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5.2
PROCESS VARIABLE DISPLAY
As discussed above, the operator interface consists of a display screen and associated push buttons. The
display screen shows process variables in one of a number of formats, or operational details (notes or alarm
history for example), or configuration details for use in setting up the recorder to produce the required displays
and history formats. The remainder of this section discusses the process variable displays, alarm displays and
so on; configuration details are to be found in Section 6.
Note: Some of the items below can be selected for use only by users with a suitable permission
level as set up in the 'Instrument' 'Security' menu described in Section 6.1.6.
Figure 8 depicts a typical trend display and gives details of the various areas of the display page.
Current point name
Current point 'pen'
Instrument name
Recording status
Figure 8 shows a vertical trend page. Operating the Raise/Lower push-buttons allows the user to scroll through
the other display modes: Horizontal trend, Vertical bargraph, horizontal bargraph, numeric, vertical trend, and
so on. All these display modes are described in Section 5.4, below.
A display mode can also be selected from the Top level menu 'Go To View' item which appears when the 'Page'
key
is operated.
The scroll button can be used to scroll through the points in the group, overriding the 'Faceplate Cycling' on or
off selection
5.2.1 Alarm Icons
Note 1: A full discussion of alarms is given in the Channel Configuration section of this manual,
Note 2: Trigger alarms do not display threshold marks or bars, or faceplate symbols.
The alarm icons shown below appear in some display modes. The icons on a channel faceplate show the status
of that channel's alarm(s), as follows:
Icon is flashing
Icon steadily illuminated
Alarm thresholds and deviation alarm bars appear for horizontal and vertical trend modes. For deviation bars,
the bar stretches from (Reference - Deviation) to (Reference + Deviation). Vertical and Horizontal bargraph
modes display only absolute alarm symbols.
A
September 18
Channel 1
Inst name
Figure 8 Typical display screen (Vertical trend)
Section 6.4.3.
alarm is active but unacknowledged or it is an Auto alarm which is no longer active
but which has not been acknowledged.
the alarm is active and has been acknowledged.
FEC920: USER GUIDE
6.23
A5E45696052A Rev-AA
V
Current point value and units
Current point scale
Time/date stamps
12:01:08
Current time/date
Page 17
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