Philips Plena LBB 1965/00 Installation And User Instructions Manual page 48

MESSAGE MANAGER
Play-back messages
When an announcement is started via a trigger contact, the corresponding trigger indicator LED (8) will light up. Single-
shot triggering and repeating mode is provided. After pressing a trigger switch the announcement is played completely.
If the trigger switch is still ON upon completion of the announcement, this announcement will be repeated until the
trigger switch is released. Then it will complete the running announcement and stop.
Within an announcement there is no possibility for repetition loops of individual messages. However the same message
may be programmed in the sequence more than once (max. 4).
Trigger inputs have serial priority, i.e. input 1 has priority over trigger input 2, 2 over 3, etc.
When an announcement is overridden with an announcement with a higher priority, the first indicator LED will extinguish
and the new LED will light up. Lower priority triggers will be ignored.
The LED of the running message is flashing (2 Hz). If the current announcement is interrupted via RS232 by a higher
priority call from the connected system pre-amplifier, the LED will stop flashing and light up continuously.
The front panel of the unit contains six pushbuttons (9) to activate announcements 7 to 12, effectively in parallel with
the trigger inputs 7 to 12.
If the unit is connected to the LBB1925 via RS232, trigger inputs 1 through 6 will be processed with a priority equal to
the high-priority setting of a connected LBB1946 call station. Trigger inputs 7 through 12 are processed with a priority
equal to the low-priority setting of a connected LBB1946 call station.
This priority level affects only the priority of the announcements compared to other sources connected to the system
pre-amplifier, e.g. call stations. It does not affect the priority between the trigger inputs of the message manager, which
is serial.
If a repeating announcement is interrupted by a higher priority call via the system pre-amplifier LBB1925 or by a higher
priority trigger input (lower contact number) and if, after the interruption, the original trigger input is still active, this
announcement will start again from the beginning. Non-repeating single-shot announcements are just cancelled without
finishing.
Monitoring
The message manager comprises a 6.3 mm headphone output socket (2) with a momentary monitor pushbutton (3).
When the unit is not active it is possible to select messages for monitoring. Note that memory supervision (checksum) is
disabled during monitoring.
If during monitoring any trigger input contact for starting an announcement is made, the monitoring process is cancelled
immediately and the normal play-back mode is resumed.
To select messages for monitoring simply press the momentary monitor pushbutton. A single push starts message #1. If
the pushbutton remains pressed, message #2 will be played automatically upon completion of message #1, #3 after #2,
etc., up to and including the last available message. Then it stops.
If during play-back of a message the monitor pushbutton is repeatedly pressed, the next message is started without
finishing the previous one. During this monitoring process the corresponding message indicator LEDs are flashing.
Running messages, triggered manually or started via the trigger contacts, can be heard on the monitor headphone as
well. There is no monitor volume control.
Supervision
In conformity with the major standards for emergency sound systems like IEC 60849, the following features of the
message manager are or can be supervised:
- Content of the message memory. The micro controller adds a checksum to the messages. This supervision
requires no user intervention. If no messages are played the processor will read out the complete audio
memory to compare its content to the checksum, automatically and continuously within a 100 s cycle.
- Availability of any message in the audio memory.
- Presence of mains supply.
- Trigger contacts and involved wiring of trigger inputs 1 to 6 (see also page 30).
- Resetting of the internal processors by the 'watchdog' circuitry. The processors have a watchdog circuit to
reset the processor if the normal program flow is halted or deviated from.
- Supervision of the DAC using a 1 Hz pilot tone.
- Supervision of audio connections using a 20 kHz pilot tone.
If during supervision a fault is pointed out, the fault indicator LED (6) will light up and the internal fault relay, which is
normally activated when the power supply is connected and the unit is ON, will be switched to its unpowered state.
Potential free fault contacts (SPDT) and potential free message active relay contacts are provided at the rear of the unit.
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