How many no of Modbus RTU slaves can be considered in a Modbus TCP/IP communication Card in AC 800 M controllers
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ABB recommends not to use more than 4 Modbus RTU slaves through single Modbus TCP/IP to serial converter.
Please see pg 93 of doc "3BSE035982-510_en_AC_800M_5.1_Communication_Protocols.pdf ".
However it can be increased depends on slave response time but 32 modbus RTU Slaves through single Modbus TCP/IP to serial converter seems to be not feasible.