ProSoft Technology MVI56E-MCM User manual

MVI56E-MCM
ControlLogix Platform
Modbus Communication Module
July 12, 2019
USER MANUAL

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© 2019 ProSoft Technology, Inc. All rights reserved.
MVI56E-MCM User Manual
July 12, 2019
ProSoft Technology®, is a registered copyright of ProSoft Technology, Inc. All other brand or product names are or
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Content Disclaimer
This documentation is not intended as a substitute for and is not to be used for determining suitability or reliability of
these products for specific user applications. It is the duty of any such user or integrator to perform the appropriate
and complete risk analysis, evaluation and testing of the products with respect to the relevant specific application or
use thereof. Neither ProSoft Technology nor any of its affiliates or subsidiaries shall be responsible or liable for
misuse of the information contained herein. Information in this document including illustrations, specifications and
dimensions may contain technical inaccuracies or typographical errors. ProSoft Technology makes no warranty or
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in this publication, please notify us.
No part of this document may be reproduced in any form or by any means, electronic or mechanical, including
photocopying, without express written permission of ProSoft Technology. All pertinent state, regional, and local safety
regulations must be observed when installing and using this product. For reasons of safety and to help ensure
compliance with documented system data, only the manufacturer should perform repairs to components. When
devices are used for applications with technical safety requirements, the relevant instructions must be followed.
Failure to use ProSoft Technology software or approved software with our hardware products may result in injury,
harm, or improper operating results. Failure to observe this information can result in injury or equipment damage.
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If you wish to discard electrical and electronic equipment (EEE), please contact your dealer or supplier
for further information.
Warning –Cancer and Reproductive Harm –www.P65Warnings.ca.gov
Agency Approvals and Certifications
Please visit our website: www.prosoft-technology.com

Important Safety Information
North America Warnings
A Warning - Explosion Hazard - Substitution of components may impair suitability for Class I, Division 2.
B Warning - Explosion Hazard - When in Hazardous Locations, turn off power before replacing or rewiring
modules.
C Warning - Explosion Hazard - Do not disconnect equipment unless power has been switched off or the area is
known to be nonhazardous.
D Class 2 Power
ATEX Warnings and Conditions of Safe Usage:
Power, Input, and Output (I/O) wiring must be in accordance with the authority having jurisdiction
A Warning - Explosion Hazard - When in hazardous locations, turn off power before replacing or wiring modules.
B Warning - Explosion Hazard - Do not disconnect equipment unless power has been switched off or the area is
known to be non-hazardous.
C These products are intended to be mounted in an IP54 enclosure. The devices shall provide external means to
prevent the rated voltage being exceeded by transient disturbances of more than 40%. This device must be used
only with ATEX certified backplanes.
D DO NOT OPEN WHEN ENERGIZED.
<Ex>
II 3 G
Ex nA T5
0°C <= Ta <= 60°C
-25°C <= Ta <= 70°C (XT models only)
II –Equipment intended for above ground use (not for use in mines).
3 –Category 3 equipment, investigated for normal operation only.
G –Equipment protected against explosive gasses.
<cULus>
E183151
Class I, DIV 2, groups A,B,C,D
T5 for all models
0°C to +60°C
-25°C to +70°C (XT models only)
Battery Life Advisory
Note: Modules manufactured after April 1st, 2011 do not contain a battery. For modules manufactured before that
date the following applies:
The module uses a rechargeable Lithium Vanadium Pentoxide battery to back up the real-time clock and CMOS
settings. The battery itself should last for the life of the module. However, if left in an unpowered state for 14 to 21
days, the battery may become fully discharged and require recharging by being placed in a powered-up ControlLogix
chassis. The time required to fully recharge the battery may be as long as 24 hours.
Once it is fully charged, the battery provides backup power for the CMOS setup and the real-time clock for
approximately 21 days. Before you remove a module from its power source, ensure that the battery within the module
is fully charged (the BATT LED on the front of the module goes OFF when the battery is fully charged). If the battery
is allowed to become fully discharged, the module will revert to the default BIOS and clock settings.
Note: The battery is not user-replaceable or serviceable.

