ProSoft Technology MVI46-MCM User Manual

MVI46-MCM

SLC Platform

Modbus Communication Module

March 29, 2011

USER MANUAL

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ProSoft Technology

5201 Truxtun Ave., 3rd Floor Bakersfield, CA 93309 +1 (661) 716-5100 +1 (661) 716-5101 (Fax) www.prosoft-technology.com support@prosoft-technology.com

MVI46-MCM User Manual

March 29, 2011

ProSoft Technology ®, ProLinx ®, inRAx ®, ProTalk ®, and RadioLinx ® are Registered Trademarks of ProSoft Technology, Inc. All other brand or product names are or may be trademarks of, and are used to identify products and services of, their respective owners.

ProSoft Technology® Product Documentation

In an effort to conserve paper, ProSoft Technology no longer includes printed manuals with our product shipments. User Manuals, Datasheets, Sample Ladder Files, and Configuration Files are provide d on the enclosed CD-ROM, and are available at no charge from our web site: www.prosoft-technology.com

Important Installation Instructions

Power, Input, and Output (I/O) wiring must be in accordance with Class I, Division 2 wiring methods, Article 501-4 (b) of the National Electrical Code, NFPA 70 for installation in the U.S., or as specified in Section 18-1J2 of the Canadian Electrical Code for installations in Canada, and in accordance with the authority having jurisdiction. The following warnings must be heeded:

A WARNING - EXPLOSION HAZARD - SUBSTITUTION OF COMPONENTS MAY IMPAIR SUITABILITY FOR

CLASS I, DIV. 2;

B WARNING - EXPLOSION HAZARD - WHEN IN HAZARDOUS LOCATIONS, TURN OFF POWER BEFORE

REPLACING OR WIRING MODULES

C WARNING - EXPLOSION HAZARD - DO NOT DISCONNECT EQUIPMENT UNLESS POWER HAS BEEN

SWITCHED OFF OR THE AREA IS KNOWN TO BE NON-HAZARDOUS.

D THIS DEVICE SHALL BE POWERED BY CLASS 2 OUTPUTS ONLY.

MVI (Multi Vendor Interface) Modules

WARNING - EXPLOSION HAZARD - DO NOT DISCONNECT EQUIPMENT UNLESS POWER HAS BEEN SWITCHED OFF OR THE AREA IS KNOWN TO BE NON-HAZARDOUS.

AVERTISSEMENT - RISQUE D'EXPLOSION - AVANT DE DÉCONNECTER L'ÉQUIPEMENT, COUPER LE COURANT OU S'ASSURER QUE L'EMPLACEMENT EST DÉSIGNÉ NON DANGEREUX.

Warnings

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. Warning - Explosion Hazard - Do not disconnect equipment unless power has been switched off or the area is known to be nonhazardous.

C Suitable for use in Class I, division 2 Groups A, B, C and D Hazardous Locations or Non-Hazardous Locations.

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.

Warning: This module is not hot-swappable! Always remove power from the rack before inserting or removing this

module, or damage may result to the module, the processor, or other connected devices.

Battery Life Advisory

The MVI46, MVI56, MVI56E, MVI69, and MVI71 modules use a rechargeable Lithium Vanadium Pentoxide battery to backup the real-time clock and CMOS. The battery should last for the life of the module. The module must be powered for approximately twenty hours before the battery becomes fully charged. After it is fully charged, the battery provides backup power for the CMOS setup and the real-time clock for approximately 21 days. When the battery is fully discharged, the module will revert to the default BIOS and clock settings.

Note: The battery is not user replaceable.

Markings

Electrical Ratings

 Backplane Current Load: 800 mA @ 5 Vdc  Operating Temperature: 0°C to 60°C (32°F to 140°F)  Storage Temperature: -40°C to 85°C (-40°F to 185°F)  Shock: 30g Operational; 50g non-operational; Vibration: 5 g from 10 Hz to 150 Hz  Relative Humidity 5% to 95% (without condensation)  All phase conductor sizes must be at least 1.3 mm(squared) and all earth ground conductors must be at least

4mm(squared).

