Siemens Desigo PXC4.M16 User manual

Desigo™
Automation stations
PXC4.M16
For the control of primary plants
● Compact automation station for HVAC and building control systems,
freely programmable using graphical programming interface
● Communication BACnet MS/TP (BTL certified)
● Integration of Modbus data points via RTU
● 16 inputs/outputs: 12 universal inputs/outputs, 4 relay outputs
Extendable via I/O modules TXM…
● KNX PL-Link bus to connect RDG2..KN room thermostats, sensors, and operator
units (including bus power)
● Integration of M-bus energy meters via RS485 level-converter
● WLAN interface for engineering and commissioning
● Operating voltage AC or DC24V
● Mounted on standard rails or on the wall
● Plug-in screw terminal blocks
A6V11937668_en--_l Smart Infrastructure
2023-12-22

2
Siemens Schweiz AG A6V11937668_en--_l
Smart Infrastructure 2023-12-22
Functions
Optimized, flexible automation station for HVAC and building automation and control
systems
● System functions (alarming, scheduling, trending, access protection with individually
definable user profiles and categories)
● Integrates data points and/or subsystems via Modbus RTU
● Integration of wired M-bus meters via RS485 level-converter:
– Offline and/or online engineering with ABT Site. No additional M-bus tool required
– Primary and/or secondary device addressing
● The following functions are available with KNX PL-Link bus:
– Communication with RDG2..KN room thermostats, sensors, and operator units
– Plug-and-play connection of Siemens field devices with KNX PL-Link
● Engineering and commissioning with the ABT Site Tool using graphical function charts
● Freely programmable. All function blocks, available in libraries, can be graphically
connected.
● BTL tested BACnet communication on MS/TP, in compliance with the BACnet standard
including B-BC profile (Rev. 1.16)
● IT security including HTTPS, IEC-62443 4-2 (Security Level 2), and BACnet Secure
Connect
● BACnet Secure Connect support as BACnet/SC node
● Generic operation via embedded web interface
● WLAN interface for engineering and commissioning
● Operating voltage AC 24 V or DC 24 V
● Direct connection of field devices
● DIN rail or screw mounting
● Plug-in screw terminal blocks
Type summary
PXC4.M16 variants 1) PXC4.M16S PXC4.M16
Order number S55375-C109 S55375-C101
Number of inputs and outputs (Onboard) 16 16
  Number of universal inputs and outputs (UIO) 12 12
  Number of relay outputs (DO) 4 4
Number of inputs and outputs (Onboard + TXM) up to 40 up to 40
Number of integration data points
(Modbus RTU)
0 up to 40
Total number TXM-I/Os and integration DPs 40 2) 80 2)
Number of KNX PL-Link devices 0 up to 64 2)
Number of configurable RS485 interfaces for Modbus RTU
integration
0 1
Number of M-bus meters wired via level converters (RS485) 3) 0 up to 250
1) For details on engineering, see PXC4, PXC5 & PXC7 Planning overview, A6V13054435.
2) KNX PL-Link data points do not count as integration points. For KNX PL-Link, only the limits on BACnet objects
are considered.
3) The limitation is given by the maximum number of integration data points and maximum number of BACnet
objects.

3
Siemens Schweiz AG A6V11937668_en--_l
Smart Infrastructure 2023-12-22
Onboard inputs and outputs
UIO Universal inputs and outputs support the following signal types:
● Passive sensors LG-Ni 1000, 2x LG-Ni1000, Pt 1000 (375, 385), NTC 10k (Type II / Beta (0-50 °C) =
3892 K), NTC 100k
● Resistance sensors 1000 Ohm, 2500 Ohm, 1000...1175 Ohm (for setpoint shift)
● Voltage input analog DC 0…10 V
● Current measurement analog DC 0...20 mA or 4...20 mA, (inputs U1, U2, U7, U8)
● Binary potential-free contacts for signaling functions
● Counter to 25 Hz (electronic switch to 100 Hz)
● Analog outputs DC 0…10 V
DO Relay outputs for binary controls, changeover contact
(NO, NC, pulse)
Equipment combinations
TXM I/O modules
Description Type 1) Data sheet
Digital input module 8 or 16 I/O points TXM1.8D, TXM1.16D CM2N8172
Universal module without / with local operation and LCD TXM1.8U, TXM1.8U-ML CM2N8173
Super universal module without / with local operation and LCD TXM1.8X, TXM1.8X-ML CM2N8174
Relay module without / with local operation TXM1.6R, TXM1.6R-M CM2N8175
Resistance measuring module (for Pt100 4-wire) TXM1.8P CM2N8176
Triac module TXM1.8T CM2N8179
Digital input and relay module TXM1.4D3R CM2N8188
Power module TXS1.12F10 CM2N8183
Bus connection module TXS1.EF10 CM2N8183
Island bus extension module TXA1.IBE CM2N8184
1) Module series B and higher. In following use cases only series D can be used (available as of 2012):
● I/O bus communication mode "Event"
PXC4 can power TXM extensions modules. For further details see PXC4, PXC5 & PXC7 Planning overview
A6V13054435 and data sheets.

