T8311 Redundant Control System

The T8311 includes two 414-4hcpu, two redundant power supply templates, and two redundant cp443 network cards. One cpu (main) participates in the control during normal operation, and the other cpu (spare) is synchronised with it through the synchronisation module. When failures of the main cpu, rack, power supply, communication, etc. are detected, the spare cpu is immediately put into control without affecting the continuity of the production control.

T8311 adopts remote i/o mode, according to the actual number of i/o points configured with 2 et200m intelligent remote i/o station, remote intelligent i/o station and controller using redundant profibus bus communication. The decompression control station selects siemens s7-200 plc control system, and installs human-machine interface for local operation and setting relevant parameters. Decompression control station using em277 and gas cabinet control station to achieve network communication, gas cabinet control station for the system master.

The T8311 system network is divided into three levels: field level, control level and monitoring level, and the system network structure is shown in Figure 1. the field level uses profibus dp redundancy fieldbus for communication, which mainly realises the data transmission between the s7-400h master station and the remote intelligent slave station, and adopts Siemens twisted-pair cable with a transmission rate of up to 12mbps. the control level realises data exchange between the s7-400 plc and the s7-200plc, and uses Siemens twisted-pair cable to transmit data between the s7-400 plc and the s7-200plc. 200plc data exchange between the s7-400 plc and s7-200plc, using profibus dp bus for communication, s7-400 plc redundant profibus dp bus and s7-200plc single bus using y-link conversion module for bus automatic conversion