Modicon Modbus Protocol Reference Guide

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1ModiconModbus ProtocolReference GuidePI MBUS 300 Rev. JDOK-3ModiconModbus ProtocolReference GuidePI MBUS 300 Rev. JJune 1996MODICON, Inc., Industrial Automation SystemsOne High StreetNorth Andover, Massachusetts 01845PI-MBUS 300PrefaceiiiPrefaceThis Guide is written for the person who will use Modicon Modbus protocols andmessages for communication in Modicon programmable controller describes how messages are constructed, and how transactions take placeusing Modbus Guide should be used in conjunction with Modicon user guides for the typesof networks and programmable controllers present in the application.

This guide is written for the person who will use Modicon Modbus protocols and messages for communication in Modicon programmable controller applications. It describes how messages are constructed, and how transactions take place using Modbus protocol. This guide should be used in conjunction with Modicon user guides for the types

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