User Manual

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Siemens RXM39.1 - PL-Link I/O Block CM2N3836en_06
Building Technologies 2016-05-19
Engineering notes
Installation manual TRA, CM111043, contains all information required to engineer
the KNX PL-Link bus (topology, repeater, etc.)
• The PL-Link I/O Block is operated on AC 230 V power. The device directly
supplies power to actuators (valves, dampers). As a result, no separate AC 24 V
supply is required for the field devices.
• The sizing and fusing of the power lines are oriented to overall load and local
regulations.
• Supply circuits are interrupted as soon as plug 19/21 is removed from the device.
(Bridges 19-19 and 21-21 are located on the print, not the plug; see terminal
diagram page 11).
• The power lines must be fused on the device with strain relief.
• The potential-free relay outputs allow for switching loads
– Up to AC 250 V, 10 A (1.8 kW) (Q14, electric heating release).
– Up to AC 250 V, 5 A (4 A) (Q34, fan release).
• The sizing and fusing of the power lines are oriented to overall connected load
and local regulations. The switching circuits must be externally fused (≤ 10 A);
no internal fusing.
• The lines must be fused on the device with strain relief.
STOP
Caution!
• Electric heaters MUST be equipped with a seperate safety thermostat
• The DC 0 … 10 V outputs YC1, YC2 supply max 1.5 mA.
• The AC 24 V output G (next to YC2) supplies max. 6 VA.
• The DC 0 … 10 V output YC3 supplies max 1.5 mA.
• The outputs are inactive
• The device is in Backup mode
• After a timeout (2 x heartbeat time) the outputs go to Backup value
• The field devices (valve and damper actuators are supplied directly by the PL-
Link I/O Block). Separate AC 24 V supply is required only if the field devices
consume more than 6 VA.
• Active sensors and actuators with AC 24 V supply: The admissible cable length
is calculated based on a max. voltage drop of 7% (1.68 V) of the AC 24 V supply
voltage at the sensor/actuator.
• Active sensors and actuators with A/DC 24 V supply: The admissible cable
length is calculated based on a max. voltage drop of 1% (0.24 V) for actors and
0.5% for active sensors..
See the notes on active sensors and actors in the TRA installation guide,
CM111043.
For time critical functions as light and blinds, use KNX PL-Link pushbuttons.
D1..D4 are not suitable for these purposes because of the low sampling rate.
Power lines
AC 230 V
Potential-free
relay outputs
AC 230 V
DC 0...10 V outputs
– Actuators
– Fan control
Behavior without a pro
-
cess value (power
-on,
missing
KNX PL-Link
communication
AC 24 V supply for field
devices (G)
Cable length for field
devices with
AC/DC 24 V supply
Digital inputs