4
2. OPERATION
Fig 1 shows a simplified block diagram of the
BA488CF-P PROFIBUS display. When the
optional alarms and external switches are not
used, the instrument only requires a two-wire
connection to the fieldbus.
How much of the BA488CF-P PROFIBUS display
configuration can be performed via the fieldbus
depends upon the system host. Parameters that
can not be configured via the fieldbus can be set
using the configuration menu shown in Fig 7 and
the four front panel push buttons.
Fig 1 Simplified block diagram of BA488CF-P
2.1 Controls
The user can scroll through the display screens by
operating the
▼
or
▲
push buttons. The number
of screens available depends upon how the
BA488CF-P PROFIBUS display has been
configured and the number of process variables
that are to be displayed. If one fieldbus variable
per screen has been configured and eight
variables are to be displayed, eight screens will be
present; if two fieldbus variables per screen have
been configured and six variables are to be
displayed, three screens will be available.
If enabled, operating the
P
and
▲
push-buttons
simultaneously activates the Quick Access Menu,
allowing the user to adjust the display contrast
without providing access to any of the other
configuration parameters. Additional security may
be provided by an optional access code.