Modbus RTU
Topology: Linear/Bus
Media: Shielded twisted pair
Data Rates: 9.6-116 Kbps
Distance with no repeaters: 4000 feet - RS485
# of Nodes: 250
Communication: Acyclic Master/Slave
Modbus TCP
Topology: Linear/Bus/Tree/Star/Ring
Media: Cat 5/Cat 6, 10baseT, 100baseT, fiber
Data Rates: 10/100Mbps
Distance with no repeaters: Depends on media
# of Nodes: 250/network, Limited to Subnet mask
Communication: Acyclic Client/Server
Devicenet
Topology: Linear/Bus/Tree
Media: Double shielded twisted pair Power included in cable
Data Rates: 126/260/600 Kbps
Distance with no repeaters: 600m - 126Kbps, 100m - 500Kbps
# of Nodes: 83
Communication: Explicit (acyclic), Polled (cyclic), Bit Strobed, Change of State, Master/Slave
EtherNet/IP
Topology: Linear/Bus/Tree/Star/Ring
Media: Cat5/Cat 6, 10baseT, 100baseT, Fiber
Data Rates: 10/100Mbps
Distance with no repeaters: Depends on media
# of Nodes: Limited to Subnet mask
Communication: Explicit (acyclic), Implicit (cyclic), Client/Server