Presentation to VDMA Presentation to VDMA 04 Oct 200404 Oct 2004

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ContentsContents

2

Benefits of Modbus 3

Modbus-IDA.Org 5

Affiliate Organisations: IEC, IAONA, ITEI, etc. 10

Device Development & Certification 13

Modbus-IDA.org - The Web Community 14

Summary of 2003/2004 Progress 16

Answers to the VDMA Technical Questionnaire 17

The Modbus Protocol: BenefitsThe Modbus Protocol: Benefits

3

Modbus is the World’s #1 industrial protocol - with the largest installed base. (*)

It is truly open and free (no fees are charged, and information easily accessible without the need of being enrolled in any organization).

It is very simple, easy to deploy, and cost effective.

It offers much better scalability than more complex alternatives.

It is Media independent with implementations over Ethernet, Serial lines, wireless, fibre optic, radio, etc.

Thousands of Modbus over serial line devices and hundreds of Modbus TCP/IP devices have been developed and are available.

It is suitable for a very wide range of industrial applications.

Modbus over Ethernet (Modbus TCP/IP), has gained a very strong place in the market during the last three years. The market is driving this trend.

(*) According to IMS Research

Ethernet TCP/IP Modbus devicesEthernet TCP/IP Modbus devices

More than 350 hardware devices availableExamples:• Ebtron: Airflow measurement station• Acrison: Weight Feeder controller• DVT - Cognex: Vision sensors• Flowserve: Flow Controller• Honeywell - Eurotherm: Recorders• Ormec:Motion controller• GE Fanuc: PLCs

More than 150 software products availableExamples:• Matrikon: OPC server

Multiple tools and toolkitsExamples:• Ethereal - Cimetrics: Protocol analyzers• Ergotec: Java Beans

4

ModbusModbus--IDA.org: What is it?IDA.org: What is it?

Modbus Organization, Inc. is a non-profit, independent organization with a web based community known as Modbus-IDA.org.

5

ModbusModbus--IDA.org: Mission statementIDA.org: Mission statement

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"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."

Modbus.org and come together Modbus.org and come together

7

ObjectiveAddress the larger scope needed to accomplish effective distributed architectures by the definition, publication and promotion of technical specifications to provide an “interface for distributed automation”.

Common objective and interests Common technical view

• Use of Ethernet TCP/IP as a basis for industrial communications,• iDA had already adopted Modbus protocol,

Common organizational approach • Open organisational approach, not dominated by a single vendor.

ModbusModbus--IDA Expanded MissionIDA Expanded Mission

Modbus TCP/IP

Modbus serial line

2003

Short/Mid TermNext steps

Long Term Vision

Expanded Service Suite:Global Data

Network ManagementI/O Scanning

DiagnosticsSecurity

Fully Distributed Architecture:Web Services

Services and Functionalities to be defined

Modbus TCP/IP

Modbus serial line

20032003

Short/Mid TermNext stepsShort/Mid TermNext steps

Long Term VisionLong Term Vision

Expanded Service Suite:Global Data

Network ManagementI/O Scanning

DiagnosticsSecurity

Fully Distributed Architecture:Web Services

Services and Functionalities to be defined

8

Role of ModbusRole of Modbus--IDA relative to other IDA relative to other organisationsorganisations

Modbus-TCP

Managed by the IEEE

organization (www.ieee.org)

Internet suite of protocols. Managed by the IETF organization

(www.ietf.org)

Modbus Protocol suite -managed by the Modbus-IDA

organizationTransparent Ready Services managed by Schneider Electric

Services

Ethernet 802.3 and Ethernet II

TF MIB

IP

UDP

SNMP RTPS DHCP TFTP

TCP

FTP HTTP Modbus

Network Manag.

Publish Subscribe Faulty Device Replacement

Web Server Messaging

Physical Layer

Network Layer

Transport Layer

Application Layer

User ApplicationTR “Services”

TCP Layer

Reduced Stack

Modbus I/O

Scanner

9

ModbusModbus--IDA and the IECIDA and the IEC

10

Modbus-IDA has been awarded “Category ‘D’ Liason status by the IEC (International Electrotechnical Commission) the world’s leading standard organization for electrical products and services.

Modbus-IDA is participating in the definition of digital communicationsfor the manufacturing and process automation environments especially in the in the area of industrial Ethernet and Real Time Ethernet (SC65C WG11).

IEC has accepted the Modbus and RTPS (Real-Time-Publish-Subscribe) protocol as an IEC PAS (Publicly Available Specification)IEC/PAS 62030/Ed.1.

Modbus-IDA intends to actively work toward incorporation of this PAS into the IEC 61158 at the next maintenance opportunity.

ModbusModbus--IDA and IAONAIDA and IAONA

11

Modbus-IDA is a member of the IAONA consortium - the independent platform organization for industrial Ethernet .

