WHA-GW-*
Configuration
221981 2011-07
54
5.4.3 Burst Lists
Burst mode is a special communication mode in which a HART slave device sends
responses to a particular HART command without being polled by the master. Normally, a
HART slave device only responds when being polled by the master.
When burst mode is used, a HART slave device can publish data (for example process
values) independently in regular time intervals. Alternatively, data can be published if the
value has changed by a significant amount, has reached a certain threshold level or has
not been updated within a default reporting time.
The gateway maintains a burst message list comprising, for each sub device, the specific
commands currently being published within the WirelessHART network. The burst list is
volatile and therefore reset after power-up or network restart.
Device publishing guidelines
• It is recommended that command 48 (Read Additional Device Status) is always
published to ensure caching of the related status information. A publishing interval of
approx. 1 minute is generally the best choice. When configuring WirelessHART
adapters, command 48 allows proper identification and management of a sub-device list
change without direct Host intervention.
• Publishing of at least one command should always be enabled at the wireless device
level to allow configuration change detection and automatic device cache invalidation
without direct Host intervention.
Status Wireless communication status of the device.
: OK, device connected and identified.
: No communication possible.
: Communication possible, device not identified.
Manufacturer Manufacturer of the selected device.
Analogue Value Analogue value of the selected device's primary variable.
PV Primary variable of the selected device.
SV Secondary variable of the selected device.
TV Tertiary variable of the selected device.
QV Quaternary variable of the selected device.
Table 5.4Network Explorer – Instrument List
Displayed
information
Description
Note!
It is important to consider the following publishing guidelines for each device in the wireless
network. Only if publishing of at least one command is activated in each wireless device,
the gateway is able to cache up-to-date device status information, even if no other HOST
activity is ongoing. Up-to-date data is important for efficient device status monitoring.
You will find the publishing parameters of most WirelessHART devices in the "Burst Mode"
menu of the device DTM.
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