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.
- 3
Inspect and test the connected sensors for proper operation and calibration.
Source: ABB AC500-S Safety
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