How many no of Modbus RTU slaves can be considered in a Modbus TCP/IP communication Card in AC 800 M controllers
As part of Modbus TCP/IP Card Sizing, I am considering 32 modbus RTU Slaves in a single Modbus TCP/IP Card through a single Modbus TCP/IP to serial Converter, Please confirm me is it with in the limit? what are the limitation are there other than the slave count?
Asked 8 years ago
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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.
Answered 8 years ago
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1
Hi,
A Maximum of 70 Slave and 8 master units per CI867 ( on Ch1 and Ch2 together) can be used .
Please refer the Page no 178 for more information in 3BSE038018-510_-_en_System_800xA_5.1_System_Guide_Functional_Description[1]mann
ual .
Regards
Ravi kant Gupta
Answered 8 years ago
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