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Modbus Communication Module User Manual
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Contents
Your Feedback Please........................................................................................................................2
Content Disclaimer..............................................................................................................................2
Important Safety Information...............................................................................................................3
Battery Life Advisory...........................................................................................................................3
1Start Here 9
1.1 System Requirements...............................................................................................9
1.2 Deployment Checklist..............................................................................................10
1.3 Package Contents...................................................................................................12
1.4 Setting Jumpers ......................................................................................................12
1.5 Installing the Module in the Rack ............................................................................13
1.6 Creating a New RSLogix 5000 Project....................................................................15
1.6.1 Before You Import the Add-On Instruction..............................................................16
1.6.2 Creating the Module................................................................................................17
1.6.3 Import the Ladder Rung ..........................................................................................20
1.6.4 Adding Multiple Modules (Optional) ........................................................................23
1.6.5 Adjust the Input and Output Array Sizes (Optional)................................................28
1.7 Connecting Your PC to the ControlLogix Processor...............................................30
1.8 Downloading the Sample Program to the Processor..............................................31
1.8.1 Configuring the RSLinx Driver for the PC COM Port ..............................................32
2Configuration as a Modbus Master 35
2.1 Overview..................................................................................................................35
2.2 ModDef Settings......................................................................................................36
2.2.1 Port Configuration ...................................................................................................37
2.2.2 Master Command Configuration .............................................................................39
2.2.3 Other Modbus Addressing Schemes ......................................................................42
2.3 Master Command Examples...................................................................................44
2.3.1 Read Holding Registers 4x (Modbus Function Code 3)..........................................44
2.3.2 Read Input Registers 3x (Modbus Function Code 4)..............................................44
2.3.3 Read Coil Status 0x (Modbus Function Code 1).....................................................45
2.3.4 Read Input Status 1x (Modbus Function Code 2)...................................................46
2.3.5 Force (Write) Single Coil 0x (Modbus Function Code 5) ........................................46
2.3.6 Force (Write) Multiple Coils 0x (Modbus Function Code 15)..................................47
2.3.7 Preset (Write) Single Register 4x (Modbus Function Code 6)................................48
2.3.8 Preset (Write) Multiple Registers 4x (Modbus Function Code 16)..........................48
2.4 Floating-Point Data Handling (Modbus Master)......................................................49
2.4.1 Read Floating-Point Data........................................................................................49
2.4.2 Read Multiple Floating-Point Registers...................................................................51
2.4.3 Write Floats to Slave Device...................................................................................52
2.4.4 Read Floats with Single Modbus Register Address (Enron/Daniel Float) ..............53
2.4.5 Write to Enron/Daniel Floats ...................................................................................54
2.5 Command Control and Event Command................................................................55
2.5.1 Command Control...................................................................................................56
2.5.2 Event Command......................................................................................................57

