In an Active Low PLC discrete input module, when is the input considered ON?

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Enhance your skills with the PMMI Programmable Logic Controllers (PLC) 1 Test. Dive into multiple-choice questions with detailed explanations. Prepare effectively for your certification!

Multiple Choice

In an Active Low PLC discrete input module, when is the input considered ON?

Explanation:
Active-low inputs are ON when the signal is driven low. The input line is typically pulled up inside the module, so when a sensor or switch pulls the line to ground, the voltage at the input drops toward 0 V. That low level is interpreted as ON. So an active-low discrete input turns ON when there is no voltage (0 V) on the input relative to the common; If voltage is present (a high level), the input is OFF in this configuration.

Active-low inputs are ON when the signal is driven low. The input line is typically pulled up inside the module, so when a sensor or switch pulls the line to ground, the voltage at the input drops toward 0 V. That low level is interpreted as ON. So an active-low discrete input turns ON when there is no voltage (0 V) on the input relative to the common; If voltage is present (a high level), the input is OFF in this configuration.

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