Voltage test: When the controller operates in RUN mode and the LED status indicator does not illuminate even when the input device is activated, then the voltage test must be performed to predict the error. For this purpose, voltage level must be measured across the input terminals. If the current voltage level is obtained, then the input module must be changed. If the voltage level is not correct, then there might be a possibility of fault in power supply, wiring, or input device.

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Chapter 13, Problem 5P

Program Plan Intro

Voltage test:

When the controller operates in RUN mode and the LED status indicator does not illuminate even when the input device is activated, then the voltage test must be performed to predict the error.

For this purpose, voltage level must be measured across the input terminals.

If the current voltage level is obtained, then the input module must be changed.

If the voltage level is not correct, then there might be a possibility of fault in power supply, wiring, or input device.

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