At the Hannover Fair Modbus-IDA signed the updated IAONA MOU to work with other member organizations on topics of common interest including Security Aspects, Cabling, the use of IEEE 1588, and System Aspects. This serves both the interests of users and providers in avoiding too many different specifications.

Ethernet Powerlink Specification Group (EPSG), EtherCATTechnology Group (ETG), Interests Group SERCOS Interface (IGS), Modbus-IDA, and ODVA participated at the meeting which led to a renewed and enlarged Memorandum of Understanding.

ModbusModbus--IDA.org and the ITEI in ChinaIDA.org and the ITEI in China

12

Modbus has been working with the ITEI agency in China since early 2003

Mr. Feng Xiaosheng, a senior representative of Instrumentation Technology & Economy Institute (ITEI) has served as a Modbus Organization board member since February 2003.

In December 2003, ITEI organized an important delegation from China, including other government agencies, to visit the US and Canada to review the Modbus Organization, the certification system, visit users and understand the general position of Modbus in themarket.

Following the visit, the ITEI has indicated its desire to standardize Modbus in in China and pursue establishing a certification centre there for the Asia/Pacific region.

The certification of Modbus TCP/IP devices (servers) and Modbus over serial line devices is made by the University of Michigan.

• A Modbus Developers Toolkit is available and includes:– Application Protocol Specification– Implementation Guides– Developers software

There are plans to set up certification centers in Europe and in Asia.

ModbusModbus--IDA.org: Device Development and IDA.org: Device Development and CertificationCertification

IO S

cann

er

FDR

Glo

bal D

ata

Mod

bus

TCP/

IP

Mod

bus

Seria

l Lin

e

13

ModbusModbus--IDA.org: The web communityIDA.org: The web community

14

The Modbus-IDA.org web community offers to any member of the industrial community the following services:

• Discussion forum: Free discussion forum for users and developers.

• Modbus Library: Modbus protocol standard documents

• Developers corner: Registered users can share information and resources about the Modbus protocol

• Modbus devices database: A database of Modbus serial line and TCP/IP devices

• RFC Process to input proposed additions to the protocol specification.

• Others: FAQs, Sponsors corner, etc.

ModbusModbus--IDA.org: The web communityIDA.org: The web community

The Modbus-IDA.org web community offers to any member of theindustrial community the following services:

Modbus Library: Modbus protocol standard documents

Modbus devices database: A database of Modbus serial line and TCP/IP devices

Developers corner: Registered users can share information and resources about the Modbus protocol

Latest devices: Focal point for new devices introduced.

Discussion forum: Free discussion forum for users and developers.

15

Summary of Progress over the last 12 Summary of Progress over the last 12 months:months:

16

Sep 2003:- Joined together Modbus.org and iDA group to form Modbus-IDA with expanded mission.Oct 2003:- Successful ISA show debut for the new organisation.Dec 2003:- Received delegation from China (ITEI and SAC agencies attached to the government, PRC)Dec 2003:- Awarded "Category D" liaison status by the International Electrotechnical Commission (IEC).Jan 2004:- Joined IEC 65C WG11 concerning RTE specification development. IEC assigned Modbus-

RTPS profile# CPF 15 in the 61784

Jan 2004:- Released the Modbus Toolkit – free to membersApril 2004:- Successful participation at the Hannover Fair with our own exhibit. Signed the MOU with

IAONA to support work on Industrial Ethernet standardization and promotionMay 2004:- Participated in WG11 Meeting in Beijing; Received by the ITEI concerning our effort to get

Modbus accepted as a Chinese National Standard.

May 2004:- Submitted Modbus-RTPS specification as a proposed IEC PAS (Publicly Available Specification)

Aug 2004;- Setup Training and implementation program for a Modbus conformance test centre in China -to be implemented January 2005.

Sep 2004:- Modbus-RTPS officially approved as an IEC -PAS with a positive vote from over 95% of the national committees.

Oct 2004:- Multi-vendor exhibit at ISA 2004 Houston, TX with participating members.

Answers to the Technical QuestionnaireAnswers to the Technical Questionnaire

17

Modbus Technology OverviewModbus Technology Overview

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MODBUS APPLICATION LAYER

MODBUS MAPPING ON TCP/IP

TCPIETF RFC 793

IPIETF RFC 791

Ethernet II / 802.3IEEE 802.2

SERIAL LINE MASTER / SLAVEModbus messaging on Serial line implementation guide (Under dev.)

TIA/EIA-232 -F TIA/EIA-485 -A Ethernet Physical Layer Phy 01

Link 02

Net 03

Transp 04

Appli 07

OSI STACK

Other

Other

Available at Modbus-IDA.org

Available at www.ietf.org

Available at www.ieee.org

DiagnosticDiagnostic

19

Remote diagnostic comprises • Diagnostic of all components of the network• Diagnostic of all Modbus TCP/IP devices as well as Modbus serial line devices

through gateways• Diagnostic of any application located in all Modbus devices

Remote diagnostic is independent of the media used • Phone line• Ethernet • Wireless, ..

