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Risks rise as factory nets go wireless

By Phil Hochmuth, Network World
March 14, 2005 12:08 AM ET

Network World - CHICAGO - Wireless technologies for harvesting real-time data off factory networks - and strategies for putting such information to use - were hot topics at last week's National Manufacturing Week conference.

However, some manufacturing IT professionals highlighted the risks involved in deploying wireless technology in factories, or converging plant control networks with IT systems and back-office data centers. Others voiced concerns that gleaning too much data from manufacturing processes could complicate rather than streamline a manufacturing operation.

"Manufacturers are getting closer to where demand and supply are more synchronous," says Bob Parker, an analyst with IDC. "We're seeing the emergence of RFID and sensor networks as the means for collecting the kind of data that is needed to make this synchronization happen."

Among those moving in this direction is General Motors, which has deployed RFID, 802.11 and sensor networks in several plants.

"The goal isn't just to merge manufacturing plants with IT [infrastructure]," says Pulak Bandyopadhyay, group manager for plant floor systems and control group in General Motor's Manufacturing Systems Research Lab in Warren, Mich. "It's the collection of real-time data and what you do with that data you've collected."

Part of General Motors' move toward IT/shop floor integration has been the deployment of standard Ethernet and IP as a backbone technology for connecting most factory equipment and assembly line systems.

"We've been trying to get rid of separate control networks for everything," Bandyopadhyay says. "Everything now is connected to an Ethernet backbone."

Now the automaker is looking toward 802.11 technology in factories to support technicians using wireless PCs and PDAs on the shop floor. GM is also deploying sensor networks, which use tiny nodes that can monitor a process or device and send data to a computer via a wireless mesh - in which each sensor point is also a mini switch that can send data to and receive it from any point on the plant floor. Deploying sensors on machinery could help GM technicians get more data on why a machine broke down and to repair equipment faster. Tying these sensor networks to back-end systems also could help predict when a machine is likely to fail.

"We spend over $1 billion a year in maintenance on our factories," Bandyopadhyay says. "If we have real-time systems that can track mean time to failure on a piece of equipment, that can help us."

GM is also using a mix of wired Ethernet, 802.11 access points and RFID to track parts in some plants - all the way from suppliers to each stage of manufacturing. This gives the company a more exact picture of how far along a car is in the production cycle.

For GM, the ultimate business driver for integrating real-time data from plants, logistics and other areas of the supply chain is a bit more radical. Bandyopadhyay says he wants GM's networks to be integrated to the point where communications with dealerships, logistics and manufacturing can turn the traditional model of manufacturing on its head; instead of making cars based on forecasts of what buyers want, GM will make cars based on what auto consumers want now. But this is still a way off.

"Getting information on what people want out of the dealerships and making changes to the manufacturing process on the fly is still a work in progress," Bandyopadhyay says. "When you connect all of this together, that's where the big payoff is."

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