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Caution!
Siemens
Building Technologies
6.3
Signal wiring
The following applies in common for signal wiring of field devices such as
temperature sensors, window switches, presence detectors, dew point sensors or
electrical buttons:
• Use stranded, 2 or multiple core round cables, without screen (standard off-the-
shelf installation cable).
• Single wires or ribbon cables may not be used.
• Signal wiring may be laid together with power lines (AC 230 V).
They must be isolated from the power lines per regulations. Isolation must meet
PELV requirements.
• Signal wiring can not be led in the same cable as the power lines.
• The length must not exceed 300 m (measuring errors, EM interference).
• In case of active sensors with AC 24 V supply, use cable cross section suited for
10 A according to local regulations (T 10A fuse in the power supply module /
room automation station).
6.4
Relay outputs
The following applies for the 230 V wiring:
• The maximum load of the relay contracts must be observed (see data sheets for
the corresponding devices)
• The sizing and fusing of the power lines are oriented to overall connected load
and local regulations.
• The fused electrical values must therefore be reviewed in the data sheets for the
corresponding devices.
• The lines must be secured on the device with strain relief.
• Cable length: as per load and local regulations.
RXM39.1 also has a relay contract (Q14) for switching electrical heating coils (see
data sheet N3836). Observe the following:
• The maximum power is 1.8 kW ohm load. Larger loads close the contact too
much.
• A external fuse of max. 10 A is planned to protect circuits on the PCB of the PL-
Link I/O Block.
TXM1.6RL can switch lighting groups up to 10 A. Fusing max. 16 A.
See data sheet N8177.
Mounting and installation
Wiring of field devices (without bus)
21 / 56
CM111043en_03
2013-02-23
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