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The C300 performance model estimates the XUs required to support IO, when provided with estimates for the above factors. The LU estimation worksheet contains all the details needed to estimate the LUs associated with a given IO Link and its complement of PM IOPs or Series C IOMs. To summarize, the number of LUs is dependent on the following items. • Link Type - PM IO or Series C IO • Number of IO Modules, and for each its type (AI, AO, DI, DO, etc.), scan rate, and redundancy configuration • Number of AO connections – quantity and rate • Number of DO connections – quantity and rate • Number of SCM reads and writes per second of IO Link data 2.3.4.4 C300 Communication Performance testing has determined that the following factors have the greatest influence on the amount of CPU used to communicate with peer nodes and displays. A conscious effort has been made to keep the number of input factors to a minimum to keep the C300 performance model as simple as possible while maintaining its usefulness and accuracy. The model has been refined to the point that only these major factors need be input to the spreadsheet. The XUs required to support the specified communications are calculated automatically from these inputs. • # of Peer Connections (node type is not critical) – nodes considered as peers include C300, C200, ACE, FIM4 • # of Console Stations associated with Experion Server/cluster • # of Parameters per second for display throughput • # of Messages per second o # Messages/second is calculated from the number of Exchange blocks, Push block stores, and SCM block stores that initiate and respond to requests The number of Notifications per second generated by a C300 is an example of a factor not included in the model because it is not significant when compared to the other factors listed above.