Analysis and Prevention of Abnormal Shutdown Caused by Switch Network

Unit 1 and unit 2 of a company tripped because the root switches of two units were connected. Due to the "BYPASS" function in the industrial intrusion detection system in the safety protection system, when the "BYPASS" function is activated in the state of power loss, the two network interfaces (No. 1 and No. 2) on the industrial intrusion detection system are physically connected, and the security switch in the safety protection system of unit 2 is not configured. At this time, the whole safety protection system becomes a conduction loop, the root switch of the DCS system of unit 1 and unit 2 is connected, and the SID address of some parameters in the DCS system of the two units is the same, resulting in data conflict in the DCS system of unit 1 and unit 2. As a result, the 0/1 state of switch measurement point of Unit 1 "backpressure overlimit jumper 1", "backpressure overlimit jumper 2" and Unit 2 "backpressure overlimit jumper 1" are flipped. Error signal command is issued, unit 1 and 2 trip out of column.