It is also independent of the location where it is requested thanks to IP capabilities

Diagnostic (2)Diagnostic (2)

20

Modbus messaging allows to get any type of diagnostic information

Any Modbus device defines its diagnostic information interface

In addition of Modbus other standard protocols can be used like • SNMP for network management with standard and private MIB • Web services for device and application diagnostic with predefined and user

defined Web pages

Software protocolSoftware protocol

21

The following list of standard protocols is supported:• FTP• HTTP• SNMP• DHCP• SMTP• NTP• TFTP

For real time communication the following automation business standards are supported:

• Modbus TCP• RTPS (Real Time Publish/Subscribe)

No dedicated hardware – all is “COTS” (commercial of the shelf).

Communication bandwidth can be reserved for real time communication in order to master, to protect and to minimize the influence of Standard internet protocol.

Network structureNetwork structure

22

Network topology must be appropriate to application requirements

Ethernet 100 Mbps Ethernet/ Full duplex is the recommended configuration.

Modbus allows redundancy of medium as well as Ethernet interface. Use of “COTS” (commercial of the shelf) components can take advantage of available features such as redundancy.

Any Ethernet Standard components can be used to develop easily aModbus TCP interface

Modbus-IDA refers to the IAONA Planning and Installation Guide

RJ45 IP20 connectors and M12 IP67 connectors are the two recommended solution

Ring structures: Redundant ring, self healing.

SecuritySecurity

23

Modbus-IDA works within IAONA and IEC SC 65C to analyse the requirements and define possible solutions based on standards

Access right management, and basic authentication are used to protect resources within a Modbus device

Network infrastructure configuration is also recommended by Modbus-IDA to protect a automation cell to external attack

Access control list in network infrastructure devices

Project PlanningProject Planning

24

Today interoperability between the existing solutions is not possible• there is no common subset to exchange application data

Coexistance of the different solutions is possible

IT standards are used commonly to manage Modbus devices• SNMP manager can handle agents in a common way• FTP client can upload/download data from different solutions• IP address management with BOOTP/DHCP• WEB access with HTTP• NTP to synchronize cloks• SNTP to send alarm and to notify event using E-mail

TCP/OPEN

AddressingAddressing

25

IP Addressing complexity must be hidden to customers by using device name

Address server (DHCP, BOOTP) allows to manage a large number of addresses

To avoid shortage of V4 addresses on a local network• IP subnetting• private address range• Classeless addressing

Usage of V6• Evolution of IT standard will be encorporated in future Modbus products• not expected in automation in the near future• In a first step V4/V6 Routers can be used to migrate

Usage of MAC address causes a problem when replacing a device• Use of device name (Faulty Device Replacement) can be a solution

Performance considerationsPerformance considerations

MODBUS-IDA is currently not covering hard real time• It is member of IEC real time WG• A suitable solution will be taken into account by MODBUS-IDA

Optimized implementation of Modbus TCP ( I/O Scanning) has already been developed in order to get traditional Field bus

• Many applications have already been installed

26

Performance Performance

I/O scanning time

# nodes read write response time (*) PLC cycle time I/O scan time

29 1 word 0 words 0,7ms 1 ... 3ms 4,7ms

29 16 words 0 words 0,7ms 1 ... 3ms 4,7ms

29 68 words 0 words 0,7ms 1 ... 3ms 4,7ms

29 16 words 16 words 0,9ms 1 ... 3ms 5,6ms

29 16 words 16 words 0,9ms 10ms 5,2ms

29 68 words 68 words 0,9ms 1 ... 3ms 7,3ms

58 16 words 16 words 0,9ms 1 ... 3ms 12,2ms58 16 words 16 words 0,9ms 10ms 10,4ms

58 16 words 16 words 0,9ms 20ms 9,6ms

27

(*) response time of a single scanned node

Max. bandwidth used: < 10 %

Performance improvementPerformance improvement

Improvements• The use of new component and technology allow to improve in a

continuous way performance • Optimised Modbus TCP/IP implementation within I/O nodes

28

MigrationsMigrations

29

Link to IT• Direct database access for devices• Web services, SOAP

SCADA• Already available on Ethernet• Modbus TCP installations already availabe• Use of OPC

Gateways to field bus systems• Covering the traditional field busses

Performance Performance

I/O scanning time

(*) response time of a single scanned node

Max. bandwidth used: < 10 %

I/O Scanning time : TIOS

0

5

10

15

20

25

1 5 10 20 30 40 50 60

Number of scanned devices

Tim

e (m

s)

30