Label Markings Agency Approvals and Certifications

Agency Applicable Standards

ANSI / ISA ISA 12.12.01 Class I Division 2, GPs A, B, C, D CSA/cUL C22.2 No. 213-1987 CSA CB Certified IEC61010 ATEX EN60079-0 Category 3, Zone 2

EN60079-15

243333

MVI46-MCM ♦ SLC Platform Contents Modbus Communication Module User Manual

Contents

Your Feedback Please ........................................................................................................................ 2

How to Contact Us .............................................................................................................................. 2

ProSoft Technology® Product Documentation .................................................................................... 2

Important Installation Instructions ....................................................................................................... 3

MVI (Multi Vendor Interface) Modules ................................................................................................ 3

Warnings ............................................................................................................................................. 3

Battery Life Advisory ........................................................................................................................... 4

Markings .............................................................................................................................................. 4

Guide to the MVI46-MCM User Manual 9

1 Start Here 11

1.1 System Requirements ............................................................................................. 12

1.2 Package Contents ................................................................................................... 13

1.3 Setting Jumpers ...................................................................................................... 14

1.4 Installing the Module in the Rack ............................................................................ 15

1.5 Connecting Your PC to the Module ......................................................................... 16

2 Configuring the MVI46-MCM Module 17

2.1 Configuration Data .................................................................................................. 17

3 Ladder Logic 27

3.1 Module Data ............................................................................................................ 28

3.1.1 Backplane Parameters ............................................................................................ 28

3.1.2 Port Parameters ...................................................................................................... 28

3.1.3 Master Commands .................................................................................................. 29

3.1.4 Status Data .............................................................................................................. 29

3.1.5 User Data ................................................................................................................ 30

3.1.6 Slave Polling Control and Status ............................................................................. 30

3.2 Adding the Module to an Existing Project ............................................................... 31

4 Diagnostics and Troubleshooting 33

4.1 LED Status Indicators .............................................................................................. 34

4.1.1 Clearing a Fault Condition ....................................................................................... 36

4.1.2 Troubleshooting ....................................................................................................... 36

4.2 The Configuration/Debug Menu .............................................................................. 37

4.2.1 Using the Configuration/Debug Port ....................................................................... 37

4.2.2 Main Menu ............................................................................................................... 39

4.2.3 Data Analyzer .......................................................................................................... 43

4.2.4 Database View Menu .............................................................................................. 48

4.2.5 Master Command Error List Menu .......................................................................... 51

4.2.6 Master Command List Menu ................................................................................... 52

4.3 Reading Status Data from the Module .................................................................... 53

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Contents MVI46-MCM ♦ SLC Platform User Manual Modbus Communication Module

4.3.1 MVI46-MCM Status Data Definition ........................................................................ 53

4.3.2 Command Error Codes ........................................................................................... 55

5 Reference 57

5.1 Product Specifications ............................................................................................ 57

5.1.1 General Specifications ............................................................................................ 57

5.1.2 Hardware Specifications ......................................................................................... 58

5.1.3 General Specifications - Modbus Master/Slave ...................................................... 58

5.1.4 Functional Specifications ........................................................................................ 59

5.2 Functional Overview ............................................................................................... 60

5.2.1 About the MODBUS Protocol ................................................................................. 60

5.2.2 General Concepts ................................................................................................... 60

5.2.3 Normal Data Transfer ............................................................................................. 64

5.2.4 Special Function Blocks .......................................................................................... 64

5.2.5 Data Flow Between MVI46-MCM Module and SLC Processor .............................. 73

5.3 Cable Connections ................................................................................................. 76

5.3.1 RS-232 Configuration/Debug Port .......................................................................... 76

5.3.2 RS-232 Application Port(s) .................................................................................... 76

5.3.3 RS-422 .................................................................................................................... 79

5.3.4 RS-485 Application Port(s) ..................................................................................... 79

5.3.5 DB9 to RJ45 Adaptor (Cable 14) ............................................................................ 80

5.4 MVI46-MCM Database Definition ........................................................................... 81

5.5 MVI46-MCM Remote Configuration........................................................................ 82

5.6 Modbus Protocol Specification ............................................................................... 83

5.6.1 Commands Supported by the Module .................................................................... 83

5.6.2 Read Coil Status (Function Code 01) ..................................................................... 84

5.6.3 Read Input Status (Function Code 02) ................................................................... 85

5.6.4 Read Holding Registers (Function Code 03) .......................................................... 86

5.6.5 Read Input Registers (Function Code 04) .............................................................. 87

5.6.6 Force Single Coil (Function Code 05) .................................................................... 88

5.6.7 Preset Single Register (Function Code 06) ............................................................ 89

5.6.8 Diagnostics (Function Code 08) ............................................................................. 90

5.6.9 Force Multiple Coils (Function Code 15) ................................................................ 92

5.6.10 Preset Multiple Registers (Function Code 16) ........................................................ 93

5.6.11 Modbus Exception Responses ............................................................................... 94

6 Support, Service & Warranty 97

Contacting Technical Support .......................................................................................................... 97

