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How to get real-time THD Parameters from ION 7550 via ModBus?
Metering & Power Quality
Schneider Electric support forum about Power Meters (ION, PowerTag, PowerLogic) and Power Quality from design, implementation to troubleshooting and more.
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This will involve programming ION Modules in the 7550. This is done either with the Designer app in SPM/PME or with ION Setup.
You would create new ION Modbus Slave modules, configure the module(s) as to data type, Modbus base register value for the Module, etc and link the data you want to expose to them as inputs to the module(s). The 7550 supports up to 20 Slave Modules and the default framework uses 5 so these is lots of capability available.
I have attached a document that shows how to use ION Setup to program ION Modules. While the example is completely different as to the functions done I think it will give you an idea on how to proceed.