The Modbus Protocol of Schneider is a communication protocol originally developed by Modicon, now part of Schneider Electric, in 1979. It allows industrial devices like PLCs, sensors, and computers to exchange data easily. Modbus is an open standard, which means anyone can use it without paying royalties. This openness has made Modbus one of the most widely used protocols in industrial automation.
Modbus works on a client-server model, where a client requests data from a server. There are different versions for different needs: Modbus RTU and Modbus ASCII work over serial lines like RS-232 or RS-485, while Modbus TCP runs over Ethernet using TCP/IP. Schneider Electric PLCs and other devices still support these versions, making Modbus reliable for connecting and controlling industrial systems efficiently.