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Reference Manual
00809-0100-4696, Rev AA
September 2004
Rosemount 848L
A-4
Physical Specifications Environmental Ratings
Electronics (no enclosure)
-40°C to +85°C
99% non-condensing humidity
IP20
Unit (electronics and enclosure)
-40°C to +85°C
100% condensing humidity
IP66
Function Blocks
Specification
H1 Segment Device
Back-up LAS
Resource Block
I/O Transducer Block
All inputs can optionally be latched for the duration necessary for each input
to be read during a macrocycle
Logic Transducer Block (20 Boolean Equations)
The processing cycle of the 848L logic equations from sampling the inputs to
driving the outputs will vary depending upon the number and type of functions
used in the 20 equations. Processing time can vary in the range of 50 to
150ms.
Logic Functions
AND, OR, XOR, NOT
Rising Edge Trigger
Falling Edge Trigger
Turn On Delay
Turn Off Delay
Pulse Counter
Reset
Set Latch
Shift Register Right
Shift Register Left
Function Blocks
8 DI blocks, 4 DO blocks, 1 MDI block,
and 1 MDO block are provided.
Foundation Fieldbus:
• Links 25
•VCR 20