Siemens RXM21.1 User manual

CM2N3835en_01
07 Mar 2012 Building Technologies
s
3835
3835P01
Desigo TRA
PL-Link IO Block RXM21.1
Use with PXC3 series room automation station
•The PL-Link I/O block contains the inputs and outputs controlled by a
room automation station via PL-Link.
•PL-Link communications
•Valve control (3 potential-free relay contacts)
•Thermal valve actuator control (AC 24 V)
•Motor-driven valve and damper actuators
(AC 24 V, 2- or 3-point)
•Temperature input LG-Ni 1000
•2 digital inputs
•Operating voltage AC 230 V
•Pluggable screw terminals
Use
The RXM21.1 PL-Link I/O-Block allows control of a single fancoil unit by a PXC3
room automation station via the PL-Link peripheral bus. It is optimized for fancoil
installation and control in terms of housing, connection terminals and I/O mix. The
PL-Link (PeripheraL-Link) is a two-wire bus system optimized for communication
between peripheral devices (sensors, actors) and the modular PXC3 room
automation stations in the domains or HVAC, lighting and shading.

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Functions
The application on the room automation station determines the device functionality.
Type overview and ordering
The device is supplied without terminal covers.
Terminal covers (RXZ20.1) can be ordered optionally.
Equipment combinations
•The PL-Link I/O-Block RXM21.1 only works together with PXC3 series room
automation stations.
•LG-Ni 1000 temperature sensors can be connected.
•AC 24 V actors from Siemens or third party can be connected.
•Signaling inputs relay outputs etc. see pages 10, 11.
Technical design
The PL-Link I/O-Block RXM21.1 consists of a terminal base, upper section of
housing, and circuit board with plug-in connection terminals on the side. In addition,
the device offers a tool socket, a service LED and button.
Plug-in connection
terminals
Upper housing section
Plug-in connection
terminals
3835Z01
Lugs for cable strain relief
Plug-in connection terminal
for PL-Link bus
Housing base
Service LED
Service button
Tool socket
The Service LED (3-color) indicates the device's operating status as follows:
Continuously OFF •No power supply
•Nothing to indicate.
Flashing 1 (1/4 s On, 7/4 s Off) •Feedback for medium button pressure
(yellow)
•Feedback during process (yellow)
Flashing 2 (1s On, 1 s Off) No device detection (red)
Continuously ON •Programming mode (red)
•Success (green)
Product number Stock number Name
RXM21.1 S55376-C104 PL-Link IO Block
Note
Service LED

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The device carries out the following commands from the service button:
Button pressure Action
Short (< 0.5 s) •Switch on/off programming mode
•Do not indicate connection test result
(0.5...2.s) •No action
Medium
(2...20 s)
•Start connection test
Long (> 20 s) •Start reset to factory settings
Operation and display interaction:
Short Medium Long
Indication time *)
Button pressure
Indication / success
Failure
Status Programming mode Connection test Reset
Result Factory settings
*) Indication time = 60 s; can be ended by briefly pressing the button.
Warning!
Only trained electrical installation staff may press the service button when the
terminal cover is removed!
Adjacent terminal may be powered.
The device is supplied without terminal covers protecting the connection terminals
against touch and soiling. The service LED is visible also with installed terminal
cover. The service button is pressed using a tool. Remove the cable entry glands
to connect cables to the room automation station.
3873J02
Remove terminal cover
Service button
HMI concept
Terminal cover

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ID-number
(Unique serial number)
Barcode for ID, Code 128
Protective category
Temperature range
(0 ... 50 °C)
Test date, series
(Z, A, B, C ...)
Serial number
Observe notes in this document
All connection terminals are plug-in terminals. The terminals are separated to
prevent faulty wiring for terminals connected to AC 230 V (supply, relay outputs).
STOP Note
Warning!
Cable strain relief for lines for terminals 19 ... 28
(AC230 V) is mandatory. Attach the lines to the
related lugs on the housing base using cable
blinders (see picture, right).
Plug-in terminals connected to power must be
removed from power prior to plug-in or plug-out!
3873J04
The PL-Link I/O-Block RXM21.1 contains the following interfaces:
•PL-Link terminals.
•RJ45 tool plug for FW upgrade (proprietary, a Siemens connection cable is
required).
Warning! •Only trained electrical installation staff may connect the tool plug (RJ45)!
Adjacent terminal may be powered.
•Do not connect Ethernet to the RJ45 plug! The device at the other end might be
destroyed!
Disposal
"The device is considered electronics device for disposal in terms of European
Directive 2002/96/EG (WEEE) and may not be disposed of as domestic garbage.
The device must be disposed of via the proper channels.
Follow all local and currently applicable laws and regulations.
Label
Connection terminals
Communication