4
Siemens Schweiz AG A6V11937668_en--_l
Smart Infrastructure 2023-12-22
KNX PL-Link devices
Description Type Data sheet
Wall-mounted temperature sensor QMX3.P30 CM2N1602
Wall-mounted temperature and humidity sensor QMX3.P40
Wall-mounted temperature, humidity, and CO2 sensor QMX3.P70
Wall-mounted temperature sensor and room operator unit QMX3.P34
Wall-mounted temperature and humidity sensor and room operator
unit
QMX3.P44
Wall-mounted temperature, humidity, and CO2 sensor and room
operator unit
QMX3.P74
Wall-mounted temperature sensor and room operator unit QMX2.P33 A6V10733768
Wall-mounted temperature and humidity sensor and room operator
unit
QMX2.P43
Flush-mounted room sensors base and front modules:
● Base module for temperature and / or humidity measurement 1)
● Base module for CO2 measurement 1)
● Front module for base module without sensor
● Front module for base module with temperature sensor
● Front module for base module with humidity and temperature
sensor
● Front module for base module with humidity, temperature
sensor, and CO2 indicator LED
● AQR2570
● AQR2576
● AQR2530NNW
● AQR2532NNW
● AQR2535NNW
● AQR2535NNWQ
CE1N1411
Passive infrared presence detector UP 258D12 A6V10489489
Presence detector WIDE with temperature sensor UP 258D31 A6V11894530
Presence detector WIDE with temperature and humidity sensor UP 258D41
Presence detector WIDE with temperature, humidity, and CO2
sensor
UP 258D51
Presence detector WIDE with temperature sensor and ultrasound UP 258D61
Room thermostat with temperature and humidity sensor RDG200KN
RDG260KN
A6V11545853
Room thermostat with temperature, humidity, and CO2 sensor RDG204KN
RDG264KN
1) Physical data points on the base module AQR257.. for use in HVAC functions:
- 2 x Binary potential-free contacts (NO, NC)
- 1 x Passive sensor NTC10K (Type II / Beta (0-50 °C) = 3892 K)
For details see PXC4, PXC5 & PXC7 Planning overview A6V13054435 and data sheets.
System controller
Description Type Data sheet
System controller to integrate Modbus and MS/TP devices PXC5.E003
PXC7
A6V11646020
A6V12505052

5
Siemens Schweiz AG A6V11937668_en--_l
Smart Infrastructure 2023-12-22
Technical and mechanical design
The compact build allows for mounting the devices on a standard rail or a wall.
45 6
15 1413
10 12
1
3
2
7
98 11
16
Date/Series
S/N
WLAN
Default
4 PXC4.M16: Plug-in terminal block with screw
terminals
KNX PL-Link
5 Plug-in terminal block with screw terminals
Power supply
6 Plug-in terminal blocks with screw terminals
Universal inputs/outputs, field device supply
7 Connector for I/O modules TXM
8 Plug-in terminal block with screw terminals
Relay outputs
9 PXC4.M16: Plug-in terminal block with screw
terminals
COM, Modbus RTU
PXC4.M16S: Plug-in terminal block with screw
terminals
MS/TP
10 PXC4.M16: Plug-in terminal block with screw
terminals MS/TP
11 DIP switch for bus termination and polarization
COM, MS/TP
12 Slider for mounting on DIN rails
13 Eyelets for cable ties
1 Plastic housing 14 Holes for wall mounting
2 Service button (identification in network and
WLAN on/off)
15 Date / Series and Serial number
3 LEDs for communication and state 16 QR code for default WLAN access (description
see Technical data)

