KROHNE BM 100 HART - Manual (Page 6)

BM100 Remote Operation - HC 275 / AMS
Dev.-Rev. EE, DD-Rev. 03
© 2000 KROHNE Meßtechnik D-47058 Duisburg Page 6
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As compared with HC275 or PC-Star configuration tools, the BM100/AMS application has one
additional function, being the HART® Common-Practice Apply values method. The latter
assigns to the PV Upper/Lower Range Values the magnitude of the applied process.
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Adjustment of the thresholds/gains (instrument’s functions 1.5.1, 1.5.4, Ser. 1.2.2) in the online
mode is possible only from methods (Level threshold/gain, Interface level threshold/gain,
Reference threshold/gain). Such solution was caused by the two reasons: the threshold values
are involved into bus transactions in internal instrument units (not engineering ones) and data
types; the threshold value that is advised for the user (i.e. should appear in the edit control)
depends both on the instrument’s dynamic and static data. To preserve for the user the
possibility to control these variables in the offline mode, the reconcile displays’ set is augmented
(as compared with configuration ones) by one tab, having the “Application” label.
Correspondingly, the “Service” reconcile tab is augmented by reference-related
thresholds/gains.
CAUTION: While changing thresholds’ values in the offline mode, refer to the online help for
every variable.
4.3 Known AMS (1.4.x) Shortcomings
There are several problems found during trials with AMS. They are all reported to FRSI and will
probably have gone since the AMS release 1.5.
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User Configurations View. When the user configuration is created (via drag & drop technology)
from either connected instrument or the Plant Database, not all configuration parameters (even
of the maintenance class) are transferred. The variables that cannot be obtained in the user
configuration, are the so-called conditional enumerators, if they depend on the instrument
identification data (delivered with Universal Command #0).
Say, allowed settings for ‘Range I 1’ and ‘Range I 2’ variables (enumerators) depend on the
instrument hardware version. As result, selection lists for both these variables will be empty in
the user „Configuration Properties“ tabs.
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Losing of the “Service Code”. If after registration as specialist (refer to section 4.2), the user
does not open the “Configuration Properties” or “Process Variables” window, AMS will lose
soon access to service functionality (i.e. the correct service code), and the user will have to
undertake the same actions (4.2) to re-establish access rights. In case if any window is already
open before the “Service Code” method is invoked, such loss doesn’t happen.