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MODBUS TCP/IP Protocol
 

Modbus TCP/IP Unplugged ¨C An introduction to Modbus TCP/IP Addressing, Function Codes and Modbus TCP/IP Networking

1. OVERVIEW
MODBUS TCP/IP is a variant of the MODBUS family of simple, vendor-neutral communication protocols intended for supervision and control of automation equipment. Specifically, it covers the use of MODBUS messaging in an ¡®Intranet¡¯ or ¡®Internet¡¯ environment using the TCP/IP protocols. 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.

The MODBUS TCP/IP protocol is being published as a (¡®de-facto¡¯) automation standard. Since MODBUS is already widely known, there should be little information in this document which could not be obtained elsewhere. 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.

This is done below by grouping supported message types into ¡®conformance classes¡¯ which differentiate between those messages which are universally implemented and those which are optional, particularly those specific to devices such as PLC¡¯s.

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