Siemens Desigo PXC4.M16 User manual

A6V11937668_en--_b
Smart Infrastructure
2020-07-10
Desigo™
Automation station
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
●16 inputs/outputs: 12 universal inputs/outputs, 4 relay outputs
Extendable to 40 inputs/outputs via I/O modules TXM…
●Integration of Modbus data points via RTU
●WLAN interface for engineering and commissioning
●Operating voltage AC 24 V
●Mounted on standard rails or on the wall
●Plug-in screw terminal blocks

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Functions
Automation station for HVAC and building control systems.
●System functions (alarming, scheduling, trending, access protection with individually
definable user profiles and categories)
●Freely programmable (close resemblance to CEN standard 11312). All function blocks,
available in libraries, can be graphically connected.
●Engineering and commissioning with the ABT Site Tool using graphical function charts
●BACnet communication, in compliance with the BACnet standard including B-BC profile
(Rev. 1.15)
●Generic object viewer for device local data points via an embedded web-based interface
●Wireless connection for engineering and commissioning
●Integration of Modbus data points via RTU
●Direct connection of field devices
Type summary
Type
Order number
Description
PXC4.M16
S55375-C101
Compact automation station for BACnet MS/TP
Inputs/outputs
Total number of inputs/outputs (Onboard)
16
Number of universal inputs/outputs (UIO)
12
Number of relay outputs (DO)
4
Number of inputs/outputs (Onboard + TXM)
40
Number of Modbus data points RTU
40
UIO
Universal inputs/outputs support the following signal types:
●Passive sensors LG-Ni 1000, 2x LG-Ni1000, Pt 1000 (*75, 385), NTC 10k, NTC 100k
●Resistance sensors 1000 Ohm, 2500 Ohm, 2650 Ohm, 1000...1175 Ohm (for setpoint shift)
●Active sensors 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
I/O modules TXM (Series D and later)
Description
Type
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
PXC4 can power TXM extensions modules (for details see planning overview A6V11973797)

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System controller
Description
Type
Data sheet
System controller to integrate Modbus and MS/TP devices
PXC5.E003
A6V11646020
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
27
98 11
16
Date/Series
S/N
WLAN
Default
4
Plug-in terminal block with screw terminals
KNX, PL-link, for future use
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
Plug-in terminal block with screw terminals
COM, Modbus RTU
10
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)
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
Yellow
Flashing
Continuously OFF
Communication
No communication to subsystem
COM RX
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
WLAN inactive

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Activity
LED
Color
Activity
Function
Steady ON
Flashing
WLAN active and at least one WLAN client
connected
WLAN active and no WLAN client connected
Service
button
Short press (< 1 s)
Long press (> 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, CE declarations, etc., can be
downloaded from the following Internet address:
https://siemens.com/bt/download
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.
●This equipment is intended only for use in a restricted access area (lockable cabinet)
●This equipment is not suitable for use 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.
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

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CAUTION
Risk of overheating for failure to comply with ambient temperature
Burning and damage to the device
●Ensure sufficient ventilation to comply with the permissible ambient temperature within
the panel or installation box. The temperature must be at least 10 K (18° F) lower
outside the installation box.
Installation
WARNING
No internal line protection for supply lines to external consumers
Risk of fire and injury due to short-circuits!
●Adapt the wire cross sections as per local regulations to the rated value of the installed
fuse.
WARNING
The relay outputs may be connected to mains voltage
Risk of electrical shock!
●Use terminal covers or install the device in a lockable cabinet.
Disposal
The device is considered an electronic device for disposal in accordance
with the European Guidelines and may not be disposed of as domestic
garbage.
●Dispose of the device through channels provided for this purpose.
●Comply with all local and currently applicable laws and regulations.
Technical data
Power supply
Operating voltage (24 V~, ⏊, )
AC 24 V -15 / +20 % (SELV / PELV) or
AC 24 V Class 2 (US)
48…63 Hz
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

