What value is stored in the memory location when there is no voltage at the terminal?

Study for the Programmable Logic Controller (PLC) Test. Prepare with flashcards and multiple choice questions, each question provides hints and explanations. Get ready for your exam!

Multiple Choice

What value is stored in the memory location when there is no voltage at the terminal?

Explanation:
In digital inputs and PLC memory, a voltage present at the terminal is read as a logical high (1), while no voltage is read as a logical low (0). The memory location simply stores the current input condition, so with no voltage there, it stores 0. This 0 represents the “off” or “false” state in binary logic. Values like 2 or -1 aren’t part of the standard binary input encoding used for this kind of memory.

In digital inputs and PLC memory, a voltage present at the terminal is read as a logical high (1), while no voltage is read as a logical low (0). The memory location simply stores the current input condition, so with no voltage there, it stores 0. This 0 represents the “off” or “false” state in binary logic. Values like 2 or -1 aren’t part of the standard binary input encoding used for this kind of memory.

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