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March 2008
Modbus-IDA at Hannover
Modbus Conformance &
Interoperability Test
Fair with ODVA:
Accredited by National
Hall 11, Stand E40
Accreditation Service for
In April Modbus-IDA will exhibit at Hannover Fair for
the fifth year. However, this year, you will find Modbus-
IDA in
Hall 11, Stand E40.
We will join ODVA and
offer visitors presentations and information about the
recently announced integration of Modbus devices in CIP
networks. In the fall of 2007,
ODVA extended the CIP
standard to provide seamless
access to Modbus devices,
requiring no change for Modbus
TCP and Modbus serial target
devices or EtherNet/IP target devices (CIP
Library Volume Seven: Integration of Modbus Devices into the
CIP Architecture, Edition 1.0).
Conforming solutions will allow Modbus devices to be
integrated and accessed from CIP originators and
software tools, giving CIP originators basic read/write
access to data in Modbus devices. Modbus data will be
brought into the CIP application in a way that is consistent
with the CIP communications model. Any device that can
function as a Modbus server device will be able to be
included in a CIP network. This includes both simple
devices, such as HMIs, and complex devices,
such as PLCs.
This is good news all around. Users and integrators will be
able to consider and specify product from among the
many Modbus devices available as they work on projects
where a CIP network is being deployed. For suppliers, of
course, this broadens the market for their Modbus
devices. Look for product announcements in the coming
months as suppliers begin to offer CIP originator devices
that support this integration.
We look forward to seeing you at the fair and sharing
information about this and other Modbus developments.
Conformity Assessment
The Measurement Control Device & System Lab (MCDL)
of the Instrumentation Technology and Economy Institute
(ITEI) received accreditation from the China National
Accreditation Service for Conformity Assessment (CNAS).
The laboratory can independently undertake the test of
control network conformance and interoperability,
including Modbus protocol
conformance testing. It can also
undertake safety testing for
measurement, control and laboratory
electric devices, as well as information
technology devices. The laboratory is
the first accredited test laboratory of industrial control and
field bus networks by CNAS in the industrial automation
ITEI received authorization to be a third-party test
laboratory from the Modbus Organization in April 2006.
This is the first time the Modbus Conformance Test will
have received the CNAS domestic accreditation.
Help Celebrate 30 Years of
Modbus Communications
For our celebration of 30 years of Modbus in 2009, we
are still gathering information about the far-flung uses of
the most popular industrial communications protocol in
the world. Tell us about your Modbus experience!
Who has the oldest application that is still working?
What is the installation with the largest number of
Modbus nodes?
What is the oddest or most bizarre application of the
Modbus communications?
We will be selecting stories for future publication as part
of the upcoming celebration.
Send your story to
News about the World’s Most Popular Industrial Protocol
Organization News • Organization News
Meet Some of Our Members...
IntelliCom Innovation’s
mission is to
provide remote device management
solutions to network-enable, monitor,
and control automation devices from
any suitable location. The company’s
core business is within M2M (machine-
to-machine), Ethernet/web solutions
and gateways. Intellicom has extensive
experience with automation and
network connectivity, offering Modbus
products since 1997.
The company has worked with
Ethernet, Modbus, LonWorks, GSM/
GPRS, GPS, Profibus, CAN, Metasys,
BACnet and many communication
protocols. Today, its product lines
include embedded boards,
development kits, standard networking
gateways, web server applications for
monitoring and control. IntelliCom has
customers and installations in over 40
countries around the world.
is a global provider of
software products and services,
focused on engineering applications in
selected domains. The company
leverages its expertise in real-time,
embedded, and PC-hosted software
development combined with
application domain knowledge to
provide customized services to its
clients. SoftDEL partners with
companies developing software-based
products, by providing software
development services and solutions that
quickly transform a product vision into
reality. SoftDel’s partners are typically
the software developers or
manufacturers of high-tech products
that have significant software content or
are themselves software application
developers or service providers.
SoftDEL’s services are delivered in
several domains including process and
factory automation, building
automation, test and measurement
instruments, RTOS/embedded tools.
Since 1983,
Spectrum Controls
been a premier provider of hardware
and related software products for the
industrial controls marketplace.
Products fall into three major
categories: I/O modules, human-
machine interfaces and
communications devices. Spectrum
Controls’ corporate headquarters is
located in Bellevue, Washington.
Spectrum Controls’ products have
been successfully deployed in water/
wastewater, utility/power, oil/
petrochemical, mining/quarrying,
pulp/paper, food/beverage, material
handling, biopharmaceuticals and a
variety of other industries.
