Service; 4-20 Ma Hart (Output Code A); Foundation Fieldbus (Output Code F); A.2.2 Service - Emerson Rosemount 2051 Reference Manual

Reference Manual
00809-0300-4101, Rev BB

A.2.2 Service

Liquid, gas, and vapor applications
A.2.3 4–20 mA HART (output code A)
Power supply
External power supply required. Standard transmitter
operates on 10.5 to 42.4 Vdc with no load.
Load limitations
Maximum loop resistance is determined by the voltage
level of the external power supply, as described by:
Max. Loop Resistance = 43.5 (Power Supply Voltage – 10.5)
1387
1000
Operating
500
Region
0
30
10.5 20
Voltage (Vdc)
Communication requires a minimumloop resistance of 250 ohms.
1. For CSA approval, power supply must not exceed 42.4 V.
Indication
Optional two line LOI/LCD display
Zero and span adjustment requirements
Zero and span values can be set anywhere within the range
limits stated in Table A-1 and
Span must be greater than or equal to the minimum span
stated in Table A-1 and Table
Output
Two-wire 4–20mA, user selectable for linear or square root
output. Digital process variable superimposed on 4–20 mA
signal, available to any host that conforms to HART
Protocol.
Rosemount 2051
Digital communications based on HART Revision 5
Protocol.
Specifications and Reference Data
(1)
42.4
Table A-2.
A-2.
Specifications and Reference Data
Rosemount2051 with Selectable HART
The Rosemount 2051 with Selectable HART comes with
Selectable HART Revisions. Digital communications based
on HART Revision 5 (default) or Revision 7 (option code
HR7) Protocol can be selected. The HART revision can be
switched in the field using any HART based configuration
tool or the optional LOI.
LOI
The LOI utilizes a two-button menu with internal and
external configuration buttons. Internal buttons are always
configured for LOI. External buttons can be configured for
either LOI, (option code M4), analog zero and span (option
code D4) or digital zero trim (option code DZ). See
Rosemount 2051 with Selectable HART
for LOI configuration menu.
A.2.4 F Fieldbus (output code F)
OUNDATION
Power supply
External power supply required; transmitters operate on 9.0
to 32.0 Vdc transmitter terminal voltage for non-I.S.
applications, 9.0 to 30 Vdc for entity model intrinsically safe
applications and 9.0 to 17.5 Vdc for FISCO intrinsically safe
applications.
Current draw
17.5 mA for all configurations (including LCD display
option)
Indication
Optional two-line LCD display
F Fieldbus function block
OUNDATION
Execution times
Block
Resource
Transducer
LCD display block
Analog input 1, 2
PID
Arithmetic
Input selection
Signal characterizer
Integrator
Output splitter
Control selector
November 2016
Reference Manual
Execution time
N/A
N/A
N/A
20 milliseconds
25 milliseconds
20 milliseconds
20 milliseconds
20 milliseconds
20 milliseconds
20 milliseconds
20 milliseconds
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