100/180 mm PAPERLESS GRAPHIC RECORDER: USER GUIDE
User Guide
Page 35
HA028910
Issue 13 Sep 16
3.4 DISPLAY MODES
The display modes described below allow the currently displayed group’s process values (channels, total-
isers etc.- known collectively as points) to be displayed as vertical, horizontal or circular ‘chart’ traces, as
vertical or horizontal bargraphs or as numeric values. The various display modes are cycled-through us-
ing the up/down arrow keys, or a specifi c mode (or view) can be selected from the Root Menu ‘
Goto View
’
key. Groups can be scrolled through using the left/right arrow keys. The Home key returns the user to the
Home page (defi ned in Confi guration/Views -
section 4.3.4
) from anywhere in the Operator or Confi gura-
tion pages in the recorder. When dispatched, the Home page is Group 1, vertical trend display. See also
the Screen builder description in
section 7
.
TREND HISTORY
Trend history, allows the user to review group history. The maximum amount that can be reviewed
depends on a number of factors, including how many points are confi gured, how rapidly the traces are
changing and so on. At a recording rate of 20 mm/hour (see group confi guration -
section 4.3.2
), with
all channels confi gured, a minimum of 30 day’s worth of traces is available for viewing, provided that the
group contents are not re-confi gured during this period (in which case, the history starts at the end of the
re-confi guration). The amount of trace visible on the screen depends on the recording rate, the higher
the rate, the less trace is visible at any one time.
Notes:
1. Trend history mode is available only for groups with ‘Recording Enable’ enabled (Group con-
fi guration -
section 4.3.2
) and only for vertical, horizontal or circular trend display modes.
2. Trend history mode is vertical for vertical and circular trend modes and horizontal for horizontal
trend mode.
3. Channel cycling is inhibited in trend history mode. To increment the current channel, touch the
faceplate.
4. Group faceplates are not displayed in trend history mode.
5. Operation of the Root/Goto View/Message Log key (
section 3.2.1
), when in history mode, dis-
plays a message log page containing messages which occurred at or near the selected cursor
time.
6. With A/B switching selected, traces are displayed with the ‘A’ or ‘B’ span/zone, colour settings
etc. obtaining at the cursor time. See sections
4.3.2
,
4.3.3
and
4.7,
for more details of A/B
switching.
To enter trend history mode, the option key can be used (as shown for vertical trend mode in fi gure
3.4.1b), or the trace area of the screen can be continuously touched until the screen blanks prior to re-
drawing. A ‘Preparing History, please wait’ message appears whilst the re-drawing calculation is taking
place. Although tracing stops whilst trace history mode is active, no data is lost. Process Variable values
are saved in the recorder memory. Alarms are still scanned-for and any associated action taken.
The trend history display is similar to the real-time trend display, but with a dark background and with the
addition of a slider control and arrow keys for selecting that part of trend history which is to be displayed.
The controls are used as follows:
1 Touching an arrow key key causes the trace history to move an incremental amount.
2 Holding an arrow key continuously, causes continuous movement.
3 Touching and dragging the slider, whilst observing the time/date display, allows the user to select
the section of history exactly. Touching the slider bar either side of the slider causes a page shift in
the relevant direction. The Page up and Page down keys also provide this function.
On fi rst entry to trend history mode, the channel value and the time and date shown in the faceplate
are those at the top edge of the chart. Touching the screen causes a cursor to appear at point of screen
contact. This cursor can be ‘touched and dragged’ to provide a reference point on the current trace.
The displayed value date and time refer to the cursor intersection with the current channel. To return to
real-time trending, the Option key is operated, followed by ‘Exit History’.
