Power-On Analog Value Check Error
Beckhoff · TwinSAFE Logic FB
What does GROUP Value 4 mean?
On startup, at least one analog TwinSAFE function block input deviates from its last saved value (Power-On Analog Value Check Error). This indicates an inconsistency in analog safety input signals during the system's power-on self-test, which could signify sensor drift, wiring issues, or faulty input modules. This prevents the system from starting safely.
Additional Steps
Steps 1–2 are listed in Priority Fix.
- 3
Review the 'Power-On Analog Value Check' settings in the TwinSAFE configuration to ensure appropriate tolerances are set.
- 4
Monitor the actual analog input values during startup using diagnostic tools to identify the deviating signal.
- 5
If the issue persists, inspect or replace the relevant analog input terminal (e.g., EL3xxx/EL4xxx) or the safety module itself.