6
Siemens Schweiz AG A6V11937668_en--_l
Smart Infrastructure 2023-12-22
LED displays
Activity LED Color Activity Function
RUN Green Continuously ON
Continuously OFF
Flashing
Device operational
Device not operational
Start-up or program halted
Red Continuously OFF
Continuously ON
Rapid flashing
OK
HW or SW fault
Firmware or application missing/corrupted
MSTP Yellow Flashing
Continuously OFF
Communication BACnet MS/TP
No communication
COM TX
(PXC4.M16)
Yellow Flashing
Continuously OFF
Communication
No communication to subsystem
COM RX
(PXC4.M16)
Yellow
SVC Red Continuously OFF
Flashing
OK
Device is not configured
Flashing per wink
command
Identification of device after receipt of wink
command
2s 1s
5 Hz 5 Hz
2s 1s
WLAN Blue Steady OFF
Steady ON
Flashing
WLAN inactive
WLAN active and at least one WLAN client
connected
WLAN active and no WLAN client connected
Service button Press 0.2 ... 1 s
Press 1 ... 3 s
Identification in the network
Enable/ disable WLAN
WLAN is disabled automatically after 10min, if
no client is connected
As per description Do the following to reset the device to factory
state:
1. Power off the device.
2. Power on the device.
3. Wait until all LEDs light up and turn off
again, then press the Service button.
4. Keep the Service button pressed until all
LEDs light up, then release the button.
All LEDs go off, the device restarts.
5. Wait until the device has fully started –
unconfigured (green RUN LED and red
SVC LED are flashing)
Product documentation
Related documents such as the environmental declarations, declarations of conformity, etc.,
can be downloaded from the following Internet address:
www.siemens.com/bt/download

7
Siemens Schweiz AG A6V11937668_en--_l
Smart Infrastructure 2023-12-22
Notes
Safety
CAUTION
National safety regulations
Failure to comply with national safety regulations may result in personal injury and property
damage.
● Observe national provisions and comply with the appropriate safety regulations.
Mounting position and ambient temperature
The devices can be snapped onto standard rails or screwed onto a flat surface.
Plug-in screw terminals connect power and interfaces.
Ambient temperature -5...50°C (23...122°F) Ambient temperature -5...45°C (23...113°F)
● Wall, horizontal
– From left to right
– From right to left
● Overhead
● Wall, vertically
– From top to bottom
– From bottom to top
● On a horizontal surface
Installation
WARNING
No internal line protection for supply lines to external consumers
Risk of fire and injury due to short-circuits
● Adapt the line diameters as per local regulations to the rated value of the installed fuse.
WARNING
The relay outputs may be connected to mains voltage
Risk of electric shock! Incorrect installation of the device may lead to electric shock injuries
when touching the device!
● Install the device in a lockable cabinet or use terminal covers.
● Do not install the device in locations where children are likely to be present.
● Conductors with a cross-section of 0.5 mm2 (AWG24) or greater shall comply with the
requirements of IEC 60332-1-2 and IEC 60332-1-3 or IEC TS 60695-11-21.
Disposal
This symbol or any other national label indicate that the product, its
packaging, and, where applicable, any batteries may not be disposed of as
domestic waste. Delete all personal data and dispose of the item(s) at
separate collection and recycling facilities in accordance with local and
national legislation.
For additional details, refer to Siemens information on disposal.

