The purpose of PLC of the grounding and method Industrial control -

Grounding is nothing but for the sake of safety and prevent interference, the purpose of the purpose of the grounding for PLC mainly inhibit additional interference on the power supply and input, output end, so the correct grounding system is PLC controller control system is one of the important measures of resistance to electromagnetic interference. Mode and direct grounding method of grounding method are floating, for direct grounding method should be adopted PLC control system.

specific grounding methods are as follows: shielding wire shield grounding, signal grounding, shield should be against the side of the signal grounding; Signal source is not grounded, should be in PLC side grounding; Signal lines in the middle joint, shielding layer should be firmly connected and insulating treatment, multipoint earthing must be avoided; Multiple signal measuring point is shielded twisted-pair cable and multi-fiber twisted-pair cable connection, the total screen each shield should be connected well, and the insulation treatment, select the appropriate answer is located in the single point grounding.

input output part of wiring: PLC, power cord, I/O power supply cord, input signal and output signal lines, communication lines, dc lines should be separated as far as possible wiring. Switch signal and analog signal lines should be separated and wiring, and the latter should use shielded wire, grounding and shielding layer. Digital transmission line with shielded wire and will shield grounding. Due to the current in the opposite direction, twisted pair are equal in size, but will cause the noise of the induced current offset each other, so the signal lines with twisted pair or shielded wire. Have a variety of forms and other; Throughout the &; 。 Main:

1) Letters: signal is input signal components & ndash; — The sensor. In order to restrain additional power supply and input, the output interference, should make a good grounding for the PLC system. Grounding method is associated with signal frequency, when frequency is lower than 1 MHz, available point grounding; More than 10 MHz, adopting the multipoint grounding;

in 1 & ndash; What the ground between 10 MHZ depending on the actual situation. Ground wire cross-sectional area was not less than 2. Special ground earthing line is best. Public grounding method may be adopted. Are prohibited and other equipment series grounding way.

( 2) Shielding ground: general Settings to prevent static electricity, magnetic field induction shell or wire mesh. Through specialized copper wires to be connected to the earth's crust.

( 3) Interact and conservation: N lines of the ac power supply, usually it is the main place of noise. To protect the personal safety and protective equipment leakage. When ac power transmission, in quite some interval power wires. There will be a few mV, or even a few V voltage, the circuit level and low level signal transmission requirements to zero. On dc signal wires to add isolation block: do not allow the signal source share a piece of ground with alternating current (ac) : the ground by earthing bronze together. Shielding, protected area not with power supply, signal and other twisted together. Can independently received grounding on the bronze. In order to reduce the capacitance coupling noise of signal, can use a variety of shielding measures. To the problem of distributed capacitance of electric field shielding through the screen to access the earth can solve. Will cover the earth to access blocked.

2, PLC input and output wiring

PLC power cord, I/O power supply cord, input signal and output signal lines, communication lines, dc lines should be separated as far as possible wiring. Reliable grounding and shielding layer. Due to current in the opposite direction in the twisted pair. So the signal lines use twisted pair or more shielded wire.

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