ModbusNews_Oct2008.pdf

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Fall 2008

News

Modbus Exhibits at ISA

EXPO 2008

Byres Security Announces

First Modbus Firewall

For the first time in the history of industrial automation,

a security module designed specifically for managing the

leading SCADA protocol, Modbus TCP, is commercially

available. Modbus-IDA

member

Byres Security

Inc.

and MTL

Instruments, a division

of Cooper Crouse-

Hinds, are introducing the Tofino™ Modbus TCP

Enforcer Loadable Security

Module (LSM). The device

performs detailed analysis and

filtering of all Modbus TCP

messages, and is certified by

Modbus-IDA. It allows owners of control and SCADA

systems to regulate Modbus network traffic to a level of

detail that has never before been possible, thereby

increasing network security, reliability and performance

of critical systems.

“Deep packet” or “content” inspection for web e-mail

or traffic has been offered in IT firewalls for years, but

nothing has been available for the process control or

SCADA world. Conventional firewall solutions could

either allow or block Modbus traffic, but fine-grained

control was impossible. Since the smooth flow of

Modbus TCP traffic is critical to the average industrial

facility, engineers typically opted to let everything pass

and take their chances with security.

This spring a major U.S. Government agency warned

energy companies about security vulnerabilities,

particularly in the firmware upgrade process used in

control systems. Two major energy companies have

trialled the Tofino™ Modbus TCP Enforcer LSM,

which has allowed them to follow the government’s

guidance and enhance both the security and stability of

their systems.

Learn more about the Tofino™ Modbus TCP Enforcer

at www.byressecurity.com.

Visit the Modbus -IDA booth at ISA EXPO 2008

October 14 - 16 in Houston, Texas. Find us at ISA’s Bus

Station in Booth 1128, along with partner members

Notch Industrial Communications, Byres Security,

Spectrum Controls,

and

Schneider Electric.

Join us for various Modbus presentations in the Bus

Station Theater. Scheduled throughout the show, these

include:

WebPort - Remote Connectivity to Your Automation

System

(Spectrum Controls)

Oct 14 5:00 pm & Oct 15 10:30 am

Integration of Modbus Devices into CIP

(Modbus-IDA)

Oct 14 3:00 pm & Oct 15 2:30 pm

Modbus Security Made Easy

(Byres Security)

Oct 14 2:00 pm & Oct 15 3:30 pm

(also in the Security Exchange Theater Oct 15 12:00 pm)

We look forward to seeing you there!

Visit Modbus-IDA

Booth 1128

ISA EXPO 2008

Meet with:

•

3 Notch Industrial

Communications

•

Byres Security

•

Schneider Electric

•

Spectrum Controls

News about the World’s Most Popular Industrial Protocol

Organization News • Organization News

Meet Some of Our Members...

Sunlux Technologies Ltd.

was

incorporated in 1989 and

today presents itself as an

industrial IT company with

activities in the following

areas:

• Real-time embedded

systems and software

development

• Windows system software

development

• Industrial networking

• SCADA

• Process/factory automation

• Robotic engineering

Sunlux offers a Modbus Source Code

Library for Modbus Master and Slave

for Modbus TCP and Modbus over

serial line (RS232, RS485 and fiber

optic). The company also offers the

Protocon Communication Gateway

family of products, which enables

communication between devices

supporting dissimilar communication

protocols.

( www.sunlux-india.com)

Based in Geisenheim, Germany,

Wachendorff

has been designing,

manufacturing and distributing devices

for controlling, monitoring and

optimizing industrial control equipment

for over a quarter-century. The

company’s major product lines include:

• “OPUS” Control Panels for

mobile platforms

• Incremental encoders

• Industrial electronics

Softing

is a global provider of

hardware and software for industrial

automation and automotive electronics.

In industrial automation, Softing is a

specialist in fieldbus technology. Softing

provides customers the technology to

connect devices, controls, and systems

with the leading communication

technologies.

Softing has a wide range of expertise

including OPC, FDT, and Real-Time-

Ethernet protocols such as Modbus

TCP, PROFINET IO, and EtherNet/

IP. In addition, Softing has established

itself as a provider of sophisticated

diagnostic tools for fieldbus systems.

With distributors around the world,

Wachendorff makes available various

Modbus devices, including EWON.

(www.wachendorff.de)

Shouldn’t your

company be a

member?

Based in Haar (near Munich) Germany,

Softing has subsidiaries in Düsseldorf

and North America.

(www.softing.us)

Modbus Newsletter

This is the newsletter of Modbus-

IDA, the international nonprofit

organization devoted to the evolu-

tion and support of the Modbus

protocols.

For more information about

membership and other services of

Modbus-IDA, please refer to our

website: www.modbus.org

Newsletter Editor:

Lenore Tracey

+1-508-435-7170

lenore@modbus-ida.org

Organization, Inc.

