I am trying to size an OPC DA Interface. The 'buffer and bandwidth calculation spreadsheet' references two custom buffer settings [MAXTRANSFEROBJS $ SENDRATE] I cannot locate any documentation on these parameters.
The spreadsheet which is currently available on the Tech Support site and which you are referencing is slightly outdated (it was created for use mainly with PI Buffer Subsystem version 3.4.380). If you are using the latest version of PI Buffer Subsystem (or at least 4.3+), there is a feature called 'autotuning', which will automatically optimize the throughput of events sent based on the network conditions. With autotuning, there is less need to manually adjust the parameters MaxTransferObjs and SendRate. An updated buffering spreadsheet is in the works and should be published soon.
That being said, here are what each of the parameters MaxTransferObjs and SendRate mean:
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