Spectrum Controls is an alliance
partner with Schneider Electric and a
Rockwell Automation Global
Encompass Partner, licensed to
develop Allen-Bradley Compatible
Ask a question or help
out a fellow engineer on
the Modbus Discussion
Modbus-IDA Discussion Forums
On February 18, Shawn Norton
wrote to the forum:
I cannot get my Modbus comms to
work between an AB MicroLogix 1100
and a GE Multilin hooked up [with]
I have done a lot of Modbus with the
SLC and ControLogix units but this is
the first with an 1100 and I cannot get it
to talk. Any ideas or sample “msg”
chapssa replied:
The Multilin 735 baud rate setting and
unit (slave) is set with the switch located
in front of the relay.
1. Configure the 735 relay’s baud rate
and slave address to 19200 and 1 (or
any one you desire).
2. Launch the Enervista 735 setup
program. (
3. Configure the setup program baud
rate and slave address.
4. Use RS-232 cable to connect your
PC with DH485 and to the relay.
5. Establish communication (instruction
is located in the instruction book or can
be downloaded from
6. If you still have a problem, try to get
the GE Multilin F485 protocol
converter to communicate with the
7. Attempt to isolate the problem to
setting, relay, protocol converter, or AB
Micrologix 1100.
Carl Ellis added:
Consider using a PC with one of the
freeware or shareware Modbus Master
programs (Simply Modbus, Win-Tech’s
Modscan32, or ModPoll) and a 232/
485 converter for the serial port, to
establish the conditions under which
[the] slave unit operates.
Then go to the Micrologix.
From the Modbus Discussion Forum…
Modbus TCP Communication
with PLC...
Modbus Comms between MicroLogix 1100 and
Multilin 735 Relay...
Carl Burgess suggested:
I just used a MicroLogix 1100 with
Modbus last week. Works a treat.
A few pointers:
There’s a simple getting started guide in
the AB knowledgebase that helped me.
It’s called “Quickstart Modbus Channel
Configuration for MicroLogix 1100/
The serial port (Ch0) has to be set up
for Modbus, not DF1; this means
programming through the Ethernet
port. I just used a crossover patch lead,
and ran the BOOTP server that comes
with RSLinx.
I think you will need a SVC instruction
somewhere in your ladder to service
the comms.
Hopes this helps.
Ken Roach’s advice:
DH485 is a specific A-B protocol that
runs over RS-485 wiring. Don’t mistake
it for other protocols (Modbus, DF1
Half Duplex, ASCII) that also can be
run over RS-485 wiring.
Do you have any information about
error codes, or how you wired up the
connection, or what Modbus function
codes and addresses you are trying to
read or write?
One important thing I’ve found with
the MicroLogix 1100 when you are
using Modbus with the built-in RS-485
port and 1763-NC01 cable is that you
need to set the Handshaking mode to
“No Handshaking (485 Network),”
which is the last on the list of
handshaking options.
Read more comments or add your
advice to this thread, at
In January, Okan Benli posed this
question to the forum:
We will build a SCADA system using
Modbus TCP Protocol. SCADA Host
(SCADA software) will be client and
read data from PLC/RTUs, which are
thought to be servers. However, RTU/
PLCs need to communicate with each
other also. So for an RTU/PLC, is it
possible to open double socket/channel
(via Ethernet port) where one will be
treated as Client and the other as
Server? Or will we need two Ethernet
ports for this purpose?
Mark replied:
Sometimes nomenclature can get mixed
up. Ethernet is the media and does not
care about the protocol.
I have a PC with an Ethernet port and
some software that acts as a Modbus
master and connects to a device (XYZ)
that acts as a Modbus slave.
If the device (XYZ) is capable, it can
act as a Modbus master and connect to
a Modbus slave.
A device can be a master, slave or
It would be normal for the device to
allow all communications through one
Ethernet connection.
The PC I am typing this on will
communicate with Modbus masters,
Modbus slaves, AB EtherNet/IP,
Automation Direct, etc. all at the same
It comes down to the software of the
device. Ethernet will not be the
limitation other than physical
Add your advice to this thread, at
Modbus Products and Innovations
Bernecker+Rainer Modbus TCP
Bus Controller Certified
BC0087 bus controller makes it possible to connect X2X Link I/O
nodes to Modbus TCP. The bus controller is operated with the Modbus TCP library or by
external systems with a Modbus TCP master function. The BC0087 has an integrated 2x
switch for efficient cabling, LEDs for status display, and two RJ45 connections. The
device reaction time is less than one to eight ms (depending on load).
