Connecting to Modbus Full-Duplex in Premium Hot Standby Configuration
(Original Document)
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General
Two Premium PLCs in a Hot Standby configuration are connected in Full-Duplex mode to the common target through TSX SCP 114 cards an a branching device TSX SCA 64.
NOTE: TSX SCP 114 card version must be ≥ V3.3
Wiring Connection Example
The following drawing shows an example wiring connections for two Premium PLCs in a Hot Standby configuration to the Modbus bus in Full-Duplex mode: 
1
TSX SCA 10 End of line adaptor 
2
Slave 
3
Bus 
4
TSX SCP CM 4530