8
Siemens Schweiz AG A6V11937668_en--_l
Smart Infrastructure 2023-12-22
Warranty
The application-specific technical data is guaranteed only in combination with the Siemens
products listed in the 'Device combinations' section. If third-party products are used, any
guarantee provided by Siemens will be invalidated.
Technical data
Power supply
Operating voltage (24 V~, ⏊, ) AC 24V -15 / +20% (PELV)
AC 24V Class 2 (US)
48…63 Hz
Operating voltage DC 24 V (24 V≃, ⏊, ) DC 24V -15 / +20% (PELV)
DC 24V Class 2 (US)
Functional ground(US)
Functional earth
The terminal for the functional ground must be
connected on the installation side with the building
grounding system (PE).
Screw terminals for wire cross sections up to Max. 2.5 mm2 (14 AWG)
Internal fusing 4 A irreversible / non-replaceable
External supply line fusing (EU) Non-renewable fuse max. 10A slow-blow
or
circuit breaker max. 13A
Tripping characteristic B, C, D per EN 60898
or
Power supply with current limitation of max. 10A
Protection Reverse connection protection for DC 24V
Power consumption (for transformer planning)
Operating voltage PXC4.M16S PXC4.M16
AC 24 V DC 24 V AC 24 V DC 24 V
Full load 76 VA / 3.2 A 65 W / 2.7 A 80 VA / 3.3 A 67 W / 2.8 A
Base load
PXC4.M16S: without loading by I/O modules
TXM and field devices
PXC4.M16: without loading by I/O modules
TXM, KNX PL-Link, and field devices
8 VA / 0.33 A 5 W / 0.2 A 8 VA / 0.33 A 5 W / 0.2 A
Field device supply V+ (DC 24 V, 100 mA)
(terminals 8 and 19)
5VA / 0.2A 3 W / 0.13 A 5 VA / 0.2 A 3 W / 0.13 A
Field device supply V≃
(terminals 18 and 29)
48 VA / 2 A 48 W / 2 A 48 VA / 2 A 48 W / 2 A
I/O modules TXM supply 15 VA / 0.6 A 8.5 W / 0.35 A 15 VA / 0.6 A 8.5 W / 0.35 A
KNX PL-Link supply 4 VA / 0.17 A 2.2 W / 0.09 A
Function data
Hardware information PXC4.M16, PXC4.M16S
Processor Texas Instruments AM335x, 300 MHz
Storage 128 MByte RAM
512 MByte Flash
Data backup in the event of power failure
Energy reserve (supercap) to support real-time clock (7 days).
Data available if stored to flash memory. Occurs every 5 minutes.
The interval of 5 minutes is only valid for change log but not for trending.
In case of a power failure, trend log data can be lost up to 30 minutes.

9
Siemens Schweiz AG A6V11937668_en--_l
Smart Infrastructure 2023-12-22
Interfaces
BACnet MS/TP interface
Interface type EIA-485, electrically isolated
Baud rate 9600, 19200, 38400, 76800, 115200 (depending on the
configuration)
Internal bus termination 120 Ohm, switchable with DIP switch
Internal bus polarization 270 Ohm pull-up/pull-down resistances, switchable with
DIP switch
Cabling (in-house cabling only)
Distance between 2 devices
Length of the MS/TP line
3-wire cable, shielded
Max. 500 m (1650 ft)
Max. 1000 m (3300 ft)
Protection Short-circuit proof
Protection against faulty wiring with AC24V and
DC24V
WLAN interface
Interface type Wireless access point
Supported standards
Frequency band
WLAN channels
Maximum radio-frequency power
IEEE 802.11b/g/n
2.4…2.462 GHz
1…11
16.4 dBm
Distance (unobstructed field) Min. 5m (16 ft)
Device pairing Activation / deactivation with service button
Automatic switch off after 10minutes if no WLAN-client
is connected.
Optionally, for cyber security reasons, the WLAN can be
permanently disabled via configuration.
Default SSID and WLAN password: Scan the QR code.
It will display something like WIFI:S:PXC4.M16_0000550;T:WPA;P:1400052738;;
Then SSID = PXC4.M16_0000550 and password = 1400052738
Determine manually: Use the information from the Date/Series/SN block It will display something like:
Date/Series: 20190423A0000550
S/N: 1400052738
SSID = <ASN>_<Running number after the series letter> and password = <S/N>