6.1 Return Material Authorization (RMA) Policies and Conditions ............................... 99

6.1.1 Returning Any Product ............................................................................................ 99 

6.1.2 Returning Units Under Warranty........................................................................... 100

6.1.3 Returning Units Out of Warranty........................................................................... 100

6.2 LIMITED WARRANTY .......................................................................................... 101

6.2.1 What Is Covered By This Warranty ...................................................................... 101

6.2.2 What Is Not Covered By This Warranty ................................................................ 102

6.2.3 Disclaimer Regarding High Risk Activities ............................................................ 102

6.2.4 Intellectual Property Indemnity ............................................................................. 103

6.2.5 Disclaimer of all Other Warranties ........................................................................ 103

6.2.6 Limitation of Remedies ** ..................................................................................... 104

6.2.7 Time Limit for Bringing Suit ................................................................................... 104

6.2.8 No Other Warranties ............................................................................................. 104

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MVI46-MCM ♦ SLC Platform Contents Modbus Communication Module User Manual

6.2.9 Allocation of Risks ................................................................................................. 104

6.2.10 Controlling Law and Severability ........................................................................... 105

Index 107

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Contents MVI46-MCM ♦ SLC Platform User Manual Modbus Communication Module

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MVI46-MCM ♦ SLC Platform Guide to the MVI46-MCM User Manual Modbus Communication Module User Manual

Guide to the MVI46-MCM User Manual

Function

Introduction (Must Do)

Diagnostic and Troubleshooting

Reference

Product Specifications

Functional Overview

Support, Service, and Warranty

Index

Section to Read Details

Start Here (page 11)



Diagnostics and



Troubleshooting

Reference (page 57)



Product Specifications (page

57)

Functional Overview (page 60)

Support, Service



and Warranty (page

97)

Index

This section introduces the customer to the module. Included are: package contents, system requirements, hardware installation, and basic configuration.

This section describes Diagnostic and Troubleshooting procedures.

These sections contain general references associated with this product, Specifications, and the Functional Overview.

This section contains Support, Service and Warranty information.

Index of chapters.

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Guide to the MVI46-MCM User Manual MVI46-MCM ♦ SLC Platform User Manual Modbus Communication Module

Page 10 of 108 ProSoft Technology, Inc. March 29, 2011

MVI46-MCM ♦ SLC Platform Start Here Modbus Communication Module User Manual

1 Start Here

In This Chapter

 System Requirements ........................................................................... 12

 Package Contents ................................................................................. 13

 Setting Jumpers .................................................................................... 14

 Installing the Module in the Rack ........................................................... 15

 Connecting Your PC to the Module ....................................................... 16

To get the most benefit from this User Manual, you should have the following skills:

 Rockwell Automation

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 Master/Slave and SLC devices to a power source and to the MVI46MCM module’s application port(s)

RSLogix™ software: launch the program, configure

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Start Here MVI46-MCM ♦ SLC Platform User Manual Modbus Communication Module

1.1 System Requirements

The MVI46-MCM module requires the following minimum hardware and software components:

 Rockwell Automation SLC 5/02 M0/M1 capable processors (or newer), with

compatible power supply and one free slot in the rack, for the MVI46-MCM module. The module requires 800mA of available power.

 Rockwell Automation RSLogix 500 programming software.  Rockwell Automation RSLinx communication software  Pentium

recommended

 Supported operating systems:

o Microsoft o Windows NT o Windows 2000 o Windows XP

 32 Mbytes of RAM minimum, 64 Mbytes of RAM recommended  50 Mbytes of free hard disk space (or more based on application

requirements)

 16-color VGA graphics adapter, 640 x 480 minimum resolution (256 Color

800  600 recommended)

 CD-ROM drive  3.5 inch floppy disk drive  HyperTerminal or other terminal emulator program capable of file transfers

using Ymodem protocol.

II 500 MHz minimum. Pentium III 733 MHz (or better)

Windows 98

(version 4 with SP4 or higher)

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MVI46-MCM ♦ SLC Platform Start Here Modbus Communication Module User Manual

1.2 Package Contents

The following components are included with your MVI46-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 MVI46-MCM Module MVI46-MCM Modbus Communication Module 1 Cable

3 Cable

2 Adapter 1454-9F

1 ProSoft Solutions CD

If any of these components are missing, please contact ProSoft Technology Support for replacement parts.

Cable #15, RS232 Null Modem

Cable #14, RJ45 to DB9 Male Adapter cable

For RS232 Connection to the CFG Port

For DB9 Connection to Module’s Port

Two Adapters, DB9 Female to Screw Terminal. For RS422 or RS485 Connections to Port 1 and 2 of the Module

Contains sample programs, utilities and documentation for the MVI46-MCM module.

