User Manual

1. Display
2. Navigation keys (direct access keys and PageUp/PageDown keys):
The direct access keys allow direct access to the relevant line. Possible functions:
– Select value and start the value adjustment
– Confirm new value
– Start function
– Open item
3. Alarm LED: The alarm LED lights up or flashes if an alarm is present in the system.
4. The PageUp and PageDown keys are provided for page scrolling if a page contains more values
than can be shown on the display at the same time.
5. Edit keys: These keys allow the selected values to be modified (<+> and <–>) and confirmed (<↵>).
6. ESC key (Undo and GoUp): When editing a value the editing process can be cancelled by using the
Undo key (previous value will be displayed again). Otherwise the GoUp key selects the hierarchically
higher object.
This key is placed between the two blocks containing the navigation and editing keys because,
according to its function, it belongs to both.
7. <?> Info key: This key selects the information mode for the next keyboard click.
Depending on to the application program each menu tree is different. Navigation
through the menu tree is based on the "ClickDown" procedure using the navigation
keys.
If the PXM20-E receives an alarm or an event appears on the display a pop-op window
appears with the relevant information.
When an alarm is present the alarm LED flashes and changes to steady light when all
alarms have been acknowledged. The acoustic alarm is provided as an option and can
be activated optionally when an alarm is triggered.
Alarms are written into the Alarm Viewer with a symbol, a description and a time/date
stamp in chronological order. An acknowledgement mask to acknowledge alarms can
be called up in the Alarm Viewer . After acknowledgement the alarm entry disappears
from the Alarm Viewer ; however, it will continue to be saved in the history list. Further
details can be viewed in the alarm history (e.g. out of service, overridden, dead band,
present value, etc.)
The PXM20-E history can contain max. 50 entries; the older ones are deleted.
The Scheduler allows the user a time-dependent switch on/off and the programming of
time-dependent setpoint adjustments.
The Scheduler consists of a 7-day schedule and an exception program.
With the help of the navigation and editing
keys it is very simple to create, modify, delete
or copy a 7-day schedule in this mask. For
each day an individual "road map" is
programmed.
If the field EXCEPTION OVERVIEW is clicked
in the 7-day schedule (see above) the current
monthly overview appears and shows as
inverted all the days which are affected by an
exception. All other months can be called up
as overview by using the top direct access
key.
Generic operation and
display
Alarms and events
Visual and acoustic
alarm
Alarm Viewer
Scheduler
7-day schedule
Exception programs
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Siemens Operator unit PXM20-E CM1N9234en_4
Building Technologies 2015-01-06