The off-delay timer (TOF) starts timing when the timer's:

A) ladder rung switches from false to true.
B) ladder rung switches from true to false.
C) accumulated value equals its preset value.
D) accumulated value is greater than its preset value.

Off-Delay Timer

An electromechanical relay with contacts that change state a predetermined time period after power is removed from its coil; on re-energization of the coil, the contacts return to their shelf state immediately; also, a programmable logic controller instruction that emulates the operation of the electromechanical off-delay relay.

Ladder Rung

A single line of logic in a ladder diagram that equates to a control circuit, usually comprised of inputs and outputs represented by symbols.