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Power consumption (for transformer planning)
Base load (without loading by I/O modules TXM and
field devices)
8 VA / 0.33 A
Field device supply V+ (DC 24 V, 100 mA)
(terminals 8 and 19)
5 VA / 0.2 A
Field device supply V~ (AC 24 V, 2 A)
(terminals 18 and 29)
48 VA / 2 A
I/O modules TXM supply
15 VA / 0.6 A
Function data
Hardware information
Processor
Texas Instruments AM335x, 300 MHz
Storage
128 MByte SDRAM (DDR3)
512 MByte NAND 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.
Interfaces
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
Max. tightening torque
0.6 Nm (0.44 lb ft)
BACnet MS/TP interface
Interface type
EIA-485, electrically isolated
Baud rate
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)
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
Modbus RTU interface
Interface type
EIA-485, electrically isolated
Baud rate
1200, 2400, 4800, 9600, 19200, 38400, 57600, 115200
(depending on the configuration)
Internal bus termination
120 Ohm, switchable with DIP switch

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Modbus RTU interface
Internal bus polarization
270 Ohm pull-up/pull-down resistances, switchable with
DIP switch
Cabling (in-house cabling only)
Cable length
3-wire cable
Max. 1000 m (3300 ft)
Protection
Short-circuit proof
Protection against faulty wiring with AC 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 show 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 show something like:
Date/Series: 20190423A0000550
S/N: 1400052738
SSID = <ASN>_<Running number after the series letter> and password = <S/N>
I/O modules TXM interface
Nominal voltage
DC 24 V
Power supply for I/O modules TXM
Max. 300 mA
Parallel switchable with 24VDC Supply TXS1.12F4
For details, see: TX-I/O engineering and installation,
CM110562
Protection
Short-circuit proof
Connector for I/O modules TXM on the side: No
protection against faulty wiring with AC 24 V
No electrical protection.
Use the cover

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Inputs
12 universal inputs U1...U12 with the following functions
Temperature measurement, analog
Type
Range (over range)
Resolution
AI NTC10K
-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) *)
-50...600 °C (-52.5...610 °C)
-58...1112 °F (-62.5...1130 °F)
20 mK
0.036 °F
AI PT1K 375 (NA) *)
-50...180 °C (-52.5...185 °C)
-58...356 °F (-62.5...365 °F)
10 mK
0.018 °F
AI (LG-)Ni1000 *)
AI 2x (LG-)Ni1000 *)
Resistance sensor, analog
Type
Range (over range)
Resolution
AI 1000 Ohm *)
0...1000 Ω (0...1050 Ω)
0.1 Ω
AI 2500 Ohm *)
0...2500 Ω (0...2650 Ω)
0.1 Ω
AI Pt1000 *)
0...2500 Ω (0...2650 Ω)
0.1 Ω
AI 1000-1175 Ohm *) for setpoint shift
1000...1175 Ω (900...1295 Ω)
0.1 Ω
*) 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
Min. 490 Ω
AI 0-20 mA
0...20 mA (-3...23 mA)
1 µA
Min. 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 (25Hz)
20
10
25 Hz
CI El (100Hz)
5
0
100 Hz

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Outputs
Analog output
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 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
Switch-on current
NO contact: Max. 10 A (1 s)
NC contact: Max. 3 A (1 s)
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 fact at ind. load (cos phi = 0.6)
5 x 105switchings
1 x 105switchings
1 x 105switchings
0.6
Insulating strength between relay contacts and system
electronics (reinforced insulation).
AC 3750 V, as per EN 60730-1
Field device supply (Onboard)
AC 24 V (terminal V~)
Max. 2 A, short-circuit proof *)
DC 24 V (terminal V+)
Max. 100 mA, short-circuit proof, protected against
incorrect wiring with AC 24 V
Field device supply (I/O modules TXM)
AC 24 V (terminal V~ on the I/O modules TXM)
Max. 2 A, short-circuit proof *)
*) Sum total onboard V~ and TXM bus V~ max. 2 A

