Emerson manual Physical Specifications Function Blocks, Rosemount 848L, Reference Manual

Rosemount 848L

Reference Manual

00809-0100-4696, Rev AA September 2004

Physical Specifications

Function Blocks

Specification

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

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

A-4