Must Read : What is Profibus ? How Profibus Work ? Now if we talk about the messaging structure of Modbus TCP/IP it has a 7-byte header called as MBAP header (Modbus Application Header) is added to the start of the message with a PDU (Protocol Data Unit).
Modbus masters referred as clients and Modbus slave as servers.Modbus TCP/IP clients and servers sends and receive Modbus data via port 502. Modbus TCP/IP works on clients and servers model. So in simple words we can say Modbus TCP/IP message is a Modbus communication encapsulated in an Ethernet TCP/IP wrapper. Modbus TCP/IP simply combines a physical layer named Ethernet, with a networking standard named TCP/IP, and a standard method of representing data that is Modbus, all of which combines to carry data of the Modbus message structure between compatible devices. Ethernet/ip is very Powerfull, but it is also complex Must Read : OPC-UA vs DA Modbus TCP/IP vs Ethernet IPĮthernet/IP uses the Ethernet architecture to establish connection between automation devices like PLCs,DCS, sensors,industrial machines.Įthernet/IP managed by the Open DeviceNet Vendors Association (ODVA) and is based on the Common Industrial Protocol (CIP). Must Read : Modbus ASCII Vs Modbus RTU Vs Modbus TCP/IP The combination of TCP/IP can simply be called as a transport protocol which does not define what the data means or how the data can be interpreted, but Modbus along with TCP/IP as an application protocol can be used to interpret the data.
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