42
6 Set up with the display and adjustment module PLICSCOM
VEGAPULS 66 • 4 … 20 mA/HART - two-wire
28438-EN-170927
•
Italiano
•
Netherlands
•
Japanese
•
Chinese
Language
German
The functional safety is already activated Ex factory for instruments
with SIL qualification. For instruments Ex factory without SIL qualifica-
tion, the functional safety must be activated by the user for applica-
tions according to SIL via the indicating and adjustment module. The
SIL factory setting cannot be deactivated by the user.
The activation of SIL has the following impact:
•
In the menu item "
Failure mode
" under "
Current output
", the
parameters "
Hold value
" and "
20.5 mA
" are blocked
•
In the menu item "
HART mode
", the function "
Multidrop
" is blocked
Note:
For such applications, it is absolutely necessary to take note of
"
Safety Manual
".
HART offers standard and multidrop mode.
The mode "standard" with the fixed address 0 means outputting the
measured value as a 4 … 20 mA signal.
In Multidrop mode, up to 15 sensors can be operated on one two-wire
cable. An address between 1 and 15 must be assigned to each sen-
sor.
8)
In this menu item you determine the HART mode and enter the ad-
dress for multidrop.
HART mode
Standard
Address 0
The default setting is standard with address 0.
This function enables reading out parameter adjustment data as well
as writing parameter adjustment data into the sensor via the display
and adjustment module. A description of the function is available in
the operating instructions manual "
Display and adjustment module
".
The following data are read out or written with this function:
•
Measured value presentation
•
Adjustment
•
Medium
Service - SIL
Service - HART mode
Copy sensor data
8)
The 4 … 20 mA signal of the sensor is switched off. The sensor uses a
constant current of 4 mA. The measuring signal is transmitted exclusively as
a digital HART signal.
