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Modbus Master functionality as a part of SCADAPack E configuration was added in version 8.12.2. Nowdays it is possible to use legacy I/O Device way in the Logic, configure it in E Configurator or use dedicated Function blocks.
But many customers are trying to setup the Modbus Master fuctionality without upgrading the firmware of the RTU and facing the issues
SCADAPack E RTUs
Before trying to setup Modbus Client functionality check the SCADAPack firmware version number. It should be above 8.12.2.