Which instruction is used to unlatch an output?

The instruction used to unlatch an output is the Output Unlatch (OTU) instruction. This instruction is specifically designed to turn off or reset an output that has previously been latched on by an Output Latch (OTL) instruction.

When an output is latched, it remains in the 'on' state even after the conditions that turned it on are removed. The OTU instruction effectively clears this latched state, allowing the output to return to 'off' when the conditions for it to remain on are no longer met or when the unlatch operation is explicitly called for. This is particularly useful in control processes where outputs need to be controlled based on specific conditions and require an explicit action to reset them.

The understanding of output instructions is crucial in programming logic controllers, as it relates to the maintenance of the correct states of various devices in an automated process. In contrast to this instruction, other choices serve different functions: the Output Energize (OTE) instruction turns on an output, the Output Latch (OTL) instruction sets the output to a latched state, and the Examine If Closed (XIC) instruction is used for evaluating input conditions. Therefore, in the context of unlatching outputs, OTU is specifically