Defect when processing F-IO

What does C01712 mean?

This alarm indicates a defect occurring during the processing of Fail-safe I/O (F-IO). This suggests a problem with the safety-related input/output circuitry or its configuration, potentially compromising safety functions if not addressed.

• Short circuit, open circuit, or wiring fault detected on a fail-safe input (e.g., emergency stop button wiring issue).
• Deviation in redundant fail-safe input signals (e.g., discrepancies between Channel 1 and Channel 2 of an F-DI).
• Incorrect configuration of fail-safe parameters (e.g., F-monitoring time P3100, F-input type P3105) for the connected safety devices.
• Internal hardware defect within the fail-safe I/O module or a communication fault with the safety CPU.
• Undervoltage or overvoltage condition on the 24VDC safety supply rail, affecting the proper operation of the F-IO module.

Click steps to track your progress.

1. 1

   1. Measure the voltage at the terminals of the affected fail-safe input (e.g., X124/1 and X124/2 for F-DI) to confirm expected signal levels (e.g., 24VDC for ON, 0VDC for OFF).

2. 2

   2. Isolate the specific F-IO module or input by reviewing diagnostic messages or observing module LEDs to pinpoint the exact failing channel.

3. 3

   3. Verify the wiring integrity of the entire fail-safe circuit, checking for conductor breaks or insulation damage between the safety device and the F-IO module.

4. 4

   4. Compare the configured fail-safe parameters (e.g., P3090, P3105, P3120) with the actual wiring and safety circuit design documentation.

5. 5

   5. Perform a continuity test on the safety input cables (e.g., between terminal 1 and 2 for a two-channel input) with all power removed from the system.

6. 6

   6. Check the 24VDC auxiliary supply voltage at the F-IO module's power terminals (e.g., L+ and M) to ensure it is within specified limits (e.g., 22VDC-28VDC).