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Engineering notes
Installation manual TRA, CM111043, contains all information required to engineer
the 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, 5 A
(4 A).
•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 cables must be attached to the device with strain relief.
STOP Caution! •Do not connect fans in parallel.
Outputs Y1 ... Y4 may not exceed 9 VA simultaneous load.
Y1, Y2 (heating) 3-position valve actuator 4.5 VA
Y3, Y4 (cooling) 3-position valve actuator 4.5 VA
Max. load for heating and cooling sequence is 9 VA each.
This is allowed because both sequences are not active simultaneously.
STOP Note With small loads (< 2 VA), tolerance may be > +20% (see technical data).
Application Thermal
actuators
Motorized
actuators
Elktromechanical
actuators.
Outout 1 Y1 Y1
Y2
Y1
Outout 2 Y3 Y3
Y4
Y3
•The outputs are inactive
•The device is in Backup mode
•After a timeout (2 x heartbeat time) the outputs go to Backup value
Power lines
AC 230 V
Potential-free
relay outputs
AC 230 V
Triac outputs AC 24 V
Max. load
Example:
Assignment of outputs
Behavior without a pro-
cess value (power-on,
missing PL-Link
communication

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Mounting notes
The PL-Link I/O-Block can be mounted in any position using the following
attachment methods:
3873J06
3873J07
Mounting on tophat rail
The housing base contains a snap-on
option to mount on tophat DIN rails, type
EN50022-35x7,5 (snap off using
screwdriver)
Direct mounting
Two predrilled holes to mount using screws
(drilling diagram, see "Dimensions").
The housing base has higher support surfaces.
Screws: Max. dia. 3.5 mm, length min. 38 mm
STOP Note
Tightening torque for fastening screws: Max. 1.5 Nm
Observe the following for mounting:
•Heat generated during operation must be removed; make sure the air circulates
sufficiently around the device.
•Easy access for service.
•Comply with local installation regulations!
The mounting instructions including drilling template is printed on the device
packing.
Commissioning notes
Outputs are inactive (relay off, triac off) when an application does not use an output.
The outputs can be controlled and the inputs queried as part of a special test mode
(SSA tool).
3-position actuators: No synchronization is executed when the sense of rotation is
changed.
STOP
Caution!
•The thermal fuse in the transformer may be triggered in case of extended
overload (ca. 4 minutes) or short circuits.
The device must then be replaced.
•The AC 24 V side does not have protection against faulty wiring on AC 230 V.
•AC 230 V mains power for supply and relay must be switched off prior to
plugging in and removing plug-in terminals (risk of electric shock!)
•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).
Secure state
Functional test

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Operating notes
•When power is off, all outputs are inactive
•When PL-Link communications fails, all outputs go to the configured backup
values (after 2 x Heartbeat time).
Technical data
Power Rated voltage AC 230 V
Frequency 50 / 60 Hz
Power consumption incl. connected field
devices
Max. 12 VA
Internal fuse Thermal, irreversible
Protection Protection against faulty wiring on AC 230 V No protection for On / outputs
Inputs
Status inputs (D1, D2) Quantity 2
(for potential-free contacts) Contact voltage. DC 16 V
Contact current DC 5 mA
Contact transfer resistance Max. 100 Ohm
Contact insulation resistance Min. 50 kOhm
Switching time: Min. 20 ms “ON”, min. 20 ms “OFF”
Heartbeat 1 s
Protection against faulty wiring on AC 24 V Protected
Measured value input B1 Connectable temperature sensor LG-Ni 1000
Quantity 1
Measuring range 0...50 °C
Sensor current 0.5 mA
Resolution 0. 1 K
Measuring error at 25 °C sensor temp.
(without line resistance)
Max. 0.5 K
Heartbeat 10 s
Protection against faulty wiring on AC 24 V Protected
Outputs
Triac outputs AC 24 V Quantity 4 (Y1 ... Y4)
Output voltage AC 24 V +/- 20%
(at <2 VA load: possibly >+20%!)
Outputs Y1...Y4 are on AC 24 V, the triac closes against contact to G
Output current Max. 0.5 A
Total rated load
(at simultaneous load on 2 outputs)
Max. 9 VA
Protection against overload No protection

