220VAC relay interference voltage issue
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Dear colleagues: I am working on a project where some control cables (unshielded) have to be laid together with power cables due to site conditions. Since the Siemens DI modules operate at 220VAC, this results in interference of 48–60VAC in some of the DI signal channels. I plan to use 220VAC relays to address this issue; for the relay coils, I chose those equipped with diodes and RC circuits. However, the relays are still affected by interference, and it is now no longer possible to reproduce the cable layout. Do any of you have solutions to this problem? Thank you
The Siemens PLC is powered by an isolation transformer
AC models have significant interference; it is recommended to use DC models instead.