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Start Here MVI46-MCM ♦ SLC Platform User Manual Modbus Communication Module

1.3 Setting Jumpers

If you use an interface other than RS-232 (default), you must change the jumper configuration to match the interface. The following illustration shows the MVI46MCM jumper configuration:

The Setup Jumper acts as "write protection" for the module’s flash memory. In "write protected" mode, the Setup pins are not connected, and the module’s firmware cannot be overwritten. Do not jumper the Setup pins together unless you are directed to do so by ProSoft Technical Support.

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MVI46-MCM ♦ SLC Platform Start Here Modbus Communication Module User Manual

1.4 Installing the Module in the Rack

If you have not already installed and configured your SLC processor and power supply, please do so before installing the MVI46-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 MVI46-MCM into the SLC™ chassis. Use the same technique recommended by Rockwell Automation to remove and install SLC™ modules.

Warning: This module is not hot-swappable! Always remove power from the rack before

inserting or removing this module, or damage may result to the module, the processor, or other connected devices.

1 Turn power OFF. 2 Align the module with the top and bottom guides, and slide it into the rack

until the module is firmly against the backplane connector.

3 With a firm but steady push, snap the module into place. 4 Check that the holding clips on the top and bottom of the module are securely

in the locking holes of the rack.

5 Make a note of the slot location. You will need to 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 SLC rack.

6 Turn power ON.

Note: If you insert the module improperly, the system may stop working, or may behave

unpredictably.

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Start Here MVI46-MCM ♦ SLC Platform User Manual Modbus Communication Module

1.5 Connecting Your PC to the Module

With the module securely mounted, connect your PC to the Configuration/Debug port using an RJ45-DB-9 Serial Adapter Cable and a Null Modem Cable.

1 Attach both cables as shown. 2 Insert the RJ45 cable connector into the Configuration/Debug port of the

module.

3 Attach the other end to the serial port on your PC.

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MVI46-MCM ♦ SLC Platform Configuring the MVI46-MCM Module Modbus Communication Module User Manual

2 Configuring the MVI46-MCM Module

In order for the MVI46-MCM module to function, a minimum amount of configuration data must be transferred to the module. The following table describes the configuration data that the module will require, depending on the operating modes to be supported.

Module Register Address

5000 to 5009 Data Transfer

5010 to 5039 and 5040 to 5069

5200 to 6199 and 6200 to 7199

Functional Modes Affected

Master and Slave

Master

Name Description

General Module Configuration

Port Configuration

Master Command List

This section of the configuration data contains the module configuration data that defines the data transfer between the module and the SLC processor.

These sections define the characteristics of each of the Modbus serial communication ports on the module. These parameters must be set correctly for proper module operation.

If the module’s Master Mode functionality is to be supported on a port, the Master Command List must be set up.

Refer to the Installing and Configuring the Module section for a description of the configuration of the module. The MVI46-MCM module must be configured at least once when the card is first powered, and any time thereafter when the parameters must be changed.

2.1 Configuration Data

Configuration of the module is performed by filling in a user defined data table. In the example ladder logic, file N10 stores the general module configuration information. N11 stores the command list for port 1. N12 stores the command list for port 2. Each register in the files has an associated symbol and description to aid in filling in the data. Refer to MVI46-MCM Configuration Data for a list of items that must be configured for the module and their associated location in the M0 file.

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Configuring the MVI46-MCM Module MVI46-MCM ♦ SLC Platform User Manual Modbus Communication Module

Backplane Setup

File M0 Offset Register Content Description

N10:0 1 5000 Write Start Reg Not used in this version of the software

N10:1 2 5001 Write Reg Count Not used in this version of the software

N10:2 3 5002 Read Start Reg Not used in this version of the software

N10:3 4 5003 Read Reg Count Not used in this version of the software

N10:4 5 5004 Backplane Fail Not used in this version of the software

N10:5 6 5005 Error Status Pointer This parameter specifies the register location in the

module's database where module status data is stored. If a value less than 0 is entered, the data will not be stored in the database. If the value specified is in the range of 0 to 4940, the data is placed in the user data area.

