Pulse Falling Edge Coil

Pulse falling edge coils or "Negative" coils enable Boolean output of a connection line Boolean state.
ldr_pfec1
Left Connection
Right Connection
The associated variable is set to TRUE when the Boolean state of the left connection falls from TRUE to FALSE. The output variable resets to FALSE in all other cases. The state of the left connection is propagated into the right connection. The right connection can be connected to the right vertical power rail.
Example
ldr_pfec2
(* ST Equivalence: *)
IF (NOT(input1) and input1prev) THEN

         output1 := TRUE;

ELSE

         output1 := FALSE;

END_IF;

(* input1prev is the value of input1 at the previous cycle *)
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