9
Rosemount 848T Family
November 2014
www.rosemount.com
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.
Software upgrade in the field
Software for the Rosemount 848T with FOUNDATION fieldbus is
easy to upgrade in the field using the FOUNDATION fieldbus
Common Device Software Download procedure.
FOUNDATION fieldbus parameters
Physical specifications
Conformance to specifications (±3σ [Sigma])
Technology leadership, advanced manufacturing techniques,
and statistical process control ensure specification conformance
to at least ±3
σ.
Mounting
The Rosemount 848T can be mounted directly onto a DIN rail or
it can be ordered with an optional junction box. When using the
optional junction box, the transmitter can be mounted onto a
panel or a 2-in. pipe stand (with option code B6).
Entries for optional junction box
No entry
Used for custom fittings
Cable gland
9 x M20 nickel-plated brass glands for 7.5–11.9 mm
unarmored cable
Conduit
5 plugged 0.86-in. diameter holes suitable for installing
1
/2-in.
NPT fittings
Materials of construction for optional junction
box
Weight
Environmental ratings
Type 4X and IP66 with optional junction box. JX3
Explosion-proof enclosure rated to -4 °F (-20 °C).
Function blocks
Analog Input (AI)
Processes the measurement and makes it available on the
fieldbus segment.
Allows filtering, alarming, and engineering unit changes.
Input Selector (ISEL)
Used to select between inputs and generate an output using
specific selection strategies such as minimum, maximum,
midpoint, or average temperature.
Since the temperature value always contains the
measurement status, this block allows the selection to be
restricted to the first “good” measurement.
Multiple Analog Input Block (MAI)
The MAI block allows the eight AI blocks to be multiplexed
together so they serve as one function block on the H1
segment, resulting in greater network efficiency.
Schedule Entries 20
Links 30
Virtual Communications Relationships (VCR) 20
Junction box type Paint
Aluminum Epoxy Resin
Plastic N/A
Stainless Steel N/A
Aluminum Explosion-proof N/A
Assembly
Weight
oz lb kg
Rosemount 848T only 7.5 .47 .208
Aluminum
(1)
(1) Add 35.2 oz (2.2 lb, 0.998 kg) for nickel-plated brass glands.
78.2 4.89 2.22
Plastic
(1)
58.1 3.68 1.65
Stainless Steel
(1)
77.0 4.81 2.18
Aluminum Explosion-proof 557 34.8 15.5
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