VEGA VEGAMET 391 With SIL qualification - Manual (Page 20)

20
7 Setup with the integrated display and adjustment unit
VEGAMET 391 • With SIL qualification
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guidance. We recommend using the setup assistant for the initial
setup. If later on individual settings should be corrected or added, the
most expedient way to do this is via the classic menus.
As a standard feature, the parameterization of the instrument is
locked to protect it against unauthorized operation. By selecting "Re-
lease operation" and entering a PIN, the instrument is unlocked.
All instrument settings are protected against unauthorized changes.
Execution of the safety functions is ensured only in locked mode.
Modification is thus only possible after releasing the activated lock
and a subsequent verification. The instrument is unlocked by select-
ing "Release operation" and entering a PIN. PIN "0000" is preset but
can be modified by the user.
To ensure the execution of the safety functions, the instruments must
be locked again after the parameter change. All modified, safety-rel-
evant parameters must be verified and a character string comparison
confirmed. Modifications of non safety-relevant parameters are not
shown/verified.
The following parameters of the relays 3 and 4 are classified as
safety-relevant: mode, switching point Hi, switching point Lo.
The following example shows the modification of the mode of relay 3.
The setup assistant leads you step-by-step through the standard set-
tings. The following steps are carried out:
•
Device-TAG (individually adjustable instrument name)
•
Measurement loop TAG (individually adjustable measurement loop
designation)
•
Measured variable (for example level or process pressure)
•
Min./Max. adjustment
•
Activation of the fail safe relay
•
Configuration of the relay outputs (e.g. setup of pump control or
overfill protection)
Release operation
Verify and lock
Setup assistant