However, an attempt has been made to clarify which functions within MODBUS have value for interoperability of general automation equipment, and which parts are ‘baggage’ from the alternate use of MODBUS as a programming protocol for PLC’s. Since MODBUS is already widely known, there should be little information in this document which could not be obtained elsewhere. The MODBUS TCP/IP protocol is being published as a (‘de-facto’) automation standard. The most common use of the protocols at this time are for Ethernet attachment of PLC’s, I/O modules, and ‘gateways’ to other simple field buses or I/O networks. Specifically, it covers the use of MODBUS messaging in an ‘Intranet’ or ‘Internet’ environment using the TCP/IP protocols. MODBUS TCP/IP is a variant of the MODBUS family of simple, vendor-neutral communication protocols intended for supervision and control of automation equipment. An Introduction to MODBUS TCP/IP Modbus TCP/IP Unplugged – An introduction to Modbus TCP/IP Addressing, Function Codes and Modbus TCP/IP Networking
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