Troubleshooting and Solutions for I/O Side Alarms on Solidot Slice Remote I/O XB6S PROFINET Coupler

When the PROFINET coupler establishes communication but shows IOE red blinking or MT yellow solid lights, this indicates I/O side alarms. This article details troubleshooting steps and solutions.

1. Unconnected/Improperly Connected Load-Side Voltage

Output modules ( XB6S-0032A, XB6S-0032B, XB6S-1616A, XB6S-1616B, XB6S-0012J/6, XB6S-A04V, XB6S-A08V, XB6S-A04I, XB6S-A08I）and functional modules （XB6S-PL20, XB6S-PL20D, XB6S-PT04A, XB6S-PS20D）require load-side power. Unconnected voltage triggers alarms.

Solution:

• Verify all connections

• Force outputs to test modules

• Check for poor contact or voltage non-compliance

2. Analog Input Overrange

XB6S analog input modules support channel overflow detection.
Solution:

• If exceeding current range but within max range: Adjust range parameters

• If exceeding max range: Inspect sensor signals
  (Overrange doesn’t disable modules)

3. Temperature Module Disconnection Detection

Unconnected channels display "-9999" and trigger alarms.

Solution:

• Disable unused channels in module properties

• If connected but still alarmed:
  → Verify correct sensor type (default: PT100)
  → Select proper type in properties

4. Serial Module Parameter Errors

4.1 Incorrect Node Parameters

Solution: Configure parameters per manual specifications.

4.2 Byte Count Exceeded

Disabled Mode:
Reading 32 registers (64 bytes) exceeds default 32-byte limit.

Solution: Manually increase byte count (max 255 bytes).

High-Level/Rising-Edge Trigger Mode:
Status/alarm codes add 2 bytes per node.

Solution:
→ Increase module byte capacity OR
→ Reduce register count (e.g., change to 15 registers)