Monitor system for operation of solenoid operated devices

摘要: Command words with address signals are transmitted periodically from a control room to field solenoid valves which each provided single actuation circuit. The that be actuated in the correspond of command energize coil corresponding valve. circuit inserts an signal for particular regard current information flowing energized and sends it back as acknowledge word. previously predicts will sent by circuits when properly respond registers predicted reference words. word is compared if inconsistency exists fault indicated. includes N continuously valve test momentarily energizing test. These alternately at predetermined intervals indication result inhibited during time period after alternation address.