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Relay outputs Quantity 3 (Q14, Q24, Q34)
Relay type Monostable, NO contact
Contact rating at alternating current
Switching voltage Max. AC 250 V, min. AC 19 V
Rated current resistive / inductive Max. AC 5 A / 4 A (cosϕ= 0.6)
Switch-on current (200 ms half-time) Max. 20 A
Switching current at AC 19 V Min. AC 10 mA
Contact rating at direct current
Switching voltage Max. DC 250 V, min. DC 5 V
Switching current at DC 5 V Min. DC 100 mA
Switching output Max. 20 W
Inductive load L/R Max. 7 ms
Locking (in firmware) •Only 1 relay active at a time
•All relays 1 s OFF upon change of
stage
PL-Link bus Interface type Galvanically isolated
Transceiver TP-UART
Bus power 5 mA
Baud rate 9.6 kbps
Protection against faulty wiring AC 24 V Proteced
Bus topology: See installation guide TRA, CM111043
Line connections Connection terminals for signals and power
supply (plug-in screw terminals)
Solid or stranded
0,25 ... 2.5 mm2 or 2 x 1.5 mm2
Connection terminals for PL-Link bus (plug-
in screw terminals)
Solid or stranded wire 2 x max 1.0
mm2
e.g. YCYM 2x2x0.8
Cable length See TRA installation manual,
CM111043
Tool connection cable Max. 3 m
Degree of protection of
housing
Protection as per EN 60529 IP30 with terminal cover and wall
mounting without tophat rail
IP20 for all other mounting types
Protection class Suited for use in Protection class I – or Protection class II - Plants
Environmental conditions Operation Class 3K5 as per IEC 60721-3-3
Temperature 0 ... 50 °C
Humidity < 85% r.h.
Transport Class 2K3 as per IEC 60721-3-2
Temperature – 25 ... 70 °C
Humidity < 95% r.h.

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Standards and directives Product safety
Automatic electronic controllers for
household use and similar applications
EN 60730-1
Electromagnetic compatibility
Immunity (industry & residential) EN 60730-1
Emissions (residential) EN 60730-1
CE compliance
Electromagnetic compatibility as per
directive
2004/108/EC
Low voltage directive 2006/95/EC
UL approbation UL916
C-tick conformity (EMC) AS/NZS 61000-6-3
Environmental compatibility The product environmental declaration
CA2E3871 contains data on environ-
mentally compatible product design and
assessments (RoHS compliance,
materials composition, packaging,
environmental benefit, disposal)
ISO 14001 (environment)
ISO 9001 (quality)
SN 36350 (environmentally compatible
products)
2002/95/EC (RoHS)
Dimensions Refer to “Dimensions”
Weight With/without packaging 0.640 kg / 0.675 kg

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Connection terminals
3835A01
123456789101112 1718
M D1 GND D2 Y1 G Y2 B1
PL-Link
T
M
25 26 27 28
Q13 Q14
AC 230V
Y3 G Y4
M
Q24 Q34
AC 230V 5(4)A
19 19 21
N L N
21
L
–
+
N.C.
Measured value input B1 1 Measured value input for LG-Ni 1000 sensor
M 2 Ground for measured value input
Status inputs D1 4 Status input
GND 5
Ground for status inputs
D2 6 Status input
Triac outputs Y1 7 Switching output AC 24 V, 0.5 A
G 8 Actuator supply AC 24 V
Y2 9 Switching output AC 24 V, 0.5 A
Y3 10 Switching output AC 24 V, 0.5 A
G 11 Actuator supply AC 24 V
Y4 12 Switching output AC 24 V, 0.5 A
PL-Link + 17 Data line +
– 18 Data line –
Power N
19 Neutral conductor
L 21 Phase conductor AC 230 V +/- 10%
Relay outputs Q13 25 Common supply for Q14, Q24 and Q34
Q14 26 NO contact AC max. 250 V, 5 (4) A (stage 1)
Q24 27 NO contact AC max. 250 V, 5 (4) A (stage 2)
Q34 28 NO contact AC max. 250 V, 5 (4) A (stage 3)
M and GND are galvanically connected
•Note the technical data for the relay outputs: AC max. 250 V, 5 (4) A
•Comply with local installation regulations!
1
3206Z01
2345678
1 PL-Link +
2 PL-Link –
3 Unused
4 Unused
5 +12VDC
6 RxD
7 TxD
8 GND
Note
Caution!
Tool connection socket
Proprietary socket,
type RJ45

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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.

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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
GG0
Y1.3
Y1.4
Y1.7
Y1.8
N1
L
N
Y1
G
AC 230 V
LN
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

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Dimensions
Without terminal covers
62 1
3,9
35,3
133,2
3873M14
3,3 4,4
With terminal covers
RXZ20.1
(to be ordered separately)
62 1
3,9
35,3
167
112,4
107,8
51,5
5
3873M15
All dimensions in mm

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86,3
43,2
78
39
3873M16
3,6
Drilling diagram 1:1
2012 Siemens Switzerland Ltd Sub
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ect to chan
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