Electrician Red Seal · Question
An electrician is commissioning a new HMI for a water treatment plant. Operators report that the tank level (current value: 5.5 m) displayed on the HMI does not match the local gauge reading (current value: 4.8 m), although the pump status display is correct. What should the electrician first suspect?
If one analog value (tank level) is incorrect while another digital status (pump) is correct, it strongly suggests a problem with the scaling or calibration of
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Question: An electrician is commissioning a new HMI for a water treatment plant. Operators report that the tank level (current value: 5.5 m) displayed on the HMI does not match the local gauge reading (current value: 4.8 m), although the pump status display is correct. What should the electrician first suspect?
Answer options:
- A fault in the PLC's output module. ✅ Incorrect scaling or calibration settings for the level sensor's input in the PLC or HMI.
- A wiring error to the pump control circuit.
- A network connectivity issue between the PLC and the HMI.
Correct answer: Incorrect scaling or calibration settings for the level sensor's input in the PLC or HMI.
Explanation: If one analog value (tank level) is incorrect while another digital status (pump) is correct, it strongly suggests a problem with the scaling or calibration of that specific analog input. A network issue would likely affect all data, and wiring errors to the pump or PLC output faults would explain pump status issues, not level display discrepancies.
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