N10:6 7 5006 Spare

N10:7 8 5007 Spare

N10:8 9 5008 Spare

N10:9 10 5009 Spare

Port 1 Setup

File M0 Offset Register Content Description

N10:10 11 5010 Enable This parameter defines if this port will be used. If

N10:11 12 5011 Type This parameter defines if the port emulates a

N10:12 13 5012 Float Flag This flag specifies if the floating-point data access

N10:13 14 5013 Float Start This parameter defines the first register of floating-

N10:14 15 5014 Float Offset This parameter defines the start register for

N10:15 16 5015 Protocol 0=RTU, 1=ASCII

the parameter is set to 0, the port is disabled. A value of 1 enables the port.

master or slave device. Enter 0 to emulate a master device and 1 to emulate a slave device.

functionality is to be used. If the float flag is set to Y, Modbus functions 3,6, and 16 will interpret floating point values for registers as specified by the two following parameters.

point data. All requests with register values greater than or equal to this value will be considered floating-point data requests. This parameter is only used if the Float Flag is enabled. For example, if a value of 7000 is entered, all requests for registers 7000 and above will be considered floating-point data.

floating-point data in the internal database. This parameter is only used if the Float Flag is enabled. For example, if the Float Offset value is set to 3000 and the float start parameter is set to 7000, data requests for register 7000 will use the internal Modbus register 3000.

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MVI46-MCM ♦ SLC Platform Configuring the MVI46-MCM Module Modbus Communication Module User Manual

File M0 Offset Register Content Description

N10:16 17 5016 Baud Rate This is the baud rate to be used on the port. Enter

the baud rate as a value. For example, to select 19K baud, enter 19200. Exceptions: 38400 baud, enter 384. 57600 enter 576. 115000 enter 115.

N10:17 18 5017 Parity This is the parity code to be used on the port. The

coded values are as follows: 0=None 1=Odd 2=Even

N10:18 19 5018 Data Bits This parameter sets the number of data bits for

each word used by the protocol. Enter a value in the range of 5 to 8.

N10:19 20 5019 Stop Bits This parameter sets the number of stop bits for

each data value sent. Enter a value of 1 or 2.

N10:20 21 5020 RTS On Delay This parameter sets the number of milliseconds to

delay after RTS is asserted before the data will be transmitted. Enter a value in the range of 0 to

65535.

N10:21 22 5021 RTS Off Delay This parameter sets the number of milliseconds to

delay after the last byte of data is sent before the RTS modem signal will be set low. Enter a value in the range of 0 to 65535.

N10:22 23 5022 Minimum Response

Delay

N10:23 24 5023 Use CTS Line This parameter specifies if the CTS modem control

N10:24 25 5024 Slave ID This parameter defines the virtual Modbus slave

N10:25 26 5025 Bit Input Offset This parameter specifies the offset address in the

N10:26 27 5026 Word Input Offset This parameter specifies the offset address in the

This parameter sets the number of milliseconds to wait before a response message is sent out of the port. This parameter is required when interfacing to a slow responding device. Enter a value in the range of 0 to 65535.

line is to be used. If the parameter is set to 0, the CTS line will not be monitored. If the parameter is set to 1, the CTS line will be monitored and must be high before the module will send data. Normally, this parameter is required when half-duplex modems are used for communication (2-wire).

address for the internal database. Any requests received by the port with this address will be processed by the module. Verify that each device has a unique address on the network.

internal Modbus database for network requests for Modbus function 2 commands. For example, if the value is set to 150, an address request of 0 will return the value at register 150 in the database.

internal Modbus database for network requests for Modbus function 4 commands. For example, if the value is set to 150, an address request of 0 will return the value at register 150 in the database.

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Configuring the MVI46-MCM Module MVI46-MCM ♦ SLC Platform User Manual Modbus Communication Module

File M0 Offset Register Content Description

N10:27 28 5027 Output Offset This parameter specifies the offset address in the

internal Modbus database for network requests for Modbus function 1, 5, or 15 commands. For example, if the value is set to 100, an address request of 0 will return the value at register 100 in the database.

N10:28 29 5028 Holding Register

Offset

N10:29 30 5029 Command Count This parameter specifies the number of commands

N10:30 31 5030 Minimum Command

Delay

N10:31 32 5031 Command Error

Pointer

N10:32 33 5032 Response Timeout This parameter represents the message response

N10:33 34 5033 Retry Count This parameter specifies the number of times a

N10:34 35 5034 Error Delay Count This parameter specifies the number of polls to be

N10:35 36 5035 Reserved

N10:36 37 5036 Use Guard Band

Timer

N10:37 38 5037 Guard Band Timeout A value of 0 uses the default baud rate or you can

N10:38 39 5038 Spare

N10:39 40 5039 Spare

This parameter specifies the offset address in the internal Modbus database for network requests for Modbus 3, 6, or 16 commands. For example, if the value is set to 50, an address request of 0 will return the value at register 50 in the database.

to be processed for the port. Enter a value of 0 to

100.

