Modbus Protocol Specification; Commands Supported By The Module - ProSoft MVI56E-MCMR User Manual

MVI56E-MCMR ♦ ControlLogix Platform
Modbus Communication Module with Reduced Data Block
6.6

Modbus Protocol Specification

The following pages give additional reference information regarding the Modbus
protocol commands supported by the MVI56E-MCMR.

6.6.1 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 Definition
Code
1 Read Coil Status
2 Read Input Status
3 Read Holding Registers
4 Read Input Registers
5 Set Single Coil
6 Single Register Write
8 Diagnostics
15 Multiple Coil Write
16 Multiple Register Write
17 Report Slave ID
22 Mask Write 4X
23 Read/Write
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.
ProSoft Technology, Inc.
Supported in Supported in
Master Slave
X X
X X
X X
X X
X X
X X
X
X X
X X
X
X
X
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Reference
User Manual