Process voltage too low

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The measured process voltage supplied to the safety I/O module is below the minimum permissible limit. This indicates an undervoltage condition from the external power source feeding the module's process voltage inputs. This is a severity 3 error.

• The voltage supplied to the process or device is lower than the required operating level.
• Undervoltage condition from the power supply.
• Loose connections or high resistance in wiring.
• Faulty power supply or battery.

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1. 1

   Measure the process voltage at the relevant terminals of the I/O module to verify the input voltage level.