This parameter specifies the number of milliseconds to wait between the initial issuance of a command. This parameter can be used to delay all commands sent to slaves to avoid "flooding" commands on the network. This parameter does not affect retries of a command as they will be issued when failure is recognized. Enter a value in the range of 0 to 65535.

This parameter sets the address in the internal Modbus database where the command error data will be placed. If the value is set to -1, the data will not be transferred to the database. Enter a value of 0 to 4999.

timeout period in 1 ms increments. This is the time that a port configured as a master will wait before re-transmitting a command if no response is received from the addressed slave. The value is set depending on to communication network used and the expected response time of the slowest device on the network.

command will be retried if it fails. Enter a value in the range of 0 to 10.

skipped on the slave before trying to re-establish communications. After the slave fails to respond, the master will skip commands to be sent to the slave the number of times entered in the parameter. Enter a value in the range of 0 to

65535.

Use packet gap timeout for messages (Yes or No). Use only in multi-drop applications.

set a value in milliseconds (0 to 65535)

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MVI46-MCM ♦ SLC Platform Configuring the MVI46-MCM Module Modbus Communication Module User Manual

Port 2 Setup

File M0 Offset Register Content Description

N10:40 41 5040 Enable This parameter defines if this port will be used. If the

parameter is set to 0, the port is disabled. A value of 1 enables the port.

N10:41 42 5041 Type This parameter defines if the port emulates a master or

slave device. Enter 0 to emulate a master device and 1 to emulate a slave device.

N10:42 43 5042 Float Flag This flag specifies if the floating-point data access

functionality is to be used. If the float flag is set to Y, Modbus functions 3,6, and 16 will interpret floating point values for registers as specified by the two following parameters.

N10:43 44 5043 Float Start This parameter defines the first register of floating-point

data. All requests with register values greater than or equal to this value will be considered floating-point data requests. This parameter is only used if the Float Flag is enabled. For example, if a value of 7000 is entered, all requests for registers 7000 and above will be considered floating-point data.

N10:44 45 5044 Float Offset This parameter defines the start register for floating-

point data in the internal database. This parameter is only used if the Float Flag is enabled. For example, if the Float Offset value is set to 3000 and the float start parameter is set to 7000, data requests for register 7000 will use the internal Modbus register 3000.

N10:45 46 5045 Protocol 0=RTU, 1=ASCII

N10:46 47 5046 Baud Rate This is the baud rate to be used on the port. Enter the

baud rate as a value. For example, to select 19K baud, enter 19200. Exceptions: 38400 baud, enter 384. 57600 enter 576. 115000 enter 115.

N10:47 48 5047 Parity This is the parity code to be used on the port. The

coded values are as follows: 0=None 1=Odd 2=Even

N10:48 49 5048 Data Bits This parameter sets the number of data bits for each

word used by the protocol. Enter a value in the range of 5 to 8.

N10:49 50 5049 Stop Bits This parameter sets the number of stop bits for each

data value sent. Enter a value of 1 or 2.

N10:50 51 5050 RTS On Delay This parameter sets the number of milliseconds to

delay after RTS is asserted before the data will be transmitted. Enter a value in the range of 0 to 65535.

N10:51 52 5051 RTS Off Delay This parameter sets the number of milliseconds to

delay after the last byte of data is sent before the RTS modem signal will be set low. Enter a value in the range of 0 to 65535.

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Configuring the MVI46-MCM Module MVI46-MCM ♦ SLC Platform User Manual Modbus Communication Module

File M0 Offset Register Content Description

N10:52 53 5052 Minimum

Response Delay

N10:53 54 5053 Use CTS Line This parameter specifies if the CTS modem control line

N10:54 55 5054 Slave ID This parameter defines the virtual Modbus slave

N10:55 56 5055 Bit Input Offset This parameter specifies the offset address in the

N10:56 57 5056 Word Input Offset This parameter specifies the offset address in the

N10:57 58 5057 Output Offset This parameter specifies the offset address in the

N10:58 59 5058 Holding Register

Offset

N10:59 60 5059 Command Count This parameter specifies the number of commands to

N10:60 61 5060 Minimum

Command Delay

N10:61 62 5061 Command Error

Pointer

65535.

is to be used. If the parameter is set to 0, the CTS line will not be monitored. If the parameter is set to 1, the CTS line will be monitored and must be high before the module will send data. Normally, this parameter is required when half-duplex modems are used for communication (2-wire).

address for the internal database. Any requests received by the port with this address will be processed by the module. Verify that each device has a unique address on the network.

internal Modbus database for network requests for Modbus function 2 commands. For example, if the value is set to 150, an address request of 0 will return the value at register 150 in the database.

internal Modbus database for network requests for Modbus function 4 commands. For example, if the value is set to 150, an address request of 0 will return the value at register 150 in the database.

be processed for the port. Enter a value of 0 to 100.