10
Siemens Schweiz AG A6V11937668_en--_l
Smart Infrastructure 2023-12-22
M-bus interface on COM interface (RS485)
Interface type EIA-485, electrically isolated
Baud rate 300, 600, 1200, 2400, 4800, 9600, 19200, 38400.
The maximum baud rate is depending on the
configuration of M-bus S-devices (subordinate devices)
and M-bus repeater.
Internal bus termination 120 Ohm, switchable with DIP switch
Internal bus polarization 270 Ohm pull-up/pull-down resistances, switchable with
DIP switch
Cabling (in-house cabling only)
Cable length
3-wire cable, shielded cable recommended (shield must
be connected to building earth in the mounting panel)
Max. 1000 m (3300 ft)
Protection Short-circuit proof
Protection against faulty wiring with AC 24 V and
DC24V
M-bus level converter including power supply (required) Configuration examples (simple M-bus loads à 1.5mA):
● Up to 2 M-bus devices: STV Electronic, MPW-2 1
● Up to 6 M-bus devices: STV Electronic, MPW-6 1
● Up to 60 M-bus devices: Relay GmbH, PW60 1
1 For STV Electronic level converters, refer to https://www.stv-electronic.de/. For Relay GmbH level converters,
refer to https://www.relay.de/.
The use of these products is a recommendation only. Siemens cannot guarantee functionality nor take over any
warranty for third-party products. This information is subject to change without notice.
KNX PL-Link interface
Type KNX TP1 PL-Link, galvanic isolation
Baud rate: 9.6 kbps
Cabling (in-house cabling only)
Cable length
2-wire cable, 0.75 mm2 / AWG20
or 1 mm2 / AWG18
With internal supply: Max. 80 m (262 ft)
With external supply: Max. 1000 m (3300 ft)
Internal bus power Max. 50 mA
When using external bus power for KNX PL-Link, switch
off the internal bus power via the ABT Site Tool.
I/O modules TXM bus interface
Nominal voltage DC 24 V
Supply current for I/O modules TXM Max. 300 mA
Connectable in parallel with DC 24 V power supply
module TXS1.12F4
For details, see: TX-I/O- engineering and installation,
CM110562
Protection Short-circuit proof
TXM I/O module plug: No protection against faulty
wiring with AC 24 V
No electric protection.
Use cover

11
Siemens Schweiz AG A6V11937668_en--_l
Smart Infrastructure 2023-12-22
Field device supply (I/O module TXM)
AC 24 V output current (terminal V~ on the TXM
module)
Max. 2A, short-circuit proof 1)
If PXC4.M16 is powered by DC voltage, the field device
supply on terminal V~ of the TXM modules is also DC
voltage.
1) Sum of onboard V~ and TXM module V~ current is max. 2A.
Field device supply (Onboard)
AC 24V output current (terminal V≃) Max. 2A, short-circuit proof 1)
If PXC4.M16 is powered by DC voltage, the field device
supply on terminal V≃ is also DC voltage.
DC 24V output current (terminal V+) Max. 100mA, short-circuit proof, protected against
incorrect wiring with AC 24V
1) Sum of onboard V~ and TXM module V~ current is max. 2A.
Screw terminals, plug-in
Cu-wire or Cu-strand with wire end sleeve 1 x 0.6mm ∅ to 2.5mm2 (22 to 14AWG)
or 2 x 0.6mm ∅ to 1.0mm2 (22 to 18AWG)
Cu-strand without wire end sleeve 1 x 0.6mm ∅ to 2.5mm2 (22 to 14AWG)
or 2 x 0.6mm ∅ to 1.5mm2 (22 to 16AWG)
Stripping length 6...7.5mm (0.24...0.29 in)
Screwdriver Slot screws, screwdriver size 1 with shaft ø = 3 mm
Max. tightening torque 0.6 Nm (0.44 lb ft)
On PXC4.M16
Modbus RTU interface
Interface type EIA-485, electrically isolated
Baud rate 300, 600, 1200, 2400, 4800, 9600, 19200, 38400,
57600, 76800, 115200 (depending on the configuration)
Internal bus termination 120 Ohm, switchable with DIP switch
Internal bus polarization 270 Ohm pull-up/pull-down resistances, switchable with
DIP switch
Cabling (in-house cabling only)
Cable length
3-wire cable, shielded cable recommended (shield must
be connected to building earth in the mounting panel)
Max. 1000 m (3300 ft)
Protection Short-circuit proof
Protection against faulty wiring with AC24V and
DC24V

