Variable forcing now uses limited list and buffer instead of systematical instance tree traversal and in-tree "fvalue" to keep track of forced value for pointed variables (external, located). Pointer swapping is performed when forcing externals and located, with backup being restored when forcing is reset. Match Beremiz commit 93ad018fb602.
FUNCTION_BLOCK AVERAGE
VAR_INPUT
RUN : BOOL ; (* 1 = run, 0 = reset *)
XIN : REAL ; (* Input variable *)
N : INT ; (* 0 <= N < 128 or manufacturer- *)
END_VAR (* specified maximum value *)
VAR_OUTPUT XOUT : REAL ; END_VAR (* Averaged output *)
VAR SUM : REAL := 0.0; (* Running sum *)
FIFO : DELAY ; (* N-Element FIFO *)
END_VAR
SUM := SUM - FIFO.XOUT ;
FIFO (RUN := RUN , XIN := XIN, N := N) ;
SUM := SUM + FIFO.XOUT ;
IF RUN THEN XOUT := SUM/N ;
ELSE SUM := N*XIN ; XOUT := XIN ;
END_IF ;
END_FUNCTION_BLOCK