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MVI46-MCM ♦ SLC Platform Configuring the MVI46-MCM Module Modbus Communication Module User Manual

File M0 Offset Register Content Description

N10:62 63 5062 Response

Timeout

N10:63 64 5063 Retry Count This parameter specifies the number of times a

N10:64 65 5064 Error Delay Count This parameter specifies the number of polls to be

N10:65 66 5065 Reserved

N10:66 67 5066 Use Guard Band

Timer

N10:67 68 5067 Guard Band

Timeout

N10:68 69 5068 Spare

N10:69 70 5069 Spare

This parameter represents the message response timeout period in 1 ms increments. This is the time that a port configured as a master will wait before retransmitting a command if no response is received from the addressed slave. The value is set depending on to communication network used and the expected response time of the slowest device on the network.

command will be retried if it fails. Enter a value in the range of 0 to 10.

Use packet gap timeout for messages (Yes or No). Use only in multi-drop applications.

A value of 0 uses the default baud rate or you can set a timeout value in milliseconds (0 to 65535).

Guard Band parameters

With multiple nodes in the network (multidrop), the module must be able to define the time period used to properly recognize the received data sequence as a valid Modbus message. This time period is defined through the guardband timer parameter. Failure to set the Guard Band functionality may cause successive communication errors in the Modbus network.

This functionality is only used for Modbus RTU mode, when the module is configured as a slave device in a multidrop network (RS-422 or RS-485 wiring). In RTU mode, when the module receives sequence of data from another node, it will recognize the end of the message when it detects a 3.5 character gap. The next byte received after a 3.5 character gap will be recognized as the start of a new Modbus message.

The 3.5 character gap depends on the port communication settings, especially the baud rate. The higher the baud rate, the lower the corresponding time period equivalent to the 3.5 character delay.

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Configuring the MVI46-MCM Module MVI46-MCM ♦ SLC Platform User Manual Modbus Communication Module

To enable the Guard Band Timeout parameter:

1 First of all, enable the functionality through the Use Guard Band Timer

parameter as follows:

Use Guard Band Timer = Y

2 Then, set the Guard Band Timeout as follows:

Guard Band Timeout = 0

This configuration will set the module to use a pre-defined time interval for Modbus message recognition calculated for each baud rate. This should provide optimal performance for most applications.

The following guard band timer values will be automatically used by the module with the default parameter value (Guard Band Timeout = 0) is selected:

Baud Guard Band Timer (ms)

110 350 150 256 300 128 600 64 1200 32 2400 16 4800 8 9600 4 19200 2 28800 2 38400 2 57600 1 115200 1

If you still observe a considerable number of communication errors, try to increase the Guard Band Timeout value (in milliseconds) until the network performance is improved.

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MVI46-MCM ♦ SLC Platform Configuring the MVI46-MCM Module Modbus Communication Module User Manual

Port 1 Commands

File M0 Offset Register Content Description

N11:0 to N11:09

71 to 80 5200 to 5209 Command #1 This set of registers contains the parameters for the

first command in the master command list. Refer to the data object section of the documentation.

N11:10 to

81 to 90 5210 to 5219 Command #2 Command #2 dataset

N11:19

1061 to 1070 6190 to 6199 Command #100 Command #100 dataset

Port 2 Commands

File M0 Offset Register Content Description

N12:0 to

1071 to 1080 6200 to 6209 Command #1 This set of registers contains the parameters for the

N12:09

N12:10 to

1081 to 1090 6210 to 6219 Command #2 Command #2 dataset

N12:19

2061 to 2070 7190 to 7199 Command #100 Command #100 dataset

first command in the master command list. Refer to the data object section of the documentation.

Command Control

7800 Command Code Enter one of the valid control command codes in this register to control the

7801 to 7999 Command Data Reserved for future use.

module (9997, 9998, or 9999). Refer to Command Control (page 69, page 25, page 64) for more information.

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MVI46-MCM ♦ SLC Platform Ladder Logic Modbus Communication Module User Manual

3 Ladder Logic

In This Chapter

 Module Data .......................................................................................... 28

 Adding the Module to an Existing Project .............................................. 31

Ladder logic is required for application of the MVI46-MCM module. Tasks that must be handled by the ladder logic are module data transfer, special block handling, and status data receipt. Additionally, a power-up handler may be needed to handle the initialization of the module’s data and to clear any processor fault conditions.

The sample ladder logic, on the ProSoft Solutions CD-ROM, is extensively commented, to provide information on the purpose and function of each rung. For most applications, the sample ladder will work without modification.

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Ladder Logic MVI46-MCM ♦ SLC Platform User Manual Modbus Communication Module

3.1 Module Data

All data related to the MVI46-MCM module is stored in user defined data areas. The user is responsible for setting up the data areas to match the specific application for which the module is used. Each data area is discussed in the following topics.

3.1.1 Backplane Parameters

In this revision of the module, all data to be transferred between the SLC processor and the module is held in the module's M1 file. This simplifies the ladder logic. In order to read data in the module, copy the specific data area in the M1 file into a user defined file. Repeat this operation for each data area. Remember, the maximum data area that can be copied with the COP instruction is 128 words. In order to write data to the module, copy the data in the user defined file to the specific data area in the M1 file. The read and write data operations should be limited to the M1 words 0 to 4999. The modules status data can be read from the M1 file starting at register 7200.

Only one parameter is used in this section of the configuration. The Error Status Pointer parameter defines the location in the module's database

where the error/status data is stored. If the value is set to -1, the data will not be stored in the user data area. A value between 0 and 4939 will cause the module's program to store the data at the specified location.

3.1.2 Port Parameters

These parameters define the operation of each of the Modbus ports on the module. Refer to MVI46-MCM Configuration Data Definition for a definition of each parameter.

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MVI46-MCM ♦ SLC Platform Ladder Logic Modbus Communication Module User Manual

3.1.3 Master Commands

These records define the commands in the master command list. Each parameter is described in the following table.

Parameter Description

Enable

IntAddress

Polllnt

Count

Swap

Node

Func

DevAddress

This parameter defines if the command is executed or disregarded. The following values are valid: 0=Disables the command and it will not execute. 1=The command will be considered for execution each scan of the command list and will be controlled by the PollInt parameter. And 2=The command will only execute if the data associated with the command has changed since the command was last issued. This option is only available for write commands.

This parameter specifies the starting internal register address to be associated with the command. Valid entry for this parameter is 0 to 4999 for Register Address (0 to 65535 for Bit Address).

This parameter defines the minimum number of seconds to wait between the execution of continuous commands (Enable=1). This poll interval command can be used to lighten the communications load on a busy network. Valid entry for this parameter is 0 to 65535.

This parameter defines the number of registers to be considered by the command. Valid entry for this parameter depends on the Modbus specification for the command.

This parameter specifies if the data used in the command must be altered when a Modbus function code 3 reads data from a node on the network. Values that can be assigned are as follows: 0=no swapping of data, 1=swap word values, 2=swap word and byte values and 3=swap byte values. This option is used when interfacing the module with ASCII and floating-point data on other devices.

This parameter assigns the Modbus slave node address for the module to reach with the command on the Modbus network. This parameter can be assigned values from 0 to 255. Most Modbus networks limit the upper value to 247.

This parameter specifies the Modbus function to be performed by the command. Valid entries are 1, 2, 3, 4, 5, 6, 15 and 16.

This parameter defines the starting address in the device being considered by the command. Values entered in this field are dependent on the node’s database definition. Refer to the specific manufacture’s database definition for the device to determine the location of the data to be interfaced.

3.1.4 Status Data

This data area views the status of the module. Use this data to monitor the state of the module at a "real-time rate". Refer to the MVI46-MCM Status Data Definition (page 82) for a complete listing of the data stored in this object. This data can be read from the module’s M1 file starting at register 7200. User data file N30 is defined in the example ladder logic for this purpose.

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Ladder Logic MVI46-MCM ♦ SLC Platform User Manual Modbus Communication Module

3.1.5 User Data

All user data is stored in the module’s M1 file in registers 0 to 4999. This 5000word area is directly accessible from the ladder logic. The COP instruction should be used to move blocks of data between the user data files and the module’s M1 file. This limits the number of accesses to the M1 data area and provides faster system response. In the example ladder logic, N31 holds data read from the module, and N32 stores data to write to the module.

3.1.6 Slave Polling Control and Status

Two data areas can be allocated in the SLC to hold the polling status of each slave on the master ports. This status data can be used to determine which slaves are currently active on the port, are in communications error, or have their polling suspended and disabled. If the configuration supplies an address where this data resides, copy the data from the M1 file to the reserved files in the SLC. Using special blocks, the processor can enable or disable the polling of selected slaves.

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