NIST Demonstration Overview


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General Demonstration Overview

View the Overall Demonstration Architecture

View a Picture of the Demonstration Hardware

NIST Demonstration Contacts and Acknowledgements


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Demonstration Overview/Purpose

The NIST Coolant Control Java Applet provides a venue for demonstrating the integration of several important areas of research and standardization efforts that are taking place within the Smart Transducer community, at NIST, and at the IEEE. These efforts culminate into an important emerging family of standards: IEEE P1451, Standard for a Smart Transducer Interface. The demonstration illustrates two of the current working group efforts: 1451.2 and P1451.1 in an interesting Internet-based exhibition of there capabilities.

The demonstration graphically describes a closed loop control system that regulates the temperature of machine tool coolant. This system allows the operator to control the temperature of the coolant to a consistent temperature for long running machine tool processes; thus enabling more exacting parts to be manufactured. In additon, the Applet allows the operator to control and query the control system for key information about its state. Many of the additional operator commands were added to illustrate the variety of useful information that the standardization process has defined. Many of these commands would be valuable options for remote control and monitoring aspects of diagnostic tuning, maintenance, and recovery mechanisms. Therefore, the demonstration not only provides a real world application in use on the Internet, it more importantly illustrates the integration and use of these two newly emerging standards. An important result of this demonstration provides the remote capabilities that would be useful for todays deployment of Internet based enterprise-level operator stations.

Physically, the demonstration consists of two Hewlett-Packard (HP) HP-IE Ethernet-based nodes. The nodes provide an embedded platform for direct connection to the Ethernet. Using transducer interface standards based on IEEE 1451.2 the nodes integrate the two temperature sensors and one valve actuator into the Ethernet control network environment. The distributed control loop applications used on the nodes were developed here at NIST using the HP Node application development kit.

This kit provides a Windows NT hosted platform for building the C language embedded applications for distributed control. Once the applications are downloaded to the nodes they are capable of being controlled and manipulated through the Java-based Internet client. The Java client when executed connects with an experimental TCP/IP communications gateway that was developed here at NIST. The gateway allows the Java clients to communicate with the nodes as if they were directly connected. The HP-IE node communication services uses a publish/subscribe messaging paradigm to distribute information between nodes. Therefore, the gateway acts as a publish and subscribe server intermediary for the Java clients. Conceptually, the Java clients believe they are communicating directly with the nodes; in fact, the surrogate gateway is forwarding information on there behalf as well as providing Internet callbacks to the clients when information arrives destined for them.

The gateway executes on a Windows NT Server platform along with the Microsoft Internet Information Server (IIS) Web Site. This is required to get around certain security issues with Java and network connections.

More to come....


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The NIST Demonstration Topology

Demonstration Topology


The demonstration topology illustrated above essentially allows remote control of IEEE P1451.2 nodes via the Internet. The actual transducers are connected to a Hewlett Packard (HP) HP-IE Ethernet-based control network located at the NIST facility in Gaithersburg, Maryland. A NIST developed software gateway is used to access the HP-IE control network from the Internet. This attachment allows the demonstration to remotely access, control, and display specific IEEE P1451.2 sensor/actuator information using a standards-based Internet infrastructure.


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NIST Demonstration Hardware Information

Demonstration Hardware Looking inside the cabinet at NIST, the ISA Demonstration peripherals including: the HP Ethernet Nodes (top), the temperature sensors and valve actuator terminal blocks (center), an EDC STIM, a 4-port Ethernet Hub (bottom), and various power connectors (left).

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NIST Demonstration Contacts and Acknowledgements


The software for this demonstration including: the Web Site, the video integration, the Java applet, the embedded HP-IE Node application software and the Windows NT based TCP/IP Gateway software was developed here at NIST by Rick Schneeman. The hardware portion of this demonstration was developed, built and installed by Bob Gavin.

For more information about IEEE P1451, please contact Kang Lee the P1451 Chairperson at NIST by email at Kang.Lee@nist.gov, or by phone at 301-975-6604.

For more information about this demonstration and ongoing IEEE 1451 technology research at NIST, please contact Rick Schneeman.