The Negative Edge Trigger (NDE) function block generates a True (1) discrete pulse output when the discrete input makes a negative (True-to-False) transition since the last execution of the block. If there has been no transition, the discrete output of the block is False (0).
The Negative Edge Trigger function block supports signal status propagation. There are no modes or alarm detection in the block.
IN_D is the discrete input value and status.
OUT_D is the discrete output value and status.
The following figure shows the internal components of the Negative Edge Trigger function block:
