ABB SM3000 User Manual page 18

SM3000
Multipoint Videographic Recorder
16
If an alarm or operator message is obscuring part of a chart trace, use the Chart
Annotation option to hide or display alarms and messages on the screen. Select the
annotation required.  indicates the annotations selected.
The possible combinations are:

No annotation (Alarms and Operator Messages both disabled)

Alarm annotation only

Alarms and Operator Message annotation
Operator Message annotation cannot be enabled unless Alarm annotation is also
enabled.
Note.

If more than 40 icons are present on the screen, chart annotation is disabled
automatically.

When chart annotation is disabled, new operator messages and alarms are still
added to the Alarm Event log – see Section 4.9, page 37.
Note. Applicable only to Circular Chart view in Historical Review mode and is greyed-out
in the menu until 'Historical review' is selected.
Use 'Chart Duration' to change the amount of data displayed on the screen in historical
review mode. A longer chart duration displays more data, a shorter chart duration
displays data over a shorter time period, but in more detail. In both cases, the full trace is
preserved by plotting the maximum and minimum samples for each display point.
Unavailable chart durations are greyed-out.
The chart durations available in the menu are determined by the faster of the primary and
secondary sample rates set for the process group during configuration – see
Section 6.5.1, page 76. Unavailable chart durations are greyed-out.
Table 4.1 on page 17 shows the relationship between sample rate and chart duration for
the Circular Chart view.
Note.

A 'Please Wait' message appears in the status bar while the instrument retrieves
data from storage.

Selecting a different chart duration does not affect the rate at which data is
sampled.

Changing the chart duration causes the time at the cursor position to change.

If the chart duration is changed when in historical review mode, it reverts to that set
during configuration (see Section 6.5.1, page 76) upon exiting historical review
mode.
4 Operation
IM/SM3000–EN Rev. L