How to reduce EMC hazards in I/O module field wiring

Reducing EMC hazards in I/O module field cabling requires adherence to systematic engineering standards. First, all cabling should have clear diagrams and markings, with different colors or labels used for different cable types. Strictly follow specifications for cable separation, laying power, control, and communication cables in separate channels and maintaining safe distances. All cables should be laid along grounded metal surfaces such as cabinets and channel steel as much as possible and securely fixed, avoiding suspension. Shielded cables must have their shielding layer correctly grounded at one or more points as required, with reliable and low-impedance grounding connections.

Cable bending radii should not be too small to avoid damaging the shielding layer. Terminal blocks should be secure, without looseness or burrs. For long cables, label them at appropriate locations at both ends and in the middle for easy maintenance and troubleshooting. During system commissioning, all I/O signals should be powered on and noise checked, such as monitoring analog signal fluctuations during power equipment start-up and shutdown. Regularly inspect the cabling system to check for loose connections and damaged shielding. Good field cabling is the foundation for long-term stable system operation.