What is the difference between Modbus, Modbus Plus, and ModbusTCP/IP?


#1

What is the difference between Modbus, Modbus Plus, and ModbusTCP/IP?


#2

Modbus is a serial master/slave protocol. Modbus can run over any serial type
media (copper, fiber, wireless, modem, etc…)

Modbus Plus is a peer-to-peer protocol which runs at 1 mbs. The Modbus Plus
protocol specifies the software layer as well as the hardware layer. Proprietary
cabling and terminators must be used with a Modbus Plus network.

ModbusTCP/IP is an EtherNet based protocol. ProSoft Technology’s ModbusTCP/IP
products act in a master/slave capability.


ICS protocols for factories