If you want to know when one or both matching bits in two different words are on you would use the logic instruction

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Multiple Choice

If you want to know when one or both matching bits in two different words are on you would use the logic instruction

Explanation:
The concept being tested is how a bitwise OR behaves when you want to know if at least one corresponding bit in two words is on. OR examines each bit position and outputs a 1 if either input bit is 1. So the result shows a 1 whenever one or both of the bits being compared are on. For example, comparing 1010 and 0101 bit by bit yields 1111, because every position has at least one 1. In PLC terms, this means a coil would energize if either of the conditions is true. Contrast with AND, which requires both bits to be 1; NOT is a single-bit inversion; and XOR produces a 1 only when exactly one of the bits is 1. Therefore, to detect that at least one of the two bits is on, you use the OR instruction.

The concept being tested is how a bitwise OR behaves when you want to know if at least one corresponding bit in two words is on. OR examines each bit position and outputs a 1 if either input bit is 1. So the result shows a 1 whenever one or both of the bits being compared are on.

For example, comparing 1010 and 0101 bit by bit yields 1111, because every position has at least one 1. In PLC terms, this means a coil would energize if either of the conditions is true.

Contrast with AND, which requires both bits to be 1; NOT is a single-bit inversion; and XOR produces a 1 only when exactly one of the bits is 1. Therefore, to detect that at least one of the two bits is on, you use the OR instruction.

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