HomeMatic HMW-Sen-SC-12-FM Installation And Operating Manual page 27

The inputs are only suitable for connecting
floating switch contacts.
Do not connect the inputs to a 230 V mains
voltage.
Connect the switch contacts from GND to the rele-
vant input (S1, etc.).
The maximum cable length between the
switch contact and the module will differ, de-
pending on the type of cable used. However,
a length of 50 m should not be exceeded.
The bus and the power supply are connected via
plug-in terminals, each with 2 connections per
contact, so additional wiring can be applied here.
The plug-in terminals are suitable for cable cores
from 0.12 to 0.5 mm
means that straightforward cabling can also be
carried out using rigid telecommunications or CAT
installation cables.
(AWG 26 to AWG 20). This
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