CI853 and CI867 Slave Capacity
How many slave devices I can connect to one CI853 or CI867 module and is there any data limit to communicate?
CI853 is RS232C Interface Card, so if you want to implement a Point-to-Point Communication, you only connect one slave.
As an alternative way, you implement a Multidrop Communication you have to use, RS232-C converter and at this time you can communicate upt 247 slaves.
For CI867 Modbus TCP Card please see below picture:
ABB recommends not to use more than 4 Modbus RTU slaves through single Modbus TCP/IP to serial converter.
For more details please refer to "3BSE035982-510_en_AC_800M_5.1_Communication_Protocols.pdf " document.
Hope it helps you.