Image 1 - Menu Comparison
In addition, the enhancements allow a device developer to describe not only the device features, but also soft-tools that will allow the user and host to better analyze the digital information coming from the device. The tools include new calculation capabilities, support for images, the presentation of tabular data, real-time data logging and the storing and display of historical information on each device.
And, real-time data logging of information (signal strength versus level, temperature and flow variations over time), is just the beginning. See Image 2.
Image 2
The EDDL enhancements also allow device manufacturers to present historical data against current readings. This allows users to track things like valve wear using valve signatures or to resolve echo curves for radar level gauges. The host stores historical data in a file defined by the DD, , and then the data is presented to the user on an x-y graph allowing a comparison of the original data to the new data. With this information users can decide when to do preventive maintenance on a device based on actual data versus cycle time or event.
Enhancements to the technology allow HART users to bridge the gap between traditional analog devices and smart digital devices using intelligent field communications. This bridging provides a continuous forward migration path with no user investment loss. This migration path is vital to cost-conscious companies that work with continuous processes.
Because HART devices support two simultaneous communication channels on the same wire (4-20mA “current loop” analog and HART digital), HART Communication is the logical migration path for the millions of legacy systems still in use. All HART-enabled instruments produce or accept a 4-20mA analog control signal compatible with systems produced over the past 30 years. No loss of investment occurs when upgrading using the HART / EDDL path.
The expected growth rate for HART Communication coupled with the recent enhancements to the Electronic Device Description Language assures users that they will continue to maximize their investment in HART technology for many years to come.
Finding a place to begin integration of HART data is the key to future improvements in process performance. When control systems use only the 4-20mA analog communication channel, an “information gap” exists. Continuous real-time HART communication closes that information gap by providing a two-way exchange of process information.
Integrating HART Communication with plant systems is easy and cost-effective. Get started today. Close the information gap and “See What You Can Do” when you use the “Power of HART”.
Want to know more about how to use HART technology? Join the HART Users Group! And watch for upcoming HART Connection articles that will provide information on applying HART technology, application notes to help you implement new HART strategies and what to expect from a HART-enabled device or host system. For more information, contact the HART Communication Foundation or go to http://www.hartcomm.org.