The TOF is a nonretentive instruction.

Question

Quizplus · Accepted Answer

The TOF (Test Overflow Flag) instruction is a nonretentive instruction in PLC programming. It checks the overflow flag in the processor's status word and sets the result bit to 1 if the flag is set, or to 0 if it is not set. The nonretentive instruction means that it does not hold or store any data after execution. The TOF (Time-of-Flight) instruction is nonretentive, meaning it does not store values between scans. It simply calculates the time it takes for a signal to travel from a sensor to an object and back, and outputs that value.

The TOF Is a Nonretentive Instruction