Steve,
In the present case two numbers of CPU of 360 series are connected in dual redundant configuration with Max-on software to achieve the redundancy with one power supply module & one communication module for each CPU. Similarly, S7-400 PLC are also connected in redundant configuration. Here, 9030 Series PLC will act as master. Please clarify if i have to consider two numbers of IC693PBM200 (Master) module for connecting two numbers of CP 443-5 (Siemens module to beconfigured as intelligent slave)? To work this configuration, it needs activating the CPU change over of one PLC in case of CPU change over in other PLC. I am not sure, how to do that.