Emerson Process Management 2051 manual Rosemount, Reference Manual, 00809-0200-4101,Rev AA July

Reference Manual

00809-0200-4101, Rev AA July 2008

Rosemount 2051

Load Limitations

Maximum loop resistance is determined by the voltage level of the external power supply, as described by:

Table A-1.

Maximum Loop Resistance = 43.5 * (Power Supply Voltage – 10.5)

Load (Ohms)

1387

1000

500Operating

Region

0

10.5 20 30

Voltage (V dc) 42.4

The HART communicator requires a minimum loop resistance of 250Ω for communication.

FOUNDATION™ fieldbus (Output Code F)

Power Supply

External power supply required; transmitters operate on 9.0 to 32.0 V dc transmitter terminal voltage.

Current Draw

17.5 mA for all configurations (including LCD display option)

Turn-On Time

Performance within specifications less than 20.0 sections after power is applied to the transmitter.

FOUNDATION fieldbus Function Block Execution Times

Block	Execution Time
Resource	-
Transducer	-
LCD Block	-
Analog Input 1, 2	30 milliseconds
PID	45 milliseconds
FOUNDATION fieldbus Parameters
Schedule Entries	7 (max.)
Links	20 (max.)
Virtual Communications Relationships	12 (max.)
(VCR)

Standard Function Blocks

Resource Block

•Contains hardware, electronics, and diagnostic information.

Transducer Block

•Contains actual sensor measurement data including the sensor diagnostics and the ability to trim the pressure sensor or recall factory defaults.

A-5