PROline Promag 50 5 Operation
Endress+Hauser 65
5.4 Communication (HART)
In addition to local operation, the measuring device can be configured and measured
values can be obtained by means of the HART protocol. Digital communication takes
place using the 4–20 mA current output HART (see Page 55).
The HART protocol allows the transfer of measuring and device data between the HART
master and the field devices for configuration and diagnostics purposes. The HART
master, e.g. a handheld terminal or PC-based operating programs (such as FieldTool),
require device description (DD) files which are used to access all the information in a
HART device.
Information is exclusively transferred using so-called “commands”. There are three
different command groups:
Universal commands:
All HART device support and use universal commands. The following functionalities are
linked to them:
• Identify HART devices
• Reading digital measured values (volume flow, totalizer, etc.)
Common practice commands:
Common practice commands offer functions which are supported and can be executed
by most but not all field devices.
Device-specific commands:
These commands allow access to device-specific functions which are not HART stand-
ard. Such commands access individual field device information, amongst other things,
such as empty/full pipe calibration values, low flow cutoff settings, etc.
!
Note!
Promag 50 has access to all three command classes. On Page 67, you will find a list
with all the supported “Universal Commands” and “Common Practice Commands”.
5.4.1 Operating options
For the complete operation of the field device, including device-specific commands,
there are Device Description (DD) files available to the user to provide the following
operating aids and programs:
HART Communicator DXR 375
Selecting device functions with a HART Communicator is a process involving a number
of menu levels and a special HART function matrix. The HART Communicator manual
contains more detailed information on the device.
FieldTool operating program
FieldTool is a universal service and configuration software package designed for
the PROline field devices. Connection is by means of a HART-Modem, e.g. Commubox
FXA 191.
The functionality of FieldTool includes the following:
• Configuration of device functions
• Visualization of measuring values (including data logging)
• Data backup of device parameters
• Advanced device diagnosis
• Measuring-point documentation
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