Engineering and IT Insight: What’s the best manufacturing operations management systems design?

Should your manufacturing operations management (MOM) systems be centralized or distributed? These key considerations can help you decide. MOM includes MES (manufacturing execution systems), LIMS (laboratory information management systems), WMS (warehouse management systems), tank farm management systems, and AMS (asset management systems).


Dennis BrandlSome of the most frequently asked manufacturing IT questions deal with MOM systems and architectures. MOM is short for manufacturing operations management and includes the functions of MES (manufacturing execution systems), LIMS (laboratory information management systems), WMS (warehouse management systems), tank farm management systems, and AMS (asset management systems). The functions of MOM are defined in the ANSI/ISA 95 standards, and these standards have served as the basis for most new MOM implementations. ANSI/ISA 95 defines the tasks that a MOM can perform, but not the architecture of a MOM solution. MOM architectures are defined by vendors and by their applications suites.

One important point for an IT group to consider is that MOM implementations differ from centralized ERP implementations. In the centralized ERP model there is strong pressure to make all sites look the same, from the viewpoint of the business process used to run the site. This is because localization (the activity of defining local rules that differ at each site) is expensive and difficult to implement. The ERP model of standardization cannot be carried down to MOM systems. Sites that produce the same products often have different equipment layouts, operating rules, regulatory rules, and personnel environments and, therefore, require different MOM configurations. Sites that produce different products will vary even more in MOM configurations.

Controls and IT Integration, Control Engineering

For these reasons MOM systems generally are considered site- or area-level systems, with workflows, recipes, resource definitions, and production optimization rules that are highly customized for each site. MOM systems usually become mission critical, so they also have high availability and second-to-subsecond response time requirements. This means that MOM systems have usually been located on-site with local customization support. MOM systems can provide well-documented operational benefits in yield improvements, defect reductions, and business-level integration, but they are often hard to economically justify because of the perceived requirement for on-site servers and support.

There is an alternative to on-site servers and support. MOM systems can be decentralized or centralized. The classical model has been decentralized, with servers located within a site running local MOM applications. On-site systems remove the problem of offsite communication failures and help provide the required high availability and local configuration control. The decentralized model requires local server rooms and an IT infrastructure that is hard to justify and maintain at small sites. Many small sites may never get any MOM systems to support their operations because of the inability to support the servers and applications.

Centralized MOM systems provide an alternative that should be considered for medium-to-small sites. In the centralized MOM model a geographically centralized small server farm is used. The server farm hosts VMs (virtual machines) for each site and is connected through a corporate WAN to each site. With dedicated VMs for each site and moderate speed WAN connections, the centralized system can usually meet the response time requirements. The MOM server farm can be centrally managed and supported, often without requiring a physical presence. A centralized support staff can provide the customization and configuration that each site needs, also often provided without requiring an on-site presence. This model works well in areas and countries that do not have a pervasive power and communication infrastructure or that do not have the local IT and MOM resources available for full-time support.

The communication link between the server farm and the sites can be a problem for a decentralized MOM implementation. No one wants to shut down a site because someone outside the site cut the connecting communication line. This is the backhoe-Bob syndrome: if Bob’s backhoe cuts the main phone/Internet line to the plant, the plant still must operate. There is a solution to this communication problem with which we are all familiar: smartphones and pad or tablet computers.

Smartphones and pad computers usually have two communication channels available, 3G (or 4G) and Wi-Fi. This built-in redundancy, combined with mobility, provides a great tool for MOM services. Normal communication would be provided through a site’s Wi-Fi network. In the case of Internet or intranet communication failure, the devices can convert to 3G/4G communication, using the same pad or phone (PAP) applications. When sites lose the corporate connection, 3G/4G connections often remain because these are provided through different connections.

PAPs also have other features that make them suitable for MOM interfaces. Most PAPs have cameras that can be used as barcode scanners. They have local Wi-Fi connections that can connect to wireless printers and have text messaging for notifications from MOM applications. PAPs also include browsers, and many MOM systems support browser user interfaces (UIs). Small mobile devices are the ideal MOM interface device.

PAPs also provide a third level of redundancy, if the MOM applications can send commands and receive responses using text messages. Text messages do not require a 3G/4G connection, just a normal cell phone connection. A MOM system can be configured to provide time critical information for mission critical processes using text messages. If normal communications are out but phone service remains, then the site can continue to operate, even if the MOM system is remotely located.

