OTL is used for:

OTL, or Output Latch, serves a critical function in programmable logic controllers (PLCs) and control systems. It is designed to hold or "latch" an output state based on a specific input condition. When the input condition that triggers the OTL instruction is activated, the output is set to a high state and remains in that state even if the input condition is no longer present. This behavior is particularly useful in applications where it is necessary for a system to maintain an active state until explicitly reset or turned off by a different command.

This function makes OTL vital in control applications that require outputs to remain active independently of the triggering input, ensuring that processes such as motor operations or alarms remain engaged until deliberately reset. Latching outputs like OTL are often used in scenarios where safety and system integrity depend on maintaining a certain state even through changes in input conditions.