
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Problems solved by technology
[0004] The purpose of the present invention is to provide a digital signal drive interface card based on PLC with isolation and bypass, which solves the problem of complex wiring, unsightly appearance, inconvenient inspection and maintenance, and low efficiency of installation, debugging and maintenance in the prior art due to many signal channels. question
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[0024] The present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments.
[0025] refer to figure 1 , the present invention is a digital signal drive interface card based on PLC band isolation and bypass, its module structure is shown in the dotted line box, including PLC end input interface J1, PLC end isolation protection circuit 2, bypass end isolation protection circuit 5 , external signal output interface J2 and J3, external signal input interface J4, connected to each other to form a PCB board,
[0026] The input terminal of the isolation protection circuit 2 at the PLC end is connected to the PLC digital output module 1 through the input interface J1 at the PLC end, and the isolation protection circuit 2 at the PLC end is connected to the controlled device 3 at the field level through the external signal output interfaces J2 and J3 at the same time; In addition, the external signal input interface J4 is conn...
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The invention discloses a digital signal driving interface card with an isolation function and a bypass based on a programmable logic controller (PLC). The digital signal driving interface card comprises a PLC end input interface J1, a PLC end isolation protection circuit, a bypass end isolation protection circuit, external signal output interfaces J2 and J3 and an external signal input interface J4. The interface card has two working modes, namely a PLC normal working mode and a bypass emergency control mode; by a relay, a digital signal is electrically isolated from a PLC module; furthermore, when one mode works, the other working mode can be isolated; due to IN4007, the module can be effectively prevented from being burned by reverse current or power short circuit is avoided; due to a printed circuit board (PCB), complicated wiring work of steps in the conventional process is eliminated; only if the PCB is connected to a reality level and the PLC module, communication is realized; and therefore, the working efficiency is greatly improved.
Description
technical field [0001] The invention belongs to the technical field of switching output control in automatic control, and relates to a PLC-based digital signal drive interface card with isolation and bypass. Background technique [0002] Modern technology is changing with each passing day, and the control of equipment pursues automation and intelligence. This requires outputting a large number of on-site drive signals to the controlled equipment to realize digital control equipment such as various solenoid valves, DC contactors, and signal lights. control. Especially in the industrial field, modular and flexible PLCs are widely used, which need to drive and control a large number of digital signals on site, and are equipped with multiple multi-channel digital signal drive 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 cost is high, and the installation...
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IPC IPC(8): G05B19/05
Inventor 张鹏飞丛万生林康梁卫斌李庆福
Owner BAOJI PETROLEUM MASCH CO LTD