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METHOD SeqNum
VAR_INPUT
    Value : ULINT; // SeqNum Value
END_VAR
VAR_OUTPUT
    OK : BOOL; // OK
IF Value = 0 OR Value = 255 THEN
    DoReBirth := FALSE;
    _PrevSeq := Value;
ELSIF Value = (_PrevSeq + 1) THEN
ELSE
    DoReBirth := TRUE;
END_IF
IF DoReBirth THEN
    _PrevSeq := 0; // Reset previous received BDSeq
OK := (DoReBirth = FALSE);