Modicon M580 dPAC Immunity to Radio Frequency

[Eyanto]

Hi all, need clarification on M580 dPAC immunity to radio frequency.

We are working on a project using M580 dPAC components as listed: -

• BMED581020 - M580 CPU Level 1
• BMEXBP1200 - PLC 12 slots Ethernet backplane
• BMXCPS3500 - X80 AC Power Supply Module, 100…240 V AC, 36W
• BMXDDI3202K - X80 Digital Input Module, 32 channels, 24 V DC, Positive (sink)
• BMXDDO3202K - X80 Digital Output Module, 32 channels, 24 V DC, Positive

During the radio frequency interference (RFI) test conducted with a walkie-talkie in close proximity and the panel door open, the controller unexpectedly rebooted when the walkie-talkie was transmitting. In contrast, no abnormal behavior was observed during radio reception.

We are using Mototrbo XiR P6600i, NKP model. It supports bands and frequencies as listed: -

• Band: VHF, Freq: 136 - 174 MHz
• Band: 350, Freq: 350 - 400 MHz
• Band: UHF, Freq: 403 - 527 MHz

With reference Modicon M580, M340 and X80 I/O Platforms Standards and Certifications document no. EIO0000002726.05 11/2023, stated on radio frequency electromagnetic field tests, the standards and levels. Kindly refer to the extracted relevant pages from the document. 

Could it be due to insufficient shielding or grounding? Kindly share your experience on how to overcome this situation. Thanks a lot.