Confirming Error Messages; Communication - Endress+Hauser Proline Promag 55 Operating Instructions Manual

Proline Promag 55
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Endress+Hauser
5.3.3

Confirming error messages

For the sake of plant and process safety, the measuring device can be configured in such a way that
fault messages ($) always have to be rectified and acknowledged locally by pressing F. Only then
do the error messages disappear from the display.
This option can be switched on or off by means of the ACKNOWLEDGE FAULT MESSAGES
function (see the "Description of Device Functions" manual).
Note!
• Fault messages ($) can also be reset and confirmed via the status input.
• Notice messages (!) do not require acknowledgment. Note, however, that they remain visible
until the cause of the error has been rectified.
5.4

Communication

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 → Page 46.
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 ToF Tool - Fieldtool Package), 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:
There are three different command groups:
• Universal commands
All HART device support and use universal commands. The following functionalities, for example,
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 standard.
Amongst other things, such commands access individual field device information, such as
empty-pipe/full-pipe calibration values, low flow cutoff settings, etc.
Note!
The device has access to all three command classes.
List of all "universal commands" and "common practice commands" → Page 63
Operation
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