MOM systems provide significant benefits for those who have implemented them. The addition of PAPs (phones and pads) as interface devices with centralized MOM server farms means that medium and small sites will also gain these benefits. Encourage your MOM vendors to support mobile device interfaces. These are usually browser interfaces that work in the small screen size of a smartphone or small pad computer. Marry centralized MOM systems with PAPs to bring manufacturing operations management support to all of your sites, large and small.

- Dennis Brandl is president of BR+L Consulting in Cary, NC, His firm focuses on manufacturing IT. Contact him at Edited by Mark T. Hoske, Control Engineering,

Related reading

More on MOM: Cut costs with manufacturing IT standards, best practices—If you had the opportunity to reduce automation project costs or times by over 30%, reduce costs for plant-to-enterprise integration by over 70%, or reduce maintenance support costs by over 10%, you would think that most manufacturing engineers or executives would stop ignoring this opportunity.[tt_news]=6400

Engineering and IT Insight: How to convert a project into a product—Extra effort is required to convert a manufacturing IT project into a successful product. Advice follows on how to do it. (If you’re considering buying software that sounds or test drives more like a project, you may want to look at other software.)[tt_news]=53591

Engineering and IT Insight: Keep documentation in sync with code—Deferring software documentation can create future difficulties, slowdowns, and errors. Ensure user, design, and test documents are up to date with software code.[tt_news]=43262

No comments
The Top Plant program honors outstanding manufacturing facilities in North America. View the 2013 Top Plant.
The Product of the Year program recognizes products newly released in the manufacturing industries.
The Engineering Leaders Under 40 program identifies and gives recognition to young engineers who...
A cool solution: Collaboration, chemistry leads to foundry coat product development; See the 2015 Product of the Year Finalists
Raising the standard: What's new with NFPA 70E; A global view of manufacturing; Maintenance data; Fit bearings properly
Sister act: Building on their father's legacy, a new generation moves Bales Metal Surface Solutions forward; Meet the 2015 Engineering Leaders Under 40
Cyber security cost-efficient for industrial control systems; Extracting full value from operational data; Managing cyber security risks
Drilling for Big Data: Managing the flow of information; Big data drilldown series: Challenge and opportunity; OT to IT: Creating a circle of improvement; Industry loses best workers, again
Pipeline vulnerabilities? Securing hydrocarbon transit; Predictive analytics hit the mainstream; Dirty pipelines decrease flow, production—pig your line; Ensuring pipeline physical and cyber security
Upgrading secondary control systems; Keeping enclosures conditioned; Diagnostics increase equipment uptime; Mechatronics simplifies machine design
Designing positive-energy buildings; Ensuring power quality; Complying with NFPA 110; Minimizing arc flash hazards
Building high availability into industrial computers; Of key metrics and myth busting; The truth about five common VFD myths

Annual Salary Survey

After almost a decade of uncertainty, the confidence of plant floor managers is soaring. Even with a number of challenges and while implementing new technologies, there is a renewed sense of optimism among plant managers about their business and their future.

The respondents to the 2014 Plant Engineering Salary Survey come from throughout the U.S. and serve a variety of industries, but they are uniform in their optimism about manufacturing. This year’s survey found 79% consider manufacturing a secure career. That’s up from 75% in 2013 and significantly higher than the 63% figure when Plant Engineering first started asking that question a decade ago.

Read more: 2014 Salary Survey: Confidence rises amid the challenges

Maintenance and reliability tips and best practices from the maintenance and reliability coaches at Allied Reliability Group.
The One Voice for Manufacturing blog reports on federal public policy issues impacting the manufacturing sector. One Voice is a joint effort by the National Tooling and Machining...
The Society for Maintenance and Reliability Professionals an organization devoted...
Join this ongoing discussion of machine guarding topics, including solutions assessments, regulatory compliance, gap analysis...
IMS Research, recently acquired by IHS Inc., is a leading independent supplier of market research and consultancy to the global electronics industry.
Maintenance is not optional in manufacturing. It’s a profit center, driving productivity and uptime while reducing overall repair costs.
The Lachance on CMMS blog is about current maintenance topics. Blogger Paul Lachance is president and chief technology officer for Smartware Group.