Number Item Description
4 HI/LO frequency control for
inputs 5‑6
A recessed rotary control with a center detent to adjust the high and
low frequencies of Microphone 5‑6 signals. Remove the insert for
access to the control. Control range:
– LO = 100 Hz ± 8 dB
– HI = 10 kHz ± 8 dB
5 Music level control A rotary control to adjust the level of the selected music source.
6 HI/LO control for music
inputs 1‑3
A recessed rotary control with a center detent to adjust the high and
low frequency of the selected music source. Remove the insert for
access to the control. Control range:
– LO = 100 Hz ± 8 dB
– HI = 10 kHz ± 8 dB
7 Music source selector and
indicators
Press the Selector button repeatedly to select sequentially between the
internal music source (SD/USB/tuner) and one of the three music
inputs on the rear panel. A green LED shows the source selected.
When a PLN-4S6Z Wall Panel is connected and enabled to have control,
the Remote LED is ON. Pressing the Selector button will then first
disable the Wall Panel before switching to the next music input. With
the Selector button the internal music player can be selected with and
without Wall Panel control. For the other music inputs, control by the
Wall Panel must be enabled from the Wall Panel itself.
8 Master volume control A rotary control to adjust the overall output signal of the unit.
– The master volume control has no effect on the volume of the
PLN-6CS Call Station and on the volume of the Telephone/
Emergency signal. The PLN-6CS has its own volume setting that
must be set for best intelligibility. The Telephone/Emergency input
also has its own volume setting (48).
– The volume level of all other inputs is controlled by the master
volume control of either the All-in-One Unit or the Wall Panel.
9 Power LED The green power LED indicates power on.
10 Fault LED The Fault LED lights up amber to indicate that the pilot tone detecting
circuit has not found a pilot tone at the output of the internal or
external amplifier. This will only occur when the unit is in supervisory
mode, see item (25) in All-in-One Unit configuration, page 21.
Note: The Plena All‑in‑One System is not certified for voice alarm
purposes. When there is no special reason to supervise the built-in or
external amplifier, it is recommended to switch off supervision to
reduce the power consumption of the device.
11 All (zones) switch and
indicator
When the All switch is pressed, all zones are switched on and all output
zone LEDs light up
12 LED VU meter Indicates the output signal level. Accuracy is between +0 / -3 dB, where:
– 0 dB = red
– -6 dB = amber
– -20 dB = amber
– Power on = green
30 en | Operation Plena All-in-One System
2014.09 | V1.2 | Installation and Operating Manual Bosch Security Systems B.V.
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