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User Manual Modbus Communication Module
Page 6 of 209 ProSoft Technology, Inc.
3Configuration as a Modbus Slave 59
3.1 Overview................................................................................................................. 59
3.2 ModDef Settings ..................................................................................................... 60
3.2.1 Modbus Memory Map............................................................................................. 61
3.2.2 Customizing the Memory Map................................................................................ 63
3.3 Slave Configuration ................................................................................................ 65
3.4 Floating-Point Data Handling (Modbus Slave) ....................................................... 65
3.4.1 Enron/Daniel Float Configuration............................................................................ 66
3.5 Read and Write Same Modbus Address (Pass Through) ...................................... 68
4Verify Communication 69
4.1 Verifying Master Communications.......................................................................... 69
4.1.1 MVI56E-MCM Status Data Definition as a Master ................................................. 70
4.1.2 Command Error Codes........................................................................................... 71
4.1.3 MCM Status Data ................................................................................................... 75
4.2 Verify Slave Communications................................................................................. 76
4.2.1 MVI56E-MCM Status Data Definition as a Slave ................................................... 76
5Diagnostics and Troubleshooting 79
5.1 Ethernet LED Indicators.......................................................................................... 79
5.1.1 Scrolling LED Status Indicators.............................................................................. 80
5.1.2 Non-Scrolling LED Status Indicators ...................................................................... 81
5.2 Clearing a Fault Condition ...................................................................................... 81
5.3 Troubleshooting the LEDs...................................................................................... 82
5.4 Setting Up ProSoft Configuration Builder ............................................................... 83
5.4.1 Installing ProSoft Configuration Builder.................................................................. 83
5.4.2 Setting Up the Project............................................................................................. 84
5.4.3 Assigning an IP Address in the Project .................................................................. 85
5.5 Connecting Your PC to the Module........................................................................ 87
5.5.1 Download the IP Address through CIPconnect ...................................................... 87
5.5.2 Using RSWho to Connect to the Module................................................................ 98
5.5.3 Connecting Your PC to the Module's Ethernet Port ............................................... 99
5.6 Downloading the Project to the Module................................................................ 103
5.7 Using the Diagnostics Menu in ProSoft Configuration Builder ............................. 104
5.7.1 The Diagnostics Menu.......................................................................................... 108
5.7.2 Monitoring Backplane Information........................................................................ 108
5.7.3 Monitoring Database Information.......................................................................... 109
5.7.4 Monitoring General Information............................................................................ 110
5.7.5 Monitoring Modbus Port Information .................................................................... 111
5.7.6 Data Analyzer ....................................................................................................... 112
5.8 Reading Status Data from the Module ................................................................. 116
5.8.1 Viewing the Error Status Table............................................................................. 116
5.9 Configuration Error Codes.................................................................................... 117
5.10 Connect to the Module’s Web Page ..................................................................... 119
6Reference 121
6.1 Product Specifications .......................................................................................... 121
6.1.1 General Specifications.......................................................................................... 122
6.1.2 General Specifications - Modbus Master/Slave.................................................... 122
6.1.3 Functional Specifications...................................................................................... 122

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6.1.4 Hardware Specifications........................................................................................123
6.2 Functional Overview..............................................................................................124
6.2.1 About the Modbus Protocol...................................................................................124
6.2.2 Backplane Data Transfer.......................................................................................124
6.2.3 Normal Data Transfer............................................................................................126
6.2.4 Special Function Blocks........................................................................................128
6.2.5 Data Flow Between MVI56E-MCM Module and ControlLogix Processor.............141
6.3 Cable Connections................................................................................................144
6.3.1 Ethernet Cable Specifications...............................................................................144
6.3.2 Ethernet Cable Configuration................................................................................145
6.3.3 Ethernet Performance...........................................................................................145
6.3.4 RS-232 Application Port(s)....................................................................................146
6.3.5 RS-422 ..................................................................................................................148
6.3.6 RS-485 Application Port(s)....................................................................................148
6.3.7 DB9 to RJ45 Adaptor (Cable 14) ..........................................................................149
6.4 MVI56E-MCM Database Definition .......................................................................150
6.5 MVI56E-MCM Configuration Data.........................................................................151
6.5.1 Backplane Setup ...................................................................................................151
6.5.2 Port 1 Setup ..........................................................................................................152
6.5.3 Port 2 Setup ..........................................................................................................155
6.5.4 Port 1 Commands .................................................................................................157
6.5.5 Port 2 Commands .................................................................................................158
6.5.6 Misc. Status...........................................................................................................158
6.5.7 Command Control.................................................................................................160
6.6 MVI56E-MCM Status Data Definition....................................................................160
6.7 MVI56E-MCM User Defined Data Types..............................................................161
6.7.1 MCMModuleDef ....................................................................................................161
6.7.2 MCMCONFIG........................................................................................................162
6.7.3 MCMDATA ............................................................................................................164
6.7.4 MCMSTATUS........................................................................................................164
6.7.5 MCMCONTROL ....................................................................................................166
6.7.6 MCMUTIL..............................................................................................................168
6.8 Modbus Protocol Specification..............................................................................168
6.8.1 Commands Supported by the Module...................................................................168
6.8.2 Read Coil Status (Function Code 01) ...................................................................169
6.8.3 Read Input Status (Function Code 02)..................................................................170
6.8.4 Read Holding Registers (Function Code 03) ........................................................171
6.8.5 Read Input Registers (Function Code 04).............................................................172
6.8.6 Force Single Coil (Function Code 05)...................................................................173
6.8.7 Preset Single Register (Function Code 06)...........................................................174
6.8.8 Diagnostics (Function Code 08)............................................................................174
6.8.9 Force Multiple Coils (Function Code 15)...............................................................176
6.8.10 Preset Multiple Registers (Function Code 16) ......................................................177
6.8.11 Modbus Exception Responses..............................................................................178
6.9 Using the Optional Add-On Instruction..................................................................180
6.9.1 Before You Begin ..................................................................................................180
6.9.2 Overview................................................................................................................180
6.9.3 Importing the Utility Add-On Instruction ................................................................181
6.9.4 Reading the Ethernet Settings from the Module...................................................184
6.9.5 Writing the Ethernet Settings to the Module..........................................................186
6.9.6 Reading the Clock Value from the Module............................................................187
6.9.7 Writing the Clock Value to the Module..................................................................188
6.10 Using the Sample Program - RSLogix 5000 Version 15 and earlier.....................189
6.10.1 Using the Sample Program in a New Application .................................................189
6.10.2 Using the Sample Program in an Existing Application..........................................195

