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PL-Link bus
Communication signal
PL-Link bus cable
Note
Bus power supply
Max. number of devices
Siemens
Building Technologies
9.5
Technical data PL-Link
Transmission medium (bus cable)
Baud rate
Bus line polarity
Bus terminating resistor
The communication signal (information) is transferred symmetrically, i.e., as
voltage difference between the two bus lines (and not as a voltage difference to the
earthing potential). The sign preceding the voltage between PL+ and PL–
determines signal values 0 and 1.
Cable type
Wire diameter
Line resistance
Specific capacity
Specific inductivity
Screens
PXC3 devices do not have a connection for bus cable screens
Internal bus power from room automation station PXC3
160 mA from the internal bus power supply is sufficient for max. 32 PL-Link devices
with 5 mA each.
If the consumption is more than 160 mA (more than 32 devices or more than 5 mA
per device), one or two external bus power supplies are required.
In this case the internal bus power supply must be disabled via ABT, as parallel
operation of the internal supply with external supplies is not admissible.
64 devices in a PL-Link network.
Mounting and installation
PL-Link room bus
TP (twisted pair)
9.6 kbps
(fixed for TP)
PL+, PL–
(not interchangeable)
Not required
2-wire, stranded (
one wire pair)
or 2x2-wire, stranded
or spiral quad
Min. 0.8 mm (AWG20)
Max. 1.0 mm (AWG18)
20 ... 75 Ω/km
10 ...100 nF/km at 10 kHz
450 ...850 µH/km at 10 kHz
Not required
DC 30 V, 160 mA
CM111043en_03
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2013-02-23
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