A central element of the updated software is the integrated Stale Values and Substitution Values. These parameters enable you to quickly react to a failure and to precisely evaluate possible solutions for application specific errors.
The Stale Value displays the age of a submitted value. This can be a dynamic variable and the status information of a connected field device. Every last burst message the WirelessHART gateway receives from the field is assigned a time stamp. This allows it to calculate a percentage value from the burst period for every temporarily saved value. Once the gateway receives a new value from the field device, the count restarts.
Individually defined warning levels (e.g. 150% burst period) or error levels (e.g. 300% burst period) trigger alarms when a burst message has exceeded its update cycle. Color-coded notifications allow you to quickly identify whether the measured value is not older than 100% (green), temporary communication problems exist (orange), or you are facing a complete communication breakdown (red).
To tackle these failures, a substitution value can be determined for each HART variable. These Substitution Values can either be the last measured value, “NaN” (“Not a number”), “upscale =0x7F7FFFFF”, or “downscale 0xFF7FFFFF”. Furthermore, a definition of individual Substitution Values is possible as well. This allows you a situational and quick error diagnosis.