Contents MVI56E-MCM ♦ ControlLogix Platform
User Manual Modbus Communication Module
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7Support, Service & Warranty 203
7.1 Contacting Technical Support............................................................................... 203
7.2 Warranty Information ............................................................................................ 205
Index 207

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1 Start Here
In This Chapter
System Requirements.............................................................................9
Deployment Checklist............................................................................10
Package Contents.................................................................................12
Setting Jumpers ....................................................................................12
Installing the Module in the Rack...........................................................13
Creating a New RSLogix 5000 Project..................................................15
Connecting Your PC to the ControlLogix Processor..............................30
Downloading the Sample Program to the Processor.............................31
To get the most benefit from this User Manual, you should have the following
skills:
Rockwell Automation®RSLogix™ software: launch the program, configure
ladder logic, and transfer the ladder logic to the processor
Microsoft Windows®:install and launch programs, execute menu
commands, navigate dialog boxes, and enter data
Hardware installation and wiring: install the module, and safely connect
Modbus and ControlLogix devices to a power source and to the MVI56E-
MCM module’s application port(s)
1.1 System Requirements
The MVI56E-MCM module requires the following minimum hardware and
software components:
Rockwell Automation ControlLogix®processor (firmware version 10 or higher)
with compatible limited voltage power supply and one free slot in the rack for
the MVI56E-MCM module. The module requires 800mA of available 5 VDC
and 3 mA of available 24 VDC power.
Rockwell Automation RSLogix 5000 programming software
oVersion 16 or higher required for Add-On Instruction
oVersion 15 or lower must use Sample Ladder, available from
www.prosoft-technology.com
Rockwell Automation RSLinx®communication software version 2.51 or higher
ProSoft Configuration Builder (PCB) (included)

