VEGA VEGAMET 391 With SIL qualification - Manual (Page 17)

17
6 Functional safety (SIL)
VEGAMET 391 • With SIL qualification
38704-EN-130228
For each parameter change, the instrument must be unlocked via a
PIN (see chapter "Setup steps - Release adjustment"). The device
status is indicated via the symbol of an unlocked or locked padlock.
Warning:
If the instrument is unlocked, the safety function must be classified as
unsafe. This applies until the parameterization is terminated correctly.
If necessary, other measures must be taken to maintain the safety
function.
All parameters changed by the operator are marked automatically so
that they can verified in the next step.
For the verification the PIN must be entered first and a comparison of
two character strings must be carried out. The user must confirm that
both character strings are identical, this is used to check the charac-
ter representation and the communication channels. The verification
texts are provided in German and with all other menu languages in
English.
In a second step, all modified, safety-relevant parameters are listed,
which must all be confirmed. After this process is finished, the instru-
ment will be locked automatically and the safety function is guaran-
teed again.
Warning:
If the described process was not carried out completely or correctly
(e.g. interruption or voltage loss), the instrument remains in unsafe
and unlocked status.
Warning:
In case of a reset to basic settings, all safety-relevant parameters will
also be reset to default. Therefore all safety-relevant parameters must
be checked or readjusted.
Unlock instrument
Unsafe device
status
Change parameter
Verify parameter/Unlock
instrument
Incomplete process
Instrument reset