Bosch Security Systems | 2006-05 | 9922 141 50741 en
Plena Weekly Timer
| Installation and User Instructions | Equipment
en
| 9
3
Equipment
3.1 Introduction
The Plena Weekly Timer (which is perfectly suited for
connecting to the Plena Message Manager and Voice
Alarm System) is an accurate timer for use in public
address systems. It is ideal for schools, shopping malls
and all other venues, where regularly timed messages,
signals or other controls (such as the automatic locking
and unlocking of doors) are required.
The Timer can be programmed from:
•
the controls on the front panel.
•
a PC which has the Plena Weekly Timer
Configuration software installed.
If the Timer is programmed using the configuration
software, a USB cable is required to connect the PC to
the Timer.
The Timer has two weekly schedules that can be
individually programmed. Each day of the week has a
separate event set, which means that two separate
schedules can be programmed for any one day. Events
can be programmed to an accuracy of one minute, and
there is no limit to the number of events.
See figure 3.1 (on the next page) for a schematic
overview of the Plena Weekly Timer.
Any single event can consist of:
•
one of 14 pre-programmed chimes (which are
broadcast via the audio throughput).
•
adjusting (or switching off) of the Back Ground
Music (BGM) - attenuation.
•
any combination of output contacts that have
internal relays for connecting to numerous types of
equipment. There are 6 output contacts in total.
The output contacts can be set to: open, close, or
generate a pulse.
Pulse duration can be globally programmed, and
chimes shorter than one minute can be set to repeat a
number of times in the general system settings.
However, these options are only available if the Plena
Weekly Timer Configuration software is being used.
The intuitive front panel allows users to easily switch
between the two programmable schedules. The
programmable output contacts can also be manually
activated, allowing for random events to take place; for
example, if a door lock has to be suddenly opened
(before the scheduled time), the user can push one of
the 6 output contact buttons on the front panel of the
unit. The Timer will re-lock the door as programmed
during the next applicable event.
A pause button also allows users to temporarily suspend
all events, with the exception of the clock display, while
pressing and holding the rotary selector allows the user
to lock all controls of the front panel. This safety feature
prevents unscheduled events from being accidently
activated.
The Timer has an audio input and output (cinch and
XLR) for attenuating BGM signals (see figure 3.1). The
volume can be directly controlled from the front panel,
or programmed to lower at set times. The Timer will
then automatically select the programmed volume at the
start of the next event.
This allows users to automatically adjust the background
music to suit the time of day; for example, music can be
automatically attenuated in the morning or evening
hours, or BGM can only be allowed at certain times of
the day.
The Timer has a clock sync. input for synchronizing the
time with an external source; the correct time can also
be downloaded from a PC. This allows the Timer to be
synchronized with a time server. The Timer clock also
keeps track of the date, ensuring for the correct display
of weekdays, and automatic Summer/ Winter time
(daylight saving time) settings (according to European,
North American, user defined dates).
The Timer has a 24V backup power input with reverse-
polarity protection, as well as a backup battery that
preserves the correct clock setting. Synchronization is
done via the USB port. There is an RS-232 connector
on the back panel for connecting the Timer to a large
separate display.
