Modbus Protocol Introduction
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Modicon developed the Modbus protocol in 1979 for use in industrial automation systems. It uses a master-slave architecture where the master device like a client computer can query and control slave devices like peripheral machines. The master broadcasts queries to individual slaves or all slaves, and slaves always respond to queries but cannot initiate messages themselves. Modbus allows remote access and control of machinery with accurate and fast output information without human effort for cost savings.
Modbus Protocol Introduction
- 1. Prepared by: Vyas Pratik Marwadi Education Foundation Group of Institution - Rajkot
- 2. ? Developed in 1979 by Modicon ? For industrial automation systems ? Open, public-domain protocol ? Communicate using a master-slave (client- server) technique
- 3. ? Master: device is a Client computer ? address individual slaves or broadcast message ? A master¨s query will consist of a slave info. ? Slave : peripheral device (which get information and sends its output to the master) ? response on all queries ? do not initiate messages on their own
- 4. ? Remotely access Machineries ? Output Information Accurate n fast ? Not require human effort ? Cost saving
- 5. ? 01 - Read Output Table ? 02 - Read Input Table ? 03 - Read Holding Registers ? 04 - Read Input Registers