Siemens FDFB291 Montage page 5

en
FDnet/C-NET: Use of unshielded cables
See connection diagram in Fig. 5.
The connection is established from base to base using
twisted or non-twisted wire pairs.
FDnet/C-NET: Use of shielded cables
See connection diagram in Fig. 6.
The detector line shielding must be connected in the
detector base with auxiliary terminals DBZ1190-xx.
There are two ways of connecting external alarm
indicators:
Variant A
1. Connect the positive pole of the external alarm
indicator to the positive pole for the external alarm
indicator on the detector.
2. Connect the negative pole of the external alarm
indicator to the negative pole for the external alarm
indicator on the detector.
3. Connect the shielding of the connection cable between
the external alarm indicator and detector on the
detector side to the positive pole for the external alarm
indicator via an auxiliary terminal DBZ1190-xx.
Variant B
1. Connect the positive pole of the external alarm
indicator to the positive pole for the external alarm
indicator on the detector.
2. Leave the negative pole for the external alarm indicator
on the detector unoccupied.
3. Connect each of the two negative poles of the external
alarm indicator separately to both negative poles of the
detector line.
The two negative connections of the external alarm
indicator are decoupled externally in the alarm
indicator by diodes.
4. Connect the shielding of the detector line with the
shielding of the connection cable to the external alarm
indicator with an auxiliary terminal DBZ1190-xx.
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Connection to a collective detector line
Connect a control panel-specific end-of-line to the end of
the collective detector line.
Collective: Use of unshielded cables
See connection diagram in Fig. 7.
The connection is established from base to base using
twisted or non-twisted wire pairs.
Standard circuitry
With standard circuitry, the external alarm indicator is
connected to the positive and negative poles of each
detector.
Wire-saving circuitry
Wire-saving circuitry in external alarm indicators is
prohibited for new sites.
With wire-saving circuitry, the external alarm indicator is
connected as follows:
The external alarm indicator must be connected to the

positive and negative poles of at least one detector (A).
The external alarm indicator must be connected to the

positive pole of every other detector (B).
The external alarm indicator need not be connected to

the negative pole of each other detector (C).
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04.2010