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Reference Manual
00809-0100-4697, Rev EA
October 2011
Rosemount 848T
A-2
Transient Protection
The transient protector (option code T1) helps to prevent damage to the
transmitter from transients induced on the loop wiring by lightning, welding,
heavy electrical equipment, or switch gears. This option is installed at the
factory for the Rosemount 848T and is not intended for field installation.
Update Time
Approximately 1.5 seconds to read all 8 inputs.
Humidity Limits
0–99% non-condensing relative humidity
Turn-on Time
Performance within specifications is achieved in less than 30 seconds after
power is applied to the transmitter.
Alarms
The AI and ISEL function blocks allow the user to configure the alarms to
HI-HI, HI, LO, or LO-LO with a variety of priority levels and hysteresis settings.
Backup Link Active Scheduler (LAS)
The transmitter is classified as a device link master, which means it can
function as a Link Active Scheduler (LAS) if the current link master device fails
or is removed from the segment.
The host or other configuration tool is used to download the schedule for the
application to the link master device. In the absence of a primary link master,
the transmitter will claim the LAS and provide permanent control for the H1
segment.
F
OUNDATION fieldbus Parameters
Schedule Entries 20
Links 30
Virtual Communications Relationships (VCR) 20