Output Unlatch
OTU
is one of the building blocks of a ladder diagram. The
OTU block implements the OTU
ladder instruction. When the
rung condition is true, the block clears the operand tag (data bit) to false. When the rung
condition is changed to false, the block does not change the status of the data bit. It is
generally used after the OTL block to unlatch the state and disable the rung.