Error light blinking in M580

[MrBong]

Error light is blinking in I/O modules. I am using M580 plc and this is M580 remote drop. Everything was in working condition and even all feedback & commands were working, After few months this problem started. I gave power cycle but the problem didn't solved.

[Trinxs1]

Please check to see what has recently changed.  It seems odd that you have two ethernet cables one plugged into the service port (ETH1 - No RSTP) and the second into the control port (ETH2 - RSTP).  I would expect to see two cables connected to both control ports (ETH2 & ETH3).  

If the cable in the service port is part of the main ERIO I would move the cable from the service port to the control port (ETH3).

If the cable is connected to devices downstream of the CPU, I would consider:

1. check your 24VDC supply.

2. Check your ethernet cables.

3. See if a new switch or something else has been placed in the main ERIO ring.  Only the DRS switch should be placed in the main ERIO ring.