Fixed __SET_EXTERNAL_FB declaration in accessor.h, invoked when accessing EXTERNAL_BLOCK.VARIABLE. Macro was invoking __SET_VAR with wrong parameter count. Fixed corresponding code generator for ST. Seems similar codegen for IL is also broken, but fix would affect other (unknown) behviours -> didn't touch it.
FUNCTION_BLOCK HYSTERESIS
(* Boolean hysteresis on difference *)
(* of REAL inputs, XIN1 - XIN2 *)
VAR_INPUT XIN1, XIN2, EPS : REAL; END_VAR
VAR_OUTPUT Q : BOOL := 0; END_VAR
IF Q THEN IF XIN1 < (XIN2 - EPS) THEN Q := 0; END_IF ;
ELSIF XIN1 > (XIN2 + EPS) THEN Q := 1 ;
END_IF ;
END_FUNCTION_BLOCK