After the DCS operator of "Hydrochloric Acid Furnace A" presses the "Emergency Stop" button on the SIS cabinet for 3 consecutive seconds, the interlocking condition for emergency stop is reached.
After the A”DCS operator of "hydrochloric acid furnace A" presses the "emergency stop" button on the SIS cabinet (for 3 seconds continuously), the interlocking condition of emergency stop is reached.