Prosoft-technology MVI46-MCM Manual de usuario descargar pdf (Pagina 83)

MVI46-MCM ♦ SLC Platform Reference

Modbus Communication Module User Manual

ProSoft Technology, Inc. Page 83 of 108

March 29, 2011

5.6 Modbus Protocol Specification

The following pages give additional reference information regarding the Modbus

protocol commands supported by the MVI46-MCM.

5.6.1 Commands Supported by the Module

The format of each command in the list depends on the MODBUS Function Code

being executed.

The following table lists the functions supported by the module.

Function

Code

Definition

Supported in

Master

Supported in

Slave

1 Read Coil Status X X

2 Read Input Status X X

3 Read Holding Registers X X

4 Read Input Registers X X

5 Set Single Coil X X

6 Single Register Write X X

8 Diagnostics X

15 Multiple Coil Write X X

16 Multiple Register Write X X

17 Report Slave ID X

22 Mask Write 4X X

23 Read/Write X

Each command list record has the same general format. The first part of the

record contains the information relating to the communication module and the

second part contains information required to interface to the MODBUS slave

device.

1 2 ... 78 79 80 81 82 83 84 85 86 87 88 ... 107 108

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Prosoft-technology MVI46-MCM Manual de usuario Pagina 83