Using the I/O System Debug View

Purpose

Used to diagnose communication issues between the Main Module, I/O Modules, and PC.

Common Alarms

• I/O IOM Reset
  Module lost and regained power
  → Check for loose cable or intermittent connection

• I/O No IOM Response
  Module not responding to Main Module
  → Possible disconnection or hardware failure

• Lost Communication Link
  Module failed to link properly
  → Often caused by startup changes or loose cables

Key Checks

• Open Debug View → Look for Error Counters > 0
• Identify:
  • Affected module
  • MM Port Number
• Check I/O Modules tab for details

✅ Normal condition: All error counts = 0

Troubleshooting Steps

1. Check Connections

   • Reseat all RJ45 (Cat5) cables
   • Ensure connections are secure

2. Replace Module Cable

   • Swap cable to affected module

3. Replace PC Cable

   • Try new cross-over cable

4. Replace I/O Module

   • If errors persist

5. Replace Main Module (Last Resort)

Escalation

If unresolved:

• Capture screenshots (during alarm)
• Gather error details + files
• Document issue and actions taken
• Send to Technical Support

Notes

• Cat5 cables provide both power and communication
• Most issues = loose or faulty connections