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Micromod MOD: Modcell 2050R MODBUS Communications User Manual

Page 3

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IB-23C650M

CONTENTS

CONTENTS

Page

Introduction

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

1

About This Supplement

. . . . . . . . . . . . . . . . . . . . . .

1

About Modbus Communications

. . . . . . . . . . . . . . . .

1

Installation

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3

Controller Option Requirements

. . . . . . . . . . . . . . . .

3

2-Wire Modbus Network Connections

. . . . . . . . . . . .

3

4-Wire Modbus Network Connections

. . . . . . . . . . . .

5

Communication Applications . . . . . . . . . . . . . . . . . . . . . .

9

Standard Control with Modbus Communications

. . . .

9

Supervisory Control

. . . . . . . . . . . . . . . . . . . . . . . .

9

Computer Control

. . . . . . . . . . . . . . . . . . . . . . . . . .

10

RS-485 Communications Setup

. . . . . . . . . . . . . . . . . . .

11

Basic Operation With a Host Device

. . . . . . . . . . . . . . . .

27

Enabling Write Communication With a Host

. . . . . . .

27

Standard Communication With a Host

. . . . . . . . . . . .

27

Supervisory Station

. . . . . . . . . . . . . . . . . . . . . . . . .

29

Computer Auto/Manual Station

. . . . . . . . . . . . . . . . .

30

Diagnostic Messages

. . . . . . . . . . . . . . . . . . . . . . .

31

Modbus Protocol . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

33

Communications Speed

. . . . . . . . . . . . . . . . . . . . . .

33

Message Response Time

. . . . . . . . . . . . . . . . . . . .

33

Messages Supported

. . . . . . . . . . . . . . . . . . . . . . .

34

Message Formats

. . . . . . . . . . . . . . . . . . . . . . . . . .

36

Controller Attribute Listing - Register Data

. . . . . . . . . . . .

39

Common Data (registers)

. . . . . . . . . . . . . . . . . . . .

39

Ramp/Soak Profile and Totalizer Data (registers)

. . . .

42

Tuning Parameter Data (registers)

. . . . . . . . . . . . . .

44

Alarm Data (registers)

. . . . . . . . . . . . . . . . . . . . . . .

46

Computer Activity Data (registers)

. . . . . . . . . . . . . .

47

Ramp/Soak Profile Configuration Data (registers)

. . . .

49

More Computer Activity Data (registers)

. . . . . . . . . .

51

Controller Attribute Listing - Coil Data

. . . . . . . . . . . . . . .

55

Computer Activity Data (coils)

. . . . . . . . . . . . . . . . .

55

Digital Input and Output Data (coils)

. . . . . . . . . . . . .

56

Ramp/Soak Data (coils)

. . . . . . . . . . . . . . . . . . . . . .

57

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