DeltaV SZ Controller

The SZ controller is the proxy (or gateway) between the LSN and the BPCS, and it is certified per Achilles Level 2. The SZ controller isolates the safety-critical components (logic solvers and field devices) from non safety-critical components such as the engineering stations or BPCS nodes. The SZ controller carrier provides 4 Ethernet ports. The top two ports connect to the configuration station and BPCS while the bottom two ports connect to the LSN. It does not execute safety logic, its main function is to isolate the LSN from the BPCS and communicate configuration, parameter changes, and module data to the CSLSs from the engineering station and BPCS. The SZ controller provides the interface to multiple CSLSs on the same LSN. All CSLSs under one SZ controller share the same LSN.

In Standalone applications, the top Ethernet ports provide native Modbus TCP protocol communication to interface to a third party BPCS. In this case, the SZ controller is a Modbus slave device.