In the automatic control system of PLC and inverter, the following items should be paid attention to
1. PLC power supply and power system power supply (inverter power supply) are equipped respectively, and the power supply of PLC should select the blocking transformer;
2. The power line shall be separated from the signal line as far as possible, and the signal line shall be shielded;
3. Whether it is analog signal input or analog signal output, analog channel uses signal blocking module;
4. PLC program to do software filtering planning;
5. Signal ground and power ground are planned separately. PLC control cabinet manufacturers are used for logic control, mainly for the organization of the action process control;
Now in the automatic control system, the frequency converter of low-voltage distribution cabinet supplier is more and more widely used. As a professional integrator of power equipment, engineers of Xiangke often integrate the frequency converter and PLC in the same or adjacent cabinet, and the motor initiates the control box, which will cause the frequency converter to disturb the PLC analog quantity and form the instability of data collection or other shortcomings.