Bosch PLN-6TMW Service Manual download pdf (Page 9)

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.

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Bosch PLN-6TMW Service Manual Page 9

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