The grounding policy is nothing more than to avoid disturbance for safety, and the policy of grounding to PLC must not be attached to the disturbance at the power supply and input and output terminals, so the accurate grounding system is one of the primary methods for the PLC control system to resist electromagnetic disturbance. The grounding preparation has floating preparation and direct grounding preparation, and the direct grounding preparation should be selected for the PLC control system.
The grounding policy is nothing more than to avoid disturbance for safety, and the policy of grounding to PLC must not be attached to the disturbance at the power supply and input and output terminals, so the accurate grounding system is one of the primary methods for the PLC control system to resist electromagnetic disturbance. The grounding preparation has floating preparation and direct grounding preparation, and the direct grounding preparation should be selected for the PLC control system.
The detailed grounding formula is selected as follows: grounding of the barrier line barrier layer: when the signal source is grounded, the barrier layer should be grounded on the signal side; When the signal source is not grounded, it should be grounded on the PLC side; When there are joints at both ends of the signal line, the barrier layer should be stably adjacent and insulated, and multi-point grounding must be avoided; When the barrier twisted pair of multiple measurement point signals is adjacent to the multi-core twisted pair main screen cable, each barrier layer should be adjacent to each other, and after insulation treatment, the appropriate grounding point should be selected for single-point grounding.
Wiring of input and output parts: PLC power cable, I/O power line, input signal line, output signal line, exchange line, and DC line should be separated as much as possible. The switching signal line and the analog signal line should also be separated from the wiring, and the latter should be a barrier line, and the barrier layer should be grounded. Barrier lines should also be used for digital transmission lines, and the barrier layer should be grounded. Because the purpose of the current mark in the twisted pair is opposite, the size is the same, and the noise caused by the current can cancel each other, so the signal line is mostly twisted pair or barrier line.
1. Grounding disposal of PLC
In the PLC control system. There are many forms of "ground".
Not required:
(1) Signal ground: It is the ground of the signal element sensor at the input end. In order to attach disturbance to the power supply, transmission, and output, the PLC system should be grounded excellently. General environment. The grounding arrangement is related to the signal frequency, when the frequency is lower than 1MHz, a point of grounding can be used; When higher than 10MHz, multi-point grounding is selected;
Which ground to choose between 110MHz depends on the actual environment.
Therefore, the control system composed of PLC is often grounded at one point. The cross-sectional area of the grounding wire is not less than 2mm2. The grounding resistance should not be greater than 100Q, and the grounding wire should be shared. If this requirement is not met. A common grounding arrangement is also available. Choose a preparation that is grounded with other equipment.
(2) Barrier: The shell or wire mesh that is generally set up to avoid static electricity. It is adjacent to the earth's crust by a specially made copper wire.
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