Field I/O Network Topologies

Modbus TCP communication between PLC and field bus modules CI521-MODTCP or CI522-MODTCP can be done using different network topologies. In the following subchapters different simple combinations with their pros and cons are explained.

Note

If a module of a daisy chain is powered off, next following modules will lose connection/ data provided there is no redundancy in the ETHERNET network (e.g. ring and managed switch). A module board with power is needed to transmit the data.

• Star Topology (Non-redundant field device communication)
• Simple Ring Topology (smaller systems)
• Standard Network Topology (large systems)