PO Box 628

Hopkinton, MA 01748

USA

ph +1-508-435-7170

fax +1-508-435-7172

info@modbus-ida.org

The Modbus-IDA Mission

Modbus-IDA is a group of independent users and suppliers of automation

devices that seeks to drive the adoption of the Modbus communication protocol

suite and the evolution to address architectures for distributed automation systems

across multiple market segments. Modbus-IDA will also provide the infrastructure

to obtain and share information about the protocols, their application and

certification to simplify implementation by users resulting in reduced costs.

Organization News • Organization News

Michigan-based

Acromag

is a multi-

million dollar international corporation

that combines more than 50 years of

process monitoring and control

experience with a solid background in

Established in 1969

in Europe and 2004

in the United States,

Ascon Corporation

designs and

manufactures

control,

instrumentation and automation

components for the process and

manufacturing industries.

Ascon expanded into North America in

2004 as part of a worldwide business

plan to offer greater sales and support

directly in every major industrial

marketplace.

The company’s portfolio includes:

For over twenty years, industrial

systems integrators have relied on

Moxa

products in major device

networking installations all over the

world. Working with a network of

distributors, Moxa offers industrial

networking products to systems

integrators and value-added

resellers in over 60 countries.

Moxa’s business and environmental

practices are backed by ISO

9001:2000 and ISO 140001

certification. Moxa was established

in 1987 and has offices in Europe,

the United States, China, and

Taiwan.

high-tech computer design. Established

in 1957, Acromag built its reputation

designing critical measurement

instrumentation equipment for the

petrochemical and aerospace industries.

Today, Acromag’s product line

encompasses a wide variety of I/O

devices for manufacturing, military,

scientific, public utility, and

transportation applications. For process

instrumentation, Acromag’s signal

conditioning line features more than

100 transmitters, isolators, alarms, and

computation modules. If networked

I/O is required, Acromag offers analog

and discrete I/O modules for Ethernet,

Modbus, Profibus, and LonWorks®.

For real-time control systems, Acromag

provides a full line of high-

performance analog, digital I/O and

serial I/O bus boards for VMEbus,

PCI, and CompactPCI® computer

systems including IndustryPack® and

PMC mezzanine modules.

(www.acromag.com)

•

AC Series of multifunction PLCs

•

DeltaDue product family of

temperature controllers with data

acquisition and I/O modules

•

Gamma2 family of panel mount

universal controllers, set-point

programmers-controllers, and

indicators

Ascon also offers pressure, level,

humidity, and temperature transmitters,

temperature, infrared temperature

sensors, control valves, rotary/electric

actuators, E/P converters, Thyristor

power controllers, and single phase

solid state relays.

(www.asconcorp.com)

Moxa’s MGate™ family includes

advanced Modbus gateways that

provide flexibility for integrating

industrial Modbus networks of all

types and sizes.

MGate gateways are designed to

integrate Modbus TCP, ASCII, and

RTU devices in almost any master

and slave combination, including

serial master to serial slave, or

simultaneous serial and Ethernet

masters.

(www.moxa.com)

Modbus-IDA Discussion Forums

Modbus Discussion

Q&A

Data Logger Data to

SCADA...

In August, Mutt asked:

How do I get time stamped data from

a logger/RTU into my trends on an

Intouch or similar SCADA?

Adriel Michaud replied:

Depends entirely on the RTU or

protocol used. If your HMI does not

directly support the RTU or device, you

can use an OPC server to access your

data. Note that some protocols or

devices cannot provide a timestamp, so

the timestamp may come from the PC

that the OPC server sits on. Ask your

OPC vendor.

MatrikonOPC has a wide variety of

OPC Servers here:

http://

matrikonopc.com/opc-drivers/

index.aspx

Burnikell added:

I’d go along with the same philosophy

that Adriel suggested. In the past I’ve

used the same approach for getting

data out of Chessel chart recorders and

Eurotherm RTUs. On these occasions I

needed to get the data from the

instrument using a plug-in expansion

card that allowed connection between

the device and a PC using Modbus

protocol. On the PC, I installed an

OPC server, which then allowed me

take the data into other applications (in

my case an AspenTech IP.21 historian).

In my case the timestamp could be

extracted as part of the data transferred

from the recorder/RTU. However, as

Adriel states, it is dependent upon what

the device allows, and if it doesn’t

support timestamp then the OPC

server can append a timestamp.

Add your advice to this thread, at

modbus.control.com/1026248898.

From the Modbus Discussion Forum…

Modbus Write to Register

40002...

Joe Oliphant wrote to the forum:

I’m working with an old ABB ACS400

variable frequency drive. I’m trying to

get it to start from a VB program. This

requires setting a value to register 40002

and then writing values to the

command word at 40001.

I’ve written similar programs for Allen

Bradley and Altivar drives and both of

those have odd quirks where you have

to write more than one register at a

time or write to a goofy offset.

On the above I’ve used Modbus TCP,

but on this antique, it requires an RS232

and CRC checking.

The ABB drive simply refuses to let me

write anything to 40001, 40002, or

40003 but will let me write to any other

valid register. Maybe it’s something with

the CRC. It beats me. I’ve stumped

them at tech support at ABB so if

anyone here has any great ideas, I’d

appreciate it.

