How to solve crosstalk between multi-core wires in I/O modules?

Addressing crosstalk within multi-core cables for I/O modules requires measures in cable structure, termination, and usage. Prioritize individually shielded twisted-pair cables (i.e., partially shielded twisted-pair cables) to minimize crosstalk. If unshielded multi-core cables are used, different signal types, such as analog and digital, input and output, should be assigned to different pairs or groups and separated by grounding wires whenever possible. During termination, ensure the internal twisted structure of the cable is not excessively damaged before entering the terminal blocks to maintain its anti-interference characteristics.

In circuit design, add RC low-pass filters to sensitive signal lines susceptible to interference at the receiving end. Lowering the output impedance of the signal source and increasing the input impedance of the receiver also helps reduce crosstalk. In software, staggered sampling can be used for channels susceptible to crosstalk to avoid large instantaneous common-mode currents generated by simultaneous switching of all channels. If crosstalk is severe, consider replacing a single multi-core cable with multiple single-pair or double-pair cables. Crosstalk levels can be quantitatively assessed by injecting an interference signal into one core wire and measuring the induced voltage on the other core wires.