1, plus 1:1 signal isolator
2, add magnetic ring
3, PLC power supply plus isolation transformer
4. The switching signal and the analog signal are separated separately;
5, the analog signal is best to use a separate shielded line. The signal type is preferably 4-20mA;
6, the analog signal load is a solenoid valve type, it is best to choose 1.5 line;
7. The analog signal and the digital signal cannot use the same multi-core cable, and the cable cannot be shared with the power cable.
8, PLC input and output signal line, must use shielded cable, suspended on the input and output side, and grounded on the PLC side;
9. Signal cables should be kept away from strong interference sources such as inverters, high-power silicon rectifiers and large-scale power equipment;
10. The analog signal and the digital signal cannot be combined with the same multi-core cable, and the cable cannot be shared with the power cable.
11. In order to reduce electronic interference, for analog signals, twisted-pair shielded cable should be used. The shield of the analog signal cable should be grounded at both ends. However, if there is a potential difference at both ends of the cable, the wire connection current will be generated in the shield to cause an analog signal. Interference In this case you should ground the end of the shield of the cable.
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