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. Familiaritywith your network layout, and with your control application, is data and illustrations in this book are not binding. We reserve the right tomodify our products in line with our policy of continuous product in this document is subject to change without notice and should notbe construed as a commitment by Modicon , Inc.

PI-MBUS–300 Preface iii Preface This guide is written for the person who will use Modicon Modbus protocols and messages for communication in Modicon programmable controller applications.

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