Quick Start Guide
3
February 2019
1.0 System readiness
1.1 HART Communication
The Rosemount 520 utilizes the HART Communications Protocol. The most
notable advantage of employing HART Communications is that digital
information can be transmitted over legacy 4–20mA analog instrumentation
wiring. In addition to providing device diagnostics and process alerts, the ability
to communicate to the device remotely simplifies basic configuration,
calibration, and maintenance. A task-oriented, user optimized interface
eliminates errors and speeds routine maintenance tasks.
For the Rosemount 520, HART Protocol facilities two basic operation
configurations.
Point-to-point
In this configuration, digital signals are superimposed on the 4–20 mA loop
current. One process variable is sent on the 4–20 mA signal and other secondary
or calculated process variables can be transmitted digitally over the 4–20 mA
signal.
Multidrop
Multidrop refers to the connection of several transmitters to a single
communication transmission line. Communication between the host and the
transmitters occurs digitally with the analog output of the transmitters
deactivated. With HART Revision 7, up to 63 transmitters can be connected on a
single twisted pair of wires. Multidrop installation requires consideration of the
update rate necessary from each transmitter, the combination of transmitter
models, and the length of the transmission line.
For more information, reference “Connect wiring and power up” on page 13.
1.2 Configuration tools
There are several tools that can be used to configure the Rosemount 520.
The Field Communicator is a portable, handheld device used to configure field
devices or perform diagnostics for effective troubleshooting in the field without
having to use a laptop. The Field Communicator supports all HART devices and is
available in an intrinsically safe version.
HART modems allow AMS
™
Device Manager to communicate with HART devices
using a PC serial port, PC USB port, or Bluetooth
®
connectivity. Serial and USB
HART modems attach directly to a PC or laptop computer and do not require an
external power supply. Bluetooth HART modems require a self-contained power
source (AAA batteries) as well as a Bluetooth-ready workstation PC.
HART modems also allow the Rosemount Transmitter Interface Software (RTIS)
to communicate with HART devices using a PC USB or serial port. The RTIS is a
PC-based application that performs configuration and maintenance functions for
the Rosemount 520 Transmitter. The Rosemount 520 is not shipped with the
RTIS; the RTIS can be ordered separately.
00825-0100-4520_RevAC.fm Page 3 Thursday, February 7, 2019 10:16 AM
To Next Page
Loading...
