Function Block TOF

The Function Block TOF is a switch-off delay.

Note: The times of the function block are absolute. This means that after a restart or server failure, the same reaction occurs.

Input IN

The input activates the switch-off delay for the time PT when changing from true to false.

Input PT

Defines the time in T#, which elapses after the input IN changes to false.

Input RESET

If the input is true, the delay is stopped and the output ET is reset to T#0ms. The output Q remains equal to the input IN.

Output Q

The output switches with the input IN simultaneously to true. If the input IN changes from true to false, the output changes to false after the delay time PT has elapsed.

Output ET

The output of type T# is equal to T#0ms, if the input IN is true. If the delay is active, the output counts up until the switch-off delay has elapsed. After this time, ET is equal to the input PT.

Warning: Using the output ET leads to increased PLC load.