12
Siemens Schweiz AG A6V11937668_en--_l
Smart Infrastructure 2023-12-22
Inputs
12 universal inputs / outputs U1...U12 with the following input functions (16-bit AD
converter):
Temperature measurement, analog
Type Range (over range) Resolution
AI NTC10K (Type II / Beta (0-50 °C) = 3892 K) -40...115 °C (-52.5...155 °C)
-48...239 °F (-62.5...311 °F)
10 mK (25 °C)
0.018 °F
AI NTC100K -40...125 °C (-52.5...155 °C)
-48...257 °F (-62.5...311 °F)
AI PT1K 385(EU) 1) -50...600 °C (-52.5...610 °C)
-58...1112 °F (-62.5...1130 °F)
20 mK
0.036 °F
AI PT1K 375(NA) 1) -50...180 °C (-52.5...185 °C)
-58...356 °F (-62.5...365 °F)
10 mK
0.018 °F
AI (LG-)Ni10001)
AI 2x (LG-)Ni10001)
1) A fixed value of 1 Ω is calibrated to correct line resistance.
Resistance sensor, analog
Type Range (over range) Resolution
AI 1000 Ohm1) 0...1000 Ω (0...1050 Ω) 0.1 Ω
AI 2500 Ohm1) 0...2500 Ω (0...2650 Ω) 0.1 Ω
AI Pt10001) 0...2500 Ω (0...2650 Ω) 0.1 Ω
AI 1000-1175 Ohm1) for setpoint shift 1000...1175 Ω (900...1295 Ω) 0.1 Ω
1) A fixed value of 1 Ω is calibrated to correct line resistance.
Voltage measurement, analog
Type Range (over range) Resolution
AI 0-10V 0...10V (-1.5...11.5V) 1mV
AI 0-10V standard 0...100% (-10...110%) 0.01%
Open connection: Negative voltage -1.5 V (line failure detection)
Current measurement, analog (only inputs U1, U2, U7, U8)
Type Range (over range) Resolution Load
AI 4-20 mA 4...20 mA (1.6...22.4 mA) 1 µA 440 / 490 Ω
AI 0-20 mA 0...20 mA (-3...23 mA) 1 µA 440 / 490 Ω
Digital input
Contact query voltage 21.5...25V
Contact query current 1mA; 6 mA initial current
Contact resistance for closed contacts Max. 200Ω
Contact resistance for open contacts Min. 50kΩ
Counter memory (counter inputs 0 ... 4.3 x 109 (32-bit counter)
Min. closing/operating time [ms]
including bounces
Of which
Max. bounce time [ms]
Max. counter frequency
(symmetrical)
BI NO / BI NC 60 20
BI Pulse NO 30 10
CI Mech (25Hz) 20 10 25 Hz
CI El (100Hz) 5 0 100 Hz

13
Siemens Schweiz AG A6V11937668_en--_l
Smart Infrastructure 2023-12-22
Outputs
12 universal inputs / outputs U1...U12 with the following output functions (10-bit DA
converter):
Voltage output, analog
Type Range (over range) Resolution Output current
AO 0-10V 0...10V (-0.05…10.6V) 1mV Max. 1mA
AO 0-10V
standard
0...100%
0% = 0V, 100% = 10V
(-0.05...10.6 V)
0.01% Max. 1mA
Relay output (outputs DO1...DO4)
External supply line fusing
Non-renewable fuse
Circuit breakers
Max. 10 A, slow
Max. 13 A, characteristic B, C, D as per EN60898
Switching voltage AC/DC Max. AC 250 V / DC 30 V
Min. AC/DC 12 V
Current load AC NO contact: Max. 4 A resistive, 3 A inductive (cos phi
0.6)
NC contact: max. 2 A resistive, 1.5 A inductive (cos phi
0.6)
Min. 1 mA at AC 250 V
Min. 10 mA at AC 12 V
Current on make AC NO contact: Max. 10A (1s)
NC contact: Max. 3A (1s)
Current load DC NO contact: Max. 3A resistive at DC 30V
NC contact: Max. 1A resistive at DC 30V
Min. 10 mA resistive at DC 12V
Response / release time 7ms / 3ms typical
Contact life at AC 250 V (reference values)
At 0.3 A resistive
NO contact at 3A resistive
NC contact at 2A resistive
Reduction factor for inductive load (cos phi = 0.6)
5 x 105 switching cycles
1 x 105 switching cycles
1 x 105 switching cycles
0.6
Insulating strength between relay contacts and system
electronics (reinforced insulation).
AC 3750V, as per EN 60730-1
CAUTION
No overvoltage protection is used when switching inductive loads
Risk of heavy electromagnetic disturbances and lower contact life when no overvoltage
protection is used when switching inductive loads.
● When switching inductive loads (e.g. contactors or electric motors) it is strongly
recommended to use suitable overvoltage protection devices to avoid heavy
electromagnetic disturbances and to ensure the specified contact life.

