55

Channel value difference too high

ABB · AC500-S Safety

What does 55 mean?

A significant discrepancy has been detected between redundant input channels, exceeding the configured tolerance window. This implies a potential sensor malfunction, wiring issue, or configuration error that could compromise the integrity of safety-critical inputs.

Additional Steps

Steps 1–2 are listed in Priority Fix.

  1. 3

    Inspect and test the connected sensors for proper operation and calibration.

Source: ABB AC500-S Safety
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