The device can be mounted either vertically or horizontally. Required
accessories include B+R
standard X20 terminal block (12-pin), an X20
supply module for the bus controller and internal I/O supply, X2X link bus
supply, and the basic X20 bus controller, for bus controller fieldbus interface
and bus controller supply module.
The X20BC0087 was tested for conformance to Modbus-IDA
Conformance Test Policy Version 2.1.
ACT’L Announces Talk2M
recently announced Talk2M, which stands for Talk to
Machines, an Internet service designed to address the growing need
for broadband and wireless access to perform remote maintenance
and access distant equipment.
Together with the eWON range of industrial modem-routers, Talk2M
provides new opportunities for Internet remote access and
maintenance, being compliant with a wide range of Modbus RTU or
TCP devices.
Talk2M offers the added value of full integration of IT security
standards by allowing an Internet communication tunnel between the
user and the remote machine without
any IT network security change on
either side. This major breakthrough
allows easy deployment while hiding the
complexity of the IT network infrastructure.
Designed with affordability in mind, Talk2M’s User Interface is your eWON
address book and single click access to your machines!
For more information on Talk2M visit
Advertise Your Modbus Products
on the Modbus Website
With our growing number of site visitors and the increasing
popularity of our device directory, what better place to advertise
your Modbus devices and software than at
E-mail for a rate sheet.
Modbus Products and Innovations
Schneider Electric’s ConneXview
Industrial Ethernet is growing at an
impressive rate. New Ethernet features
are being added to improve network
efficiency and performance. Yet
budgets are not being increased to
manage the rapidly growing, complex
networks being implemented in facto-
ries today. Staff responsible for manag-
ing networks require diagnostic tools to
address this growing gap.
Schneider Electric’s diagnostic tool,
ConneXview, provides customers a
user-friendly, powerful diagnostic
software program that allows
visualization of the entire network on a
single screen, making it easy to monitor,
edit, and troubleshoot the industrial
Ethernet network. ConneXview
provides maintenance managers and
control engineers tools to find and
solve network problems quickly.
ConneXview discovers and queries
devices using both SNMP and Modbus
TCP protocols to provide additional
device-level data not available through
SNMP alone.
Providing Modbus TCP capabilities
gives additional diagnostics to help read
binary and word registers from PLCs
and I/O devices. It can also generate
alarms based on register changes, user-
defined monitors, or limit values.
IT personnel and control engineers
need a view of the network topology
to manage the network effectively. In
the past, control engineers received the
topology from their system integrators,
but often failed to update drawings
when they upgraded their systems.
Building and maintaining a network
topology costs money. Each time the
plant network is upgraded, the
topology also has to be updated.
ConneXview helps eliminate this
expense by discovering all connected
devices on network automatically,
drawing the topology of the network,
and providing a list of all IP and MAC
addresses of the devices.
ConneXview helps instantly visualize the
health of the network, helping to
ConneXview Specifications
Intel 1.2 GHz Pentium 4 CPU or higher
RAM Memory 512 MB or higher
Hard Drive
250 MB of free space or more
Windows 2000, XP Professional
ConneXview Licenses
TCSEAZ01PSFM20SServer Single License with one
local client.
TCSEAZ01PSFM20C Client Single License
Subscription services
TCSEAZ01PSSM20S Single Server Subscription
reduce network downtime. The health
of each segment and device on the
network is shown by color. Green
indicates normal operation, yellow
means there is a potential problem, and
red requires immediate attention.
ConneXview’s client/server architecture
helps decrease travel expenses to
diagnose network problems.
ConneXview allows a trusted system
integrator or a service provider to
monitor the network remotely, check
network performance, or troubleshoot
problems from the other side of the
plant or the other side of the world.
Notifications can be sent by e-mail,
pager, or text message. The
ConneXview network assistant helps
users understand details about an alarm
and suggests actions to solve the
They say those who ignore history are
condemned to repeat it. That’s why
ConneXview offers alarm logging
functionality – to put tools in users’
hands to ensure that past problems
don’t keep coming back. Alarms can be
filtered by time and by device to give
added control in determining what
action to take.
Raedah Saman is Sr. Product Market
Manager at Schneider Electric, Inc.
Visit or
see back page
for details
testing, and
the Modbus
TCP toolkit.
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