Invensys’ Wonderware Business Unit Announces Release of DAServer for Modbus® Serial Devices First Serial Communications Protocol DAServer Built with ArchestrA® DAS Toolkit

LAKE FOREST, Calif., Oct. 9, 2003 – Wonderware, a business unit of Invensys Systems, Inc., today announced the release of a new DAServer (DataAccessServer) based on the Modbus® serial protocol. The Wonderware DAServer for Modbus Serial Devices is the first serial communications interface to be built with Invensys’ ArchestrA DAS Toolkit. All previously released DAServers have supported Ethernet-based protocols.

DAServers are Wonderware’s next-generation I/O servers built on ArchestrA technology, which offer enhanced communication diagnostics and performance. Wonderware DAServers are designed to provide simultaneous connectivity between plant-floor devices and client applications based on Wonderware SuiteLink, DDE and OPC® protocols, as well as the Modbus Serial protocol with this latest release.

“The DAServer for Modbus Serial Devices is distinct from all of the preceding DAServers produced by Wonderware because it is the first to support a serial protocol,” said Tim Black, device integration manager at Wonderware. “The Modbus protocol is the first serial protocol we chose to support because it is one of most widely accepted de facto standards today.”

The ArchestrA DAS toolkit used to create the new Modbus DAServer is designed to make building DAServers easier through the open ArchestrA software architecture. Using this toolkit, Wonderware, other Invensys companies and third parties are building DAServers, which are next-generation plant communications interfaces built on ArchestrA technology.

The Wonderware DAServer for Modbus Serial Devices was specifically tested with the Quantum, TSX Momentum and Modicon® Micro controllers.

About Wonderware

Wonderware is a business unit of Invensys Systems, Inc. and is the world’s leading supplier of industrial automation software. Founded in 1987, Wonderware pioneered the use of the Microsoft Windows(R) operating system in HMI automation software for manufacturing operation systems. Wonderware powers intelligent plant decisions in real time.

Based in Lake Forest, Calif., Wonderware has regional sales and development offices throughout North America, Europe, Latin America and Asia to provide support to its network of more than 160 distributor offices. Wonderware has approximately 300,000 software licenses in approximately 100,000 plants worldwide, which is about 30 percent of the world’s 335,000 plants with 20 or more employees.

About Invensys

Invensys is a global leader in production technology. The group helps customers improve productivity, performance and profitability using innovative services and technologies and a deep understanding of their industries and applications.

Invensys Production Management works closely with customers to increase performance of production assets, maximize return on investment in production and data management technologies and remove cost and cash from the supply chain. The division includes APV, Avantis, Eurotherm, Foxboro, IMServ, SimSci-Esscor, Triconex and Wonderware. These businesses address process and batch industries -- including oil and gas, chemicals, power and utilities, food and beverage, and personal health care -- and the discrete and hybrid manufacturing sectors.

Invensys Rail Systems is a global leader in the design, manufacture, supply, installation, commissioning and maintenance of safety related rail signaling and control systems as well as a complete range of rail signaling and communications products. The business includes Westinghouse Rail Systems Limited (WRSL), Dimetronic Signals, Safetran Systems, Burco Services, Westinghouse Signals Australia and Foxboro Transportation. WRSL was recently awarded two contracts valued at more than 850 million pounds (US$1.3 billion) for the renewal of signaling on the London Underground.

Invensys also currently serves other market sectors through its Development Division. The businesses in this division are: Appliance Controls, APV Baker, Climate Controls, Hansen Transmissions, Lambda, Metering Systems and Powerware. Invensys is actively seeking to develop these businesses through equity partners or new owners.

Invensys operates in more than 60 countries, with its headquarters in London. For more information, visit www.invensys.com.

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Invensys, Wonderware, ArchestrA, SuiteLink, APV, Avantis, Burco, Dimetronic, Eurotherm, Foxboro, Hansen, IMServ, Lambda, Powerware, Safetran, SimSci-Esscor, Triconex and Westinghouse are trademarks of Invensys plc, its subsidiaries and affiliated companies. All other brands and product names may be the trademarks of their respective owners.