VEGA PLICSCOM - Manual (Page 22)

22
5 Setup - Sensors up to software 3.99
PLICSCOM •
36433-EN-130228
Current output
Characteristics 4 … 20 mA
20 … 4 mA
Failure mode 4) Hold value
20.5 mA
22 mA
< 3.6 mA
Min. current 5) 3.8 mA
4 mA
Max. current 6) 20 mA
20.5 mA
The values in bold font represent the data of the factory setting.
In HART multidrop mode, the current is constantly 4 mA. This value
does not change even in case of failure.
Current output
Characteristic: 4-20 mA
▼
Failure mode: 22 mA
▼
Min. current 3.8 mA
▼
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 output of the
measured value as 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. 7)
In this menu item you determine the HART mode and enter the ad-
dress for multidrop.
Service/Functional safety
(SIL)
Service/HART mode
4) Value of the current output in case of failure, e.g. if no valid measured value is
delivered.
5) This value is not underrun during operation.
6) This value is not exceeded during operation.