14
Siemens Schweiz AG A6V11937668_en--_l
Smart Infrastructure 2023-12-22
Conformity
Ambient conditions and protection classification
Classification as per EN60730
Automatic action
Control function
Pollution degree
Overvoltage category
Type 1
Class A
2
III
Protection against electric shock Suitable for use in protection class I or II systems
Protection degree of housing to EN 60529
Front parts in DIN cut-out
Terminal part
IP30
IP20
Climatic ambient conditions
● Storage / Transport (packaged for transport) as per
IEC EN 60721-3-1 / IEC EN60721‑3‑2
● Operation as per IEC/EN 60721-3-3
● Class 1K22 / 2K12
Temperature -25...70°C (-13...158°F)
Air humidity 5...95% (non-condensing)
● Class 3K23
Operation in enclosed dry locations, having no
temperature or humidity control
Temperature -5...50°C (23...122°F)
(for details see chapter Mounting)
Air humidity 5...95% (non-condensing)
Mechanical ambient conditions
● Transport per IEC/EN 60721-3-2
● Operation as per IEC/EN 60721-3-3
● Class 2M4
● Class 3M11
Standards, directives, and approvals
Product standard IEC/EN 60730-1
Product family standards IEC/EN 63044-x
Electromagnetic compatibility (EMC) For residential, commercial, and industrial environments
EU conformity (CE) See CE declaration 1)
EAC conformity Eurasian compliance
RCM conformity See RCM declaration 1)
UL/cUL certification (US / Canada) UL916, http://ul.com/database
UL94, housing material meets classification V-0 2)
CSA certification C22.2, http://csagroup.org/services-industries/product-
listing
FCC CFR 47 Part 15C
BACnet Profile: B-BC
Revision: 1.16
Detailed information on BACnet certificates, BTL
listings, and PICS can be found on the BACnet website
(filtered for Siemens products)
Environmental compatibility 1) The product environmental declaration 1) contains data
on environmentally compatible product design and
assessments (RoHS compliance, materials
composition, packaging, environmental benefit,
disposal).
OSHPD seismic certification Product meets OSHPD Special Seismic Certification
Preapproval (OSH-0217) under California Building
Code 2022 (CBC 2022)3)
1) Documents can be downloaded at www.siemens.com/bt/download.
2) Material level
3) When installed within the following Siemens enclosures: PXA-ENC18, PXA-ENC19, or PXA-ENC34.
European Union conformity
Contact for regulatory topics: (EU) SiemensAG, Berliner Ring23, DE-76437Rastatt

15
Siemens Schweiz AG A6V11937668_en--_l
Smart Infrastructure 2023-12-22
FCC Statement
This equipment has been tested and found to comply with the limits for a Class B digital
device, pursuant to part 15 of the FCC Rules. These limits are designed to provide
reasonable protection against harmful interference in a residential installation. This
equipment generates, uses and can radiate radio frequency energy and, if not installed and
used in accordance with the instructions, may cause harmful interference to radio
communications. However, there is no guarantee that interference will not occur in a
particular installation. If this equipment does cause harmful interference to radio or television
reception, which can be determined by turning the equipment off and on, the user is
encouraged to try to correct the interference by one or more of the following measures:
● Reorient or relocate the receiving antenna.
● Increase the separation between the equipment and receiver.
● Connect the equipment into an outlet on a circuit different from that to which the receiver
is connected.
● Consult the dealer or an experienced radio/TV technician for help.
This device complies with Part 15 of the FCC rules. Operation is subject to the following two
conditions:
1. This device may not cause harmful interference, and
2. this device must accept any interference received, including interference that may cause
undesired operation
FCC Caution: Changes or modifications not expressly approved by Siemens Switzerland
Ltd. could void user authority to operate the equipment. United States representative
https://new.siemens.com/us/en/products/buildingtechnologies/home.html
Industry Canada statement
This device complies with ISED’s license-exempt RSSs. Operation is subject to the following
two conditions:
1. This device may not cause interference, and
2. This device must accept any interference received, including interference that may cause
undesired operation.
Radiofrequency radiation exposure statement
This equipment complies with FCC and IC radiation exposure limits set forth for an
uncontrolled environment. This equipment should be installed and operated with a minimum
distance of 20cm between the radiator and your body.
This transmitter must not be co-located or operated in conjunction with any other antenna or
transmitter.
Housing
Color top / bottom 2003 Ti-Grey / 804 Black
Dimensions per DIN 43880, see dimensions
Weight without / with packaging 484g / 554g