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Pentium®II 450 MHz minimum. Pentium III 733 MHz (or better)
recommended
Supported operating systems:
oMicrosoft Windows 10
oMicrosoft Windows 7 Professional (32-or 64-bit)
oMicrosoft Windows XP Professional with Service Pack 1 or 2
oMicrosoft Windows Vista
oMicrosoft Windows 2000 Professional with Service Pack 1, 2, or 3
oMicrosoft Windows Server 2003
128 Mbytes of RAM minimum, 256 Mbytes of RAM recommended
100 Mbytes of free hard disk space (or more based on application
requirements)
256-color VGA graphics adapter, 800 x 600 minimum resolution (True Color
1024 768 recommended)
Note: The Hardware and Operating System requirements in this list are the minimum
recommended to install and run software provided by ProSoft Technology®. Other third party
applications may have different minimum requirements. Refer to the documentation for any third
party applications for system requirements.
Note: You can install the module in a local or remote rack. For remote rack installation, the module
requires EtherNet/IP or ControlNet communication with the processor.
1.2 Deployment Checklist
Before you begin configuring the module, consider the following questions. Your
answers will help you determine the scope of your project, and the configuration
requirements for a successful deployment.
1 ____________ Are you creating a new application or integrating the module
into an existing application?
Most applications can use the Sample Add-On Instruction or Sample Ladder
Logic without any edits to the Sample Program.
2 ____________ Which slot number in the chassis will the MVI56E-MCM
module occupy?
For communication to occur, you must enter the correct slot number in the
sample program.
3 ____________ Are RSLogix 5000 and RSLinx software installed?
RSLogix and RSLinx are required to communicate to the ControlLogix
processor (1756-L1, L55, L61 & L63). Sample Ladder programs are available
for different versions of RSLogix 5000.

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4 ____________ How many words of data do you need to transfer in your
application (from ControlLogix to Module / to ControlLogix from Module)?
The MVI56E-MCM module can transfer a maximum of 10,000 (16-bit)
registers to and from the ControlLogix processor. The Sample Ladder
transfers 600 words to the ControlLogix processor (into the Read Data array),
and obtains 600 words from the ControlLogix processor (from the Write Data
array)
5 ____________ Will you be using the module as a Modbus Master or Modbus
Slave? Will you be transferring data using Modbus RTU or Modbus ASCII?
Modbus is a Master/Slave network. Only one Master is allowed on the serial
communications line (max 32 devices/RS485). The Master is responsible for
polling data from the Slaves on the network.
6 ____________ For a Modbus Master, what Slave Device Addresses and
Modbus Data Addresses do you need to exchange data with on the Modbus
network?
For a Modbus Master, you must know the Slave Device Address number of
each Slave device to poll. You also need the Modbus address (for example,
coil 00001, register 40001) of the data to read from or write to each Slave
device.
7 ____________ For a Modbus Slave, how many words or bits of data do you
need to send to the Master device?
The MVI56E-MCM module can send data to a Modbus Master as 0x coil
data, 1x input coil data, 3x input registers, and 4x holding registers. The
sample program transfers 600 (16-bit) words or 9600 bits to the ControlLogix
processor, and 600 (16-bit) words or 9600 bits from the ControlLogix
processor.
8 Serial Communication Parameters for the Modbus network:
____________ Baud rate?
____________ Data bits?
____________ Parity?
____________ Stop bits?
Required for both Master and Slave configurations.
9 ____________ Wiring type to use (RS232, 422 or 485). Configured by
Setting Jumpers.
Required for proper implementation of the module in Master and Slave
configurations.
Note: If you are using RSLogix 5000 version 16 or newer, refer to Before You Import the Add-On
Instruction (page 16).
For RSLogix 5000 version 15 and earlier, refer to Using the Sample Program - RSLogix 5000
Version 15 and earlier (page 189).
Most applications can use the Sample Ladder Logic without modification.

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1.3 Package Contents
The following components are included with your MVI56E-MCM module, and are
all required for installation and configuration.
Important: Before beginning the installation, please verify that all of the following items are
present.
Qty.
Part Name
Part Number
Part Description
1
MVI56E-MCM Module
MVI56E-MCM
Modbus Communication Module
2
Cable
Cable #14, RJ45 to
DB9 Male Adapter
cable
For DB9 Connection to Module’s
Application Serial Port
2
Adapter
1454-9F
Two Adapters, DB9 Female to Screw
Terminal. For RS422 or RS485
Connections to Port 1 and 2 of the Module
If any of these components are missing, please contact ProSoft Technology
Support for replacement parts.
1.4 Setting Jumpers
There are three jumpers located at the bottom of the module. The first two
jumpers (P1 and P2) set the serial communication mode: RS-232, RS-422 or RS-
485.
The following illustration shows the MVI56E-MCM jumper configuration, with the
Setup Jumper OFF.
The Setup Jumper acts as "write protection" for the module’s firmware. In "write
protected" mode, the Setup pins are not connected, and the module’s firmware
cannot be overwritten. The module is shipped with the Setup jumper OFF. Do not
jumper the Setup pins together unless you are directed to do so by ProSoft
Technical Support (or you want to update the module firmware).
The following illustration shows the jumper configuration with the Setup Jumper
OFF.

