A TOF timer starts to accumulate time:
A)when the rung makes a true to false transition.
B)when the rung makes a false to true transition.
C)when the done bit is set to 1.
D)when the done bit is reset to 0.

Question

Quizplus · Accepted Answer

A TOF (Timer Off-Delay) timer starts to accumulate time when the rung condition goes from true to false. This is because the TOF timer is designed to keep the output on for a specified period after the input turns off.

A TOF Timer Starts to Accumulate Time