ProSoft Technology MVI56E-MCMXT User Manual

Reference MVI56E-MCM ♦ ControlLogix Platform
User Manual Modbus Communication Module
Page 168 of 209 ProSoft Technology, Inc.
6.7.6 MCMUTIL
This object contains optional elements for the module.
Name
Data Type
Description
BPLastRead
INT
Index of last read block
BPLastWrite
INT
Index of last write block
BlockIndex
INT
Computed block offset for data table
ReadDataSize
DINT
Size of Read Data Array
MaxReadBlock
DINT
Maximum read block
WriteDataSize
DINT
Size of Write Data Array
MaxWriteBlock
DINT
Maximum write block
RBTSremainder
INT
Contains remainder from Read Data array size
divided by the block size
WBTSremainder
INT
Contains remainder from Write Data array size
divided by the block size
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
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.

ProSoft Technology MVI56E-MCMXT Specifications

General

Brand	ProSoft Technology
Model	MVI56E-MCMXT
Category	Control Unit
Language	English