For system expansions with SIMATIC PCS 7, the existing SIMATIC S5 system architecture is extended, i.e., the S5 operator panel or SCADA system is retained and operates in parallel with the HMI of the connected SIMATIC PCS 7 architecture. The SIMATIC S5 PLCs are connected to the SIMATIC PCS 7 controllers as slaves, which expands the available functions of the existing automation system to include alarm management, asset management, and even graphical visualization. The existing process I/O are retained in this case.
In a migration of SIMATIC S5 controllers with retention of the S5 input/output modules, the existing SIMATIC S5 CPUs are replaced with modern SIMATIC S7-400 CPUs. The S5 ET 200U input/output modules can be connected directly to the new system via PROFIBUS DP. The IM 463-2 interface module can be used to establish a connection between a modern S7-400 controller and other S5 input/output modules.