Here you go....... It was silly mistake on my part....... messed up with syntax. FormCalc do not like "{, }" instead we use "Then, Endif"var timeStampvar timeOutvar timeInvar Catvar timep1var timep2var StartIntervalif (HasValue($.parent.OUTA1[0]) and HasValue($.parent.INA1[0])) then timeStamp = $.p...