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Short description
I/O module 4 digital outputs for switching electromechanical loads, pulse width modulation
General information
B&R ID code 0xEC21
Status indicators I/O function per channel, operating state, module status
Module run/error Yes, using status LED and software
Outputs Yes, using status LED and software (output error status)
Power consumption
Bus 0.01 W
Internal I/O 1.4 W
Additional power dissipation caused by actuators (resistive) [W] -
CE Yes
ATEX Zone 2, II 3G Ex nA nC IIA T5 Gc
IP20, Ta (see X20 user's manual)
FTZÚ 09 ATEX 0083X
UL cULus E115267
Industrial control equipment
Digital outputs
Nominal voltage 24 VDC
Nominal output current 0.75 A
Total nominal current 3 A
Connection type 1-wire connections
Output circuit Sink
Output protection Thermal cutoff if overcurrent or short circuit occurs, integrated protection for switching inductances
Pulse width modulation
Period duration 1 ms (1 kHz) or 20 µs (50 kHz)
Pulse duration 0 to 100%
Resolution for pulse duration 1%
Inrush current 1.5 A for max. 25 ms
Braking voltage when switching off inductive loads 27 VDC
Reverse polarity protection No (must be protected externally)
Output voltage
Minimum 18 VDC
Nominal 24 VDC
Maximum 48 VDC
Electrical properties
Electrical isolation
Channel isolated from bus

Channel not isolated from channel and I/O power supply
Operating conditions
Mounting orientation
Horizontal Yes
Vertical Yes
Installation elevation above sea level
0 to 2000 m No limitations
>2000 m Reduction of ambient temperature by 0.5°C per 100 m
Degree of protection per EN 60529 IP20
Ambient conditions
Horizontal mounting orientation 0 to 50°C
Vertical mounting orientation 0 to 40°C
Derating -
Storage -25 to 70°C
Transport -25 to 70°C
Relative humidity
Operation 5 to 95%, non-condensing
Storage 5 to 95%, non-condensing
Transport 5 to 95%, non-condensing
Mechanical properties
Note Order 1x terminal block X20TB12 separately
Order 1x bus module X20BM11 separately
Pitch 12.5+0.2 mm
Material number:
  • 4 digital outputs
  • Control of PWM output signals based exactly on NetTime
  • 4x oversampling output functions
  • Integrated output protection
  • 24 VDC and GND for actuator power supply

The module has digital outputs for connecting electromechanical loads (e.g. valves and relays) and additional functions such as edge generation.

With a resolution down to 125 ns, the module makes it possible to set switching operations at exactly specified moments.

The following operating modes can optionally be supplemented with PWM functionality:

  • Direct I/O
  • Oversampled I/O
  • Edge generator
  • Edge generator in toggle operation for output patterns such as digital cam switches (e.g. digital cam switch of function block "ASMcDcsTimedDigