Modbus protocol specification, 8 modbus protocol specification, 1 commands supported by the module – ProSoft Technology MVI56E-MCM/MCMXT User Manual
Page 160

Reference
MVI56E-MCM ♦ ControlLogix Platform
User Manual
Modbus Communication Module
Page 160 of 199
ProSoft Technology, Inc.
June 18, 2014
Tag Name
Data Type
Description
P2Slaves
INT[256]
P2 Slave Status
Passthru
Tag Name
Data Type
Description
MBOffset
INT
MBOffsetBit
INT
MBMsgLen
INT
MBMsg
SINT[500]
MBControl1
MCMCONTROL
(page 158)
MBControl2
MCMCONTROL
(page 158)
MBScratch
INT[3]
MBCoil
CoilArray (page
160)
Conversion from Bool to INT data types
CoilArray
Conversion to INT values
Name
Data Type
Description
Boolean
BOOL[416]
Conversion from Bool to INT data types
6.8
Modbus Protocol Specification
The following pages give additional reference information regarding the Modbus
protocol commands supported by the MVI56E-MCM.
6.8.1 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