16
Siemens Schweiz AG A6V11937668_en--_l
Smart Infrastructure 2023-12-22
Connection terminals
65 66 68 69 7067
3 4 5 6 7
8 9
AC/DC 24V
Terminal Symbol Description Module Channel
3, 4 KNX PXC4.M16: KNX PL-Link
5, 6 ≃, ⏊Operating voltage AC 24 V or DC 24 V
7 Functional ground (must be connected on the installation
side with the building grounding system (PE)).
9 to 17
20 to 28
Ux Universal inputs / outputs 1…12 61 1…12
⏊Measuring ground for Ux
8, 19 V+ DC 24V power for field devices 2.4W / 100mA
18, 29 V≃AC 24V power for field devices 48VA / 2A
(If PXC4.M16 is powered by DC voltage, then the field device
supply on terminal V≃ is DC voltage, too)
65, 66, 67 MSTP PXC4.M16: Interface EIA-485 (BACnet MS/TP)
68, 69, 70 COM
MSTP
PXC4.M16: Interface EIA-485 (M-bus, Modbus RTU)
PXC4.M16S: Interface EIA-485 (BACnet MS/TP)
Term on, off Switch for bus termination
Polar on, off Switch for polarization
75 to 86 DOx Relay outputs 1…4 11 1…4
Wiring lines for field devices
Wiring length max. 300 m (1,000ft), CU wire or CU strand.
Cross-section depending on the signal
30m (100ft) applies for signal types AI NTC10K and AI NTC100K
or 300m (984ft) with shielding

17
Siemens Schweiz AG A6V11937668_en--_l
Smart Infrastructure 2023-12-22
Examples of connection diagrams for universal inputs/outputs
Digital inputs
Ux
S1 Feedback contact (NO)
Ux
S2 Feedback contact (NC)
Count inputs: Counter inputs, that count faster than 1 Hz and are laid with more than 10 meters using analog inputs in
the same cable duct, must be shielded.
Analog inputs
Ux
M
B
B1 Temperature sensor LG-Ni 1000
Ux
B2 Temperature sensor, general
Ux
B3 Resistance transmitter
Ux
VV + +
B4 Active sensor with 0…10 V output powered by the
automation station
Ux V+
B5 Active sensor with 0…10 V output with external
power
Do NOT ground external power (ground loops)
Ux
+
V+
B6 Active sensors 0 ... 20 mA or 4 ... 20 mA (2-wire)
On U1, U2, U7, U8 only
Analog outputs
Ux
Y1 Device with input DC 0...10 V
UxUx
VV ++ VV ++
Y2 General device with control input DC 0...10 V
powered by the automation station
Ux V+
Y3 General device with control input DC 0...10 V
Do NOT ground external power (ground loops)

Dimensions
All dimensions in mm and inches.
PXC4.M16
183 (7.20")
198 (7.80")
117 (41.61")
124 (4.88")
4.1 (0.16")
70.5 (2.78")
49 (1.91")
26.5 (1.04")
45 (1.77") 67 (2.64")
110 (4.33")
3 (0.12")
7 (0.28")
PXC4.M16 with TXM module
198 (7.80") 64 (2.52")
90 (3.54")
7 (0.28")
269 (10.59")
Issued by
Siemens Switzerland Ltd
Smart Infrastructure
Global Headquarters
Theilerstrasse 1a
CH-6300 Zug
[phone]
www.siemens.com/buildingtechnologies
© Siemens 2020
Technical specifications and availability subject to change without notice.
Document ID A6V11937668_en--_l
Edition 2023-12-22