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Note: If you are installing the module in a remote rack, you may prefer to leave the Setup pins
jumpered. That way, you can update the module’s firmware without requiring physical access to
the module.
Security considerations:
Leaving the Setup pin jumpered leaves the module open to unexpected firmware updates.
You should consider segmenting the data flow for security reasons. Per IEC 62443-1-1, you should
align with IEC 62443 and implement segmentation of the control system. Relevant capabilities are
firewalls, unidirectional communication, DMZ. Oil and Gas customers should also see DNVGL-RP-
G108 for guidance on partitioning.
You should practice security by design, per IEC 62443-4-1, including layers of security and
detection. The module relies on overall network security design, as it is only one component of
what should be a defined zone or subnet.
1.5 Installing the Module in the Rack
Make sure your ControlLogix processor and power supply are installed and
configured, before installing the MVI56E-MCM module. Refer to your Rockwell
Automation product documentation for installation instructions.
Warning: You must follow all safety instructions when installing this or any other electronic
devices. Failure to follow safety procedures could result in damage to hardware or data, or even
serious injury or death to personnel. Refer to the documentation for each device you plan to
connect to verify that suitable safety procedures are in place before installing or servicing the
device.
After you have checked the placement of the jumpers, insert the MVI56E-MCM
into the ControlLogix chassis. Use the same technique recommended by
Rockwell Automation to remove and install ControlLogix modules.
You can install or remove ControlLogix system components while chassis power
is applied and the system is operating. However, please note the following
warning.
Warning: When you insert or remove the module while backplane power is on, an electrical arc
can occur. An electrical arc can cause personal injury or property damage by sending an
erroneous signal to the system’s actuators. This can cause unintended machine motion or loss of
process control. Electrical arcs may also cause an explosion when they happen in a hazardous
environment. Verify that power is removed or the area is non-hazardous before proceeding.
Repeated electrical arcing causes excessive wear to contacts on both the module and its mating
connector. Worn contacts may create electrical resistance that can affect module operation.

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1 Align the module with the top and bottom guides, and then slide it into the
rack until the module is firmly against the backplane connector.
2 With a firm, steady push, snap the module into place.
3 Check that the holding clips on the top and bottom of the module are securely
in the locking holes of the rack.
4 Make a note of the slot location. You must identify the slot in which the
module is installed in order for the sample program to work correctly. Slot
numbers are identified on the green circuit board (backplane) of the
ControlLogix rack.
5 Turn power ON.
Note: If you insert the module improperly, the system may stop working or may behave
unpredictably.
Note: When using the MVI56E-MCMXT, you must use the 1756-A5XT or 1756-A7LXT chassis. In
these chassis, modules are spaced further apart than in standard ControlLogix chassis. Blank
spacers are inserted between active modules.

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1.6 Creating a New RSLogix 5000 Project
1 Open the FILE menu, and then choose NEW.
2 Select your ControlLogix controller model.
3 Select the REVISION of your controller. Depending on the revision, there may
be some small differences in the appearance of dialog boxes from the ones
shown in this Guide.
4 Enter a name for your controller, such as My_Controller.
5 Select your ControlLogix chassis type.
6 Select SLOT 0for the controller.
7 Click OK

