Ride the enterprise service bus

The typical IT environment is a federation of systems. The term “federation” in the IT world is applied to collections of applications from multiple vendors that work together to support business processes. A federation may include separate applications for material management, order processing, supply chain management, etc.

09/01/2006


The typical IT environment is a federation of systems. The term “federation” in the IT world is applied to collections of applications from multiple vendors that work together to support business processes. A federation may include separate applications for material management, order processing, supply chain management, etc.

Even when a company has selected a primary ERP vendor, there is often a federation of legacy systems supporting unique business processes. Federated systems are expensive and integration efforts are often a major portion of IT budgets. An increasingly common method to reduce integration costs is an enterprise service bus (ESB) sometimes called an enterprise integration bus (EIB). These are not electronic buses in the sense of an electrical backplane bus, but special applications that run on redundant servers and act as concentrators and distributors of data. Manufacturing systems that must exchange data with business systems will probably need to connect to the company's ESB.

Enterprise service buses are an architectural concept that includes open standards, message-based communications, message routing capabilities, and service discovery mechanisms. There is no single definition of an ESB product, but a working rule is that it is a system that provides a single source of shared information, a single location for discovering application services, and a single destination for using services.

Several vendors are providing ESBs, but a few manufacturing companies also have built their ESB systems on open standards and focused on their unique integration problems. Once a company has selected an ESB system, then the IT department will attempt to have all applications that exchange data (including manufacturing applications) use the ESB instead of implementing point-to-point connections. Unfortunately, there is little interoperability among ESB systems, so each application interface must be customized for the chosen ESB.

Five main ESB elements are important in connecting applications to an ESB: a transport layer, a discovery layer, a transform layer, a protocol layer, and a payload layer. All layers are based on XML technologies, and newer ESBs are based on Web services.

ESB layers

The transport layer handles moving XML messages from one application to another through the common server. This eliminates point-to-point interfaces and provides a central mechanism to manage and view inter-application communication. HTTP messages and JMS (Java Message Services) are common open-source implementations of the transport layer. OPC-UA ( www.opcfoundation.org ) may become the standard transport layer mechanism for manufacturing system integration.

The discovery layer allows applications to discover the services and data provided by the ESB. This is typically handled by UDDI services ( www.uddi.org ) in the IT environment. The transform layer provides methods that convert data from the sender's format to the receiver's format through a set of application specific transform rules, using some form of XML transformation, such as XSLT scripts.

The protocol layer implements the formal definition of allowable message transactions and is often based on standards such as OAGIS ( www.openapplications.org ), RosettaNet ( www.rosettanet.org ), and the ISA 95 Business to Manufacturing Transaction standard.

The payload layer defines the data that makes up the body of the message. For manufacturing area, ISA 95 Enterprise/Control Integration standard with the associated WBF B2MML schemas ( www.wbf.org ) and the OAGIS BOD (Business Object Documents) are most common.

If your company has not yet selected an ESB, then ensure the manufacturing IT group is involved in selection. If applications are not compatible with the ESB selected, custom interfaces will need to be developed, increasing your cost to ride the enterprise system bus.


Author Information

Dennis Brandl, dbrandl@brlconsulting.com , is president of BR&L Consulting, Cary, N.C., which is focused on manufacturing IT.




No comments
The Engineers' Choice Awards highlight some of the best new control, instrumentation and automation products as chosen by...
Each year, a panel of Control Engineering editors and industry expert judges select the System Integrator of the Year Award winners.
Control Engineering Leaders Under 40 identifies and gives recognition to young engineers who...
Learn more about methods used to ensure that the integration between the safety system and the process control...
Adding industrial toughness and reliability to Ethernet eGuide
Technological advances like multiple-in-multiple-out (MIMO) transmitting and receiving
Virtualization advice: 4 ways splitting servers can help manufacturing; Efficient motion controls; Fill the brain drain; Learn from the HART Plant of the Year
Two sides to process safety: Combining human and technical factors in your program; Preparing HMI graphics for migrations; Mechatronics and safety; Engineers' Choice Awards
Detecting security breaches: Forensic invenstigations depend on knowing your networks inside and out; Wireless workers; Opening robotic control; Product exclusive: Robust encoders
The Ask Control Engineering blog covers all aspects of automation, including motors, drives, sensors, motion control, machine control, and embedded systems.
Join this ongoing discussion of machine guarding topics, including solutions assessments, regulatory compliance, gap analysis...
News and comments from Control Engineering process industries editor, Peter Welander.
IMS Research, recently acquired by IHS Inc., is a leading independent supplier of market research and consultancy to the global electronics industry.
This is a blog from the trenches – written by engineers who are implementing and upgrading control systems every day across every industry.
Anthony Baker is a fictitious aggregation of experts from Callisto Integration, providing manufacturing consulting and systems integration.
Integrator Guide

Integrator Guide

Search the online Automation Integrator Guide
 

Create New Listing

Visit the System Integrators page to view past winners of Control Engineering's System Integrator of the Year Award and learn how to enter the competition. You will also find more information on system integrators and Control System Integrators Association.

Case Study Database

Case Study Database

Get more exposure for your case study by uploading it to the Control Engineering case study database, where end-users can identify relevant solutions and explore what the experts are doing to effectively implement a variety of technology and productivity related projects.

These case studies provide examples of how knowledgeable solution providers have used technology, processes and people to create effective and successful implementations in real-world situations. Case studies can be completed by filling out a simple online form where you can outline the project title, abstract, and full story in 1500 words or less; upload photos, videos and a logo.

Click here to visit the Case Study Database and upload your case study.