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Siemens
RXM21.1 - PL-Link IO Block
CM2N3835en_01
Building Technologies
07 Mar 2012
Up to 2 thermal actuators can be connected directly to a PL-Link I/O-Block. A
power amplifier UA1T is needed in the event of parallel connection of thermal
actuators.
This example also applies to output Y3.
Note load of outputs Y1 and Y3 (max. 9 VA).
Power consumption on input X1 of UA1T: 0,5 VA.
STOP
Note
Mixed operation:
Do not connect thermal actuators to both controller and
power amplifier
.
The valve position otherwise may deviate considerably due to different voltage on
the internal transformer of the controller and on the UA1T power amplifier supply.
1
2
3
4
NS
LS
COM
X1
AC 24 V
Y1.1
Y1.2
3873Z13
Y1
8
7
6
5
COM
Y1
COM
Y1
N2
1
2
3
4
NS
LS
COM
X1
Y1.5
Y1.6
8
7
6
5
COM
Y1
COM
Y1
N2
G G0
Y1.3
Y1.4
Y1.7
Y1.8
N1
L
N
Y1
G
AC 230 V
L N
N1PL-Link IO Block RXM21.1
N2
Power amplifier UA1T (see data sheet CA2N3591)
Y1
Thermal valve actuators AC 24 V connected to controller
Y1.x
Thermal valve actuators AC 24 V (max. 2 actuators STA72E / STP72E per
output Y1 of the UA1T)
•
The UA1T power amplifier requires its own AC 24 V supply!
•
3-point actuators cannot be connected to the UA1T.
Connection of several
thermal valve actuators
Connection to the PL-
Link I/O-Block
Connection to power
amplifier
Notes