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1.6.1 Before You Import the Add-On Instruction
Note: This section only applies if your processor is using RSLogix 5000 version 16 or higher. If you
have an earlier version, please see Using the Sample Program - RSLogix 5000 Version 15 and
earlier (page 189).
Two Add-On Instructions are provided for the MVI56E-MCM module. The first is
required for setting up the module; the second is optional.
Download them from www.prosoft-technology.com. Save them to a convenient
location in your PC, such as Desktop or My Documents.
File Name
Description
MVI56EMCM_AddOn_Rung_v2_8.L5X. A
newer version may be available at
www.prosoft-technology.com
L5X file containing Add-On Instruction, user defined
data types, controller tags and ladder logic required
to configure the MVI56E-MCM module
MVI56(E)MCM_Optional_AddOn_Rung_v1_2
.L5X. A newer version may be available at
www.prosoft-technology.com
Optional L5X file containing additional Add-On
Instruction with logic for changing Ethernet
configuration and clock settings.
About the Optional Add-On Instruction
The Optional Add-On Instruction performs the following tasks:
Read/Write Ethernet Configuration
Allows the processor to read or write the module IP address, subnet mask,
and network gateway IP address.
Read/Write Module Clock Value
Allows the processor to read and write the module clock settings. The
module's free-running clock also stores the last time that the Ethernet
configuration was changed or the last time the module was restarted or
rebooted. The date and time of the last change or restart is displayed on the
scrolling LED during module power-up/start-up sequence.
For more information, see Using the Optional Add-On Instruction (page 180).
Note: You can also set the date and time from the module's Connect to the Module’s Web Page
(page 118).
Important: The Optional Add-On Instruction supports only the two features listed above. You must
use the regular MVI56E-MCM Add-On Instruction for all other features including backplane transfer
and Modbus data communication.

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1.6.2 Creating the Module
1 Add the MVI56E-MCM module to the project.
In the CONTROLLER ORGANIZATION window, select I/O CONFIGURATION and
click the right mouse button to open a shortcut menu. On the shortcut menu,
choose NEW MODULE...
This action opens the SELECT MODULE dialog box. Enter generic in the text
box and select the GENERIC 1756 MODULE. If you're using a controller
revision of 15 or less, expand OTHER in the SELECT MODULE dialog box,
and then select the GENERIC 1756 MODULE.

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2 Click CREATE.This action opens the NEW MODULE dialog box.
3 In the NEW MODULE dialog box, enter the following values.
Parameter
Value
NAME
MCM
DESCRIPTION
Enter a description for the module. Example: Modbus
Communication Module
COMM FORMAT
Select DATA-INT
SLOT
Enter the slot number in the rack where the MVI56E-MCM
module is located
INPUT ASSEMBLY INSTANCE
1
INPUT SIZE
250
OUTPUT ASSEMBLY INSTANCE
2
OUTPUT SIZE
248
CONFIGURATION ASSEMBLY INSTANCE
4
CONFIGURATION SIZE
0
Important: You must select the COMM FORMAT as DATA -INT in the dialog box, otherwise the
module will not communicate over the backplane of the ControlLogix rack.
4 Click OK to continue.
5 Edit the Module Properties.

MVI56E-MCM ♦ ControlLogix Platform Start Here
Modbus Communication Module User Manual
ProSoft Technology, Inc. Page 19 of 209
Select the REQUESTED PACKET INTERVAl value for scanning the I/O on the
module. This value represents the minimum frequency at which the module
will handle scheduled events. This value should not be set to less than 1
millisecond. The default value is 5 milliseconds. Values between 1 and 10
milliseconds should work with most applications.
6 Click OK to save the module and close the dialog box. Notice that the module
now appears in the CONTROLLER ORGANIZATION window.

Start Here MVI56E-MCM ♦ ControlLogix Platform
User Manual Modbus Communication Module
Page 20 of 209 ProSoft Technology, Inc.
1.6.3 Import the Ladder Rung
1 In the CONTROLLER ORGANIZATION window, expand the TASKS folder and
subfolders until you reach the MAINPROGRAM folder.
2 In the MAINPROGRAM folder, double-click to open the MAINROUTINE ladder.
3 Select an empty rung in the routine, and then click the right mouse button to
open a shortcut menu. On the shortcut menu, choose IMPORT RUNGS…
4 Navigate to the location on your PC where you Before You Begin (page 16)
the Add-On Instruction (for example, My Documents or Desktop). Select the
MVI56EMCM_ADDON_RUNG_V2.8.L5X file.