11 / 14
Siemens
RXM21.1 - PL-Link IO Block
CM2N3835en_01
Building Technologies
07 Mar 2012
Connection diagrams
Connection of field devices, PL-Link and supply
+
M
M
N1
PL-Link IO Block RXM21.1
B1
Temperature sensor LG-Ni 1000
D1, D2
Potential-free contacts (window contact, presence detector, etc.)
Y1, Y2
Thermal valve actuators AC 24 V
Y1.1, Y2.1
Motor-driven valve or damper actuators AC 24 V, 3-point
Y1.2, Y2.2
Electro-mechanic valve actuators AC 24 V, 2-point
Q1 3-speed
fan
Q1.1 1-speed
fan
Twisted
pair
STOP
Note
•
Fans on relay outputs Q14 ... Q34 may not be switched in parallel.
Use isolating relays or separate I/O blocks to run fans parallel.