VEGA VEGAFLEX 86 4 … 20 mA_HART two-wire Coax probe With SIL qualification - Manual (Page 29)

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6 Functional safety (SIL)
VEGAFLEX 86 • 4 … 20 mA/HART two-wire
44231-EN-130823
•
4 … 20 mA current output
6.4 Safety concept of the parameterization
The following tools are permitted for parameterization of the safety
function:
•
The integrated display and adjustment unit for on-site adjustment
•
The DTM suitable for the signal conditioning instrument in con-
junction with an adjustment software according to the FDT/DTM
standard, e. g. PACTware
Note:
For operation of the VEGAFLEX 86 the DTM Collection version 1.67.2
or higher is required. The modification of safety-relevant parameters is
only possible with active connection to the instrument (online mode).
To avoid possible errors during parameterization in a non-safe user
environment, a verification procedure is used that makes it possible
to detect parameterization errors reliably. For this, safety-relevant pa-
rameters must be verified after they are stored in the device. In normal
operating condition, the instrument is also locked against parameter
changes through unauthorized access. This concept applies to the
adjustment on the instrument but also to adjustment with PACTware
with DTM.
For protection against unwanted or unauthorzed adjustment, the set
parameters must be barred from unauthorized access. For this rea-
son, the instrument is shipped in locked condition. The PIN in delivery
status is "0000".
When shipped with a specific parameter adjustment, the instruments
are accompanied by a list with the values deviating from the basic set-
ting. By entering the serial number, the list is available as a download
under "www.vega.com/VEGA-Tools".
All safety-relevant parameters must be verified after a change.
The parameter settings of the measurement loop must be document-
ed. You can find a list of all safety-relevant paramters in the shipping
status in chapter "Setup with the display and adjustment module"
under "Additional settings - Reset". In addition, a list of the safety-
relevant parameters can be stored and printed via PACTware/DTM.
For each parameter change, the instrument must be unlocked via a
PIN (see chapter "Setup steps - Lock adjustment"). The device status
is indicated by the symbol of an unlocked or locked padlock.
In delivery status, the PIN is 0000.
Warning:
If adjustment is enabled, the safety function must be considered
as unreliable. This applies until the parameterization is terminated
correctly. If necessary, other measures must be taken to maintain the
safety function.
Tool for operation and
parameterization
Reliable parameterization
Safety-relevant param-
eters
Release adjustment
Unsafe device
status