How does the TOF timer function in a control logic system?

The TOF (Timer Off Delay) function in a control logic system is designed to start a countdown when a specific condition goes false. This means that when an input signal or condition that the timer is monitoring transitions from true to false, the timer begins to count down from its preset value. It allows for a controlled delay in the operation of outputs or other processes following the deactivation of an input signal.

The key feature of the TOF timer is its ability to delay the action of outputs that rely on input signals. This delay can be critical for ensuring that processes do not change state immediately when an input ceases to be true, ensuring a gradual transition instead. Understanding this function is essential for designing robust control systems where timing and coordination of processes are crucial.