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Conformity
Ambient conditions and protection classification
Classification as per EN 60730
Automatic action
Control function
Degree of pollution
Overvoltage category
Type 1
Class A
2
III
Design
Suitable for use in protection class I or II systems
Degree of protection 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 60721-3-2
●Operation as per IEC/EN 60721-3-3
●Class 1K22 / 2K21
Temperature -25...70 °C (-13...158 °F)
Air humidity 5...95 % (non-condensing)
●Class 3K22
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 2M11
●Class 3M11
Standards, directives and approvals
Product standard
EN 60730-1
Product family standard
EN 50491-x
Electromagnetic compatibility (EMC)
For residential, commercial, and
industrial environments
EU conformity (CE)
See CE declaration 1)
EAC compliance
Eurasian compliance
RCM conformity
See RCM declaration 1)
UL/cUL approbation (US / Canada)
UL916; http://ul.com/database
CSA certification
C22.2, http://csagroup.org/services-industries/product-
listing
FCC
CFR 47 Part 15 Class B
BACnet.
B-BC
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).
1) Documents can be downloaded at http://siemens.com/bt/download.
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.

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●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 the user’s 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 licence-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.
Radio frequency radiation exposure Information for USA and Canada
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 (8 in)
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
RAL 7035 (light grey) / RAL 7016 (anthracite grey)
Dimensions
per DIN 43880, see dimensions
Weight without/with packaging
484 g / 554 g
Connection terminals
65 66 67 68 69 70
34 5 6 7
89
Terminal
Symbol
Description
Module
Channel
3, 4
KNX
KNX PL-Link (for future use)
5, 6
24 V ~, ⏊
Operating voltage AC 24 V
7
Functional ground (must be connected on the installation side
with the building grounding system (PE).
8 to 29
Ux
Universal inputs/outputs
61
1…12
⏊
Measuring ground for Ux

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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
65, 66, 67
MSTP
Interface EIA-485 (BACnet MS/TP)
68, 69, 70
COM
Interface EIA-485 (Modbus RTU)
Term
on, off
Switch for bus connection
Polar
on, off
Switch for polarization
75 to 86
DOx
Relay outputs
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 80 m (260 ft) with shielding

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Examples of connection diagrams for universal inputs/outputs
Digital inputs
Ux
Ux
S1
S2
Feedback contact (NO)
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
Ux
Ux
Ux
Ux
M
B
V
VV
Ux
+
V+
+
+ +
B1
B2
B3
B4
B5
B6
Temperature sensor LG-Ni 1000
Temperature sensor, general
Resistance transmitter
Active sensor powered by the automation station
Active sensor with external power
Do NOT ground external power (ground loops)
Active sensors 0 ... 20 mA or 4 ... 20 mA (2-wire)
On U1, U2, U7, U8 only
Analog outputs
Ux
Ux
V
Ux
+
V+V+
Y1
Y2
Y3
Device with input DC 0...10 V
General device with control input DC 0...10 V,
Powered by the automation station
General device with control input DC 0...10 V,
Do NOT ground external power (ground loops)
Warranty
Technical data on specific applications are valid only together with Siemens products listed
under "Equipment combinations". Siemens rejects any and all warranties in the event that
third-party products are used.

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Issued by
Siemens Switzerland Ltd
Smart Infrastructure
Global Headquarters
Theilerstrasse 1a
CH-6300 Zug
Tel. [phone]
www.siemens.com/buildingtechnologies
© Siemens Switzerland Ltd, 2020
Technical specifications and availability subject to change without notice.
Document ID
A6V11937668_en--_b
Edition
2020-07-10
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 I/O modules TXM
198 (7.80") 64 (2.52") 64 (2.52")
90 (3.54")
7 (0.28")