Modbus
Widely used serial fieldbus for all applications
Overview
Features
pIntroduced in 1979 by Schneider Electric (Modicon), the Modbus® fieldbus is an essential, open communication standard, supported by a large number of products and vendors on the market today.br / With over 7 million nodes in North America and Europe alone, Modbus is the de facto standard in multi vendor integration./pp In a typical Modbus network, messages are sent over an RS232/RS485 serial communication link (EIA standard). The Modbus protocol is based on a master/slave principle, eg. the master sends a request and the addressed slave sends back a response./ppAs Modbus is a protocol which is independent of the physical network layer, Modbus serial line can be integrated seamlessly into Modbus TCP networks, using simple gateways. This is transparent for the Client application. /ppstrongTechnical characteristics:/strong/pul liUp to 247 devices in one network /li liUp to 1km network range /li liBroadcast messaging supported /li liStandard cabelling /li/ul
Benefits
A "de facto" standard and the most widely used network protocol in the industrial manufacturing environment
- Open communication standard
- Easy device integration at low cost
- Easy integration of new equipment to installed base
- Widely supported by SCADA and HMI software
- Wide distributed knowledge base
Applications
- Modbus serial line can be used in virtually all applications. Examples reach from small low cost simple I/O devices to the configuration port and control of variable frequency drives. Actually Modbus serial line is used to collect data from distributed power meters.
- PLCs (Series 7, Series 1000, Modicon TSX Micro, Premium, Quantum, Momentum, Compact, Twido)
- Most Telemecanique devices