How do industrial servos and PLCs communicate and coordinate (EMC)?

When servo drives and PLCs form a system, EMC optimization is required through coordinated efforts in installation, wiring, grounding, and parameter settings. Eintec Electronics recommends the following:

1) Common Grounding System: Reliably connect the PLC cabinet and servo drive cabinet to the same grounding system via equipotential bonding copper busbars to eliminate ground potential differences.

2) Communication Cables: Use manufacturer-recommended or certified shielded communication cables (such as PROFIBUS and PROFINET). Ground the shielding layer at both the PLC and servo ends, ensuring continuity.

3) Power Isolation: Use isolated power supplies for the I/O modules of the PLC and servo, or ensure their reference ground potentials are consistent.

4) Filter Installation: Install filters on the servo drive's input power lines to reduce noise feedback to the power grid and avoid affecting the PLC power supply.

5) Parameter Settings: Properly configure communication timeout and retry mechanisms to enhance software anti-interference capabilities.

Systematic coordination can significantly reduce communication interruptions or data errors caused by EMC issues, improving the overall stability of the production line.