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The Output Latch (OTL) instruction______________.

a. can turn an output on, but it cannot turn the output off
b. is used only to turn a bit on and latch it on.
c. allows the output to remain on even if the rung changes to false.
d. all of these.

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Answer:

d. all of these.

Explanation:

OTL is used in PLC programming. It is a retentive output in nature. The major function of OTL is as mentioned in the options(all of them)  itself. Given that it can only turn on a bit and cannot turn it off it is often used in pair with OTU(output unlatch) where both OTL and OTU  address the same bit.

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