VEGA VEGAMET 391 With SIL qualification - Manual (Page 16)

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6 Functional safety (SIL)
VEGAMET 391 • With SIL qualification
38704-EN-130228
•
4 … 20 mA sensor input with transmitter power supply
•
Relay outputs 3/4
•
4 … 20 mA current output
Note:
The following inputs/outputs are not permitted for safety-relevant
applications:
•
Digital input 1/2
•
Relay output 1/2
•
Measured value transmission via the communication interfaces
(USB/HART)
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 VEGAMET 391 mit SIL-Qualifikation the DTM
Collection 06/2011 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
parameters must be verified before they are stored in the device. In
normal operating condition, the instrument is also locked against
parameter changes through unauthorized access. This concept is
valid for adjustment directly on the instrument as well as for PACTware
with DTM.
All safety-relevant parameters must be verified after a change and
confirmed by a character string comparison. The following parameters
of the relays 3/4 are judged as safety-relevant:
•
Mode relay output
•
Relay switching point Hi
•
Relay switching point Lo
The parameter settings of the measurement loop must be document-
ed. For this purpose, the document "SIL device settings" is attached
to each instrument already listing all safety-relevant parameters in
the shipping status as well as containing free space for own notes.
This document is also available via the serial number search on our
homepage. In addition, a list of the safety-relevant parameters can be
stored and printed via PACTware/DTM.
Tool for operation and
parameterization
Reliable parameterization
Safety-relevant param-
eters