HomeMatic RS485 Installationsanleitung Seite 26

However, we do recommend that at least one sub-
distribution board is always installed on each floor. For
larger buildings it may make more sense to provide se-
veral distribution boards on every floor (a separate one
for each corridor, for example). Accordingly, all load
and control cables must be routed to the correspon-
ding sub-distribution boards in a star configuration.
Power is supplied by the HMW-Sys-PS7-DR DIN rail-
mounted power supply unit or by another 24 V power
supply unit, connected upstream of the surge protec-
tor, that is dimensioned in accordance with the total
number of modules available in the corresponding
sub-distribution board and with the total power con-
sumed by those modules. The individual devices must
be connected downstream of the surge protector.
If programming and control is to be carried out cen-
trally via the HomeMatic central control unit, the HMW
bus cables from the individual sub-distribution boards,
as well as the cable originating from the control PC or
a CCU must converge at a suitable point determined
by the building in question. This enables the individual
bus segments to be kept separate from one another
and facilitates troubleshooting. The point where these
cables converge will usually be in the room where the
HomeMatic central control unit is installed.
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