Transcription of Introduction to Modbus TCP/IP
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Introduction to Modbus TCP/IP
BusWorks 900EN Series 10/100M Industrial Ethernet I/O Modules w/ Modbus Technical Reference Modbus TCP/IP Introduction TO Modbus TCP/IP ACROMAG INCORPORATED Tel: (248) 624-1541 30765 South Wixom Road Fax: (248) 624-9234 BOX 437 Wixom, MI 48393-7037 Copyright 2005, Acromag, Inc., Printed in the USA. Data and specifications are subject to change without notice. 8500-765-A05C000 Introduction To Modbus TCP/IP _____ _____ Acromag, Inc. Tel:248-624-1541 Fax:248-624-9234 2 Introduction TO Modbus TCP/IP Modbus AND Modbus 3 What is Modbus ?.. 3 What is Modbus TCP/IP ?.. 4 Why Combine Modbus With Ethernet?.. 5 What About Determinism?.. 6 THE OSI NETWORK 7 TCP/IP 9 Key Concepts & 12 APPLICATION 13 Modbus Functions & 13 Read Coil Status (01).
Modbus devices communicate using a master-slave (client-server) technique in which only one device (the master/client) can initiate transactions (called queries). The other devices (slaves/servers) respond by supplying the requested data to the master, or by taking the action requested in the query. A slave is any peripheral device (I/O transducer,
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