Lee Clore offered:

I believe 40002 is mapped to the

Control Word Speed (or Torque)

reference. You likely can’t change it if

the drive is enabled. Depending on the

operating macro, you will need to verify

the enable or run signal is low before

the source can be set. If you are using

the DDCS Bus (fiber converter), then

forget all that—I think that had more to

it.

Lee later added:

Let me clarify that—I think 40002 sets

the control word source (ai, comm,

keypad, etc.), not the actual reference

itself. Something to verify...

Joe Oliphant got back to the group

with new information:

I found the problem. You have to be

connected through the RS485 port. It

will let you change every other register

through the RS232 port but not the

command word at 40001 or the two

holding registers 40002 and 40003.

Anyway, I ordered up a RS232 to RS

485 converter so I’m “holding” so to

say ‘til that arrives.

Mark suggested:

Download Automated Solutions

Modbus Master ActiveX Control.

http://automatedsolutions.com/

products/modbusrtu.asp

Run the pre-built MiniHMI example

application and write to the register that

you are having trouble with. If there is

an issue, MiniHMI will provide a

detailed error description that should

point you in the right direction.

Another user supplied an additional

resource:

1. Download the Modbus TCP slave

simulator at

http://www.peakhmi.com/.

2. Execute your register write to the

simulator. This will validate your code.

If it does not work post your write

command stream, in hex, and I will

look at it.

Read more comments or add your

advice to this thread, at

modbus.control.com/1026244892.

Ask a question or help a

fellow engineer on the

Modbus Discussion Forum:

modbus.control.com

a syndicated community of

Control.com

Phoenix Contact Introduces nanoLine®

Modbus Products and Innovations

nanoLine® is a small programmable controller/relay with Ethernet connectivity, a removable

operator display and easy flow chart programming, designed to control small to midsize machines

that require few I/O points.

Base controller stations are available in 24 V DC, 24 V AC/DC and 115 V AC versions. The on-

board I/O consists of digital inputs and outputs. The nanoLine accommodates up to three I/O expansion modules, bringing

the total possible I/O count to 24 digital inputs and 16 digital outputs.

The nanoLine offers a variety of optional expansion modules, increasing its flexibility. Communication modules for Ethernet,

RS-232, RS-485 and USB allow easy data exchange with Modbus TCP or

Modbus RTU. The optional operator panel can be mounted on the base unit,

through a control cabinet or used as a simple hand-held device. Pluggable

memory and real-time clock modules are also available.

The nanoLine controller uses nanoNavigator software, an intuitive flow chart

language that allows for easy programming and hardware configuration. The

user can create the control logic with just six simple instructions. Most

programs can execute under one millisecond. nanoNavigator software can be

downloaded for free at www.phoenixcontact.com/nanoLine.

Plant Integration with Mynah’s MiMiC Simulation and Virtual

IO Module Network Gateway

Mynah Technologies writes a lot about MiMiC Simulation and all that it can do, including its ability to

simulate IO over Modbus TCP and integrate to Schneider Unity, PLCs, Citect SCADA, HIMA, DeltaV,

and other modern control systems. Rarely does MYNAH mention its Virtual IO Module Network

Gateway (VIM), which allows users to integrate plant devices and existing IO over Industrial Ethernet

networks quickly and easily. This product makes seamless integration of plant floor devices and modern

control systems easy.

VIM provides a native DeltaV IO interface to industrial Ethernet devices using Modbus TCP or

Ethernet/IP protocols. MYNAH also has a PLC IO Interface that allows users to migrate existing GE

Genius Bus, Modicon S908, and Allen-Bradley 1771 Remote IO to any modern control system.

Key features of the DeltaV Virtual IO Module include:

•

Seamless Integration with DeltaV.

Each Virtual IO Module is seen by the controller as up to

four Virtual DeltaV Serial Cards. Commissioned Virtual IO Modules are auto-sensed by DeltaV auto-sense IO

function as DeltaV Serial Card(s). Data set configuration is done in the DeltaV Explorer in the same manner as a

DeltaV Serial Card. IO signals can be used in DeltaV Control Modules and displayed on DeltaV Operator graphics.

•

Intuitive Network Setup.

Graphical, drag-and-drop functionality makes setting up the plant Ethernet network easy.

•

Powerful Integration Solution.

Each Virtual IO Module can emulate up to four DeltaV serial cards and support up

to 128 Serial Card Datasets of information from 32 network addresses. Communication over the plant Ethernet

network is fast and efficient. User configurable IP addressing allows the Virtual

IO Module to be used in almost any plant environment regardless of network

scheme.

•

Modular, Flexible Package.

The DeltaV Virtual IO Module mounts the same

way as the DeltaV controller. It uses a DeltaV 2-wide or 4-wide carrier and

power supply connect to the DeltaV IO Bus by the carrier side connector.

More information about VIM can be found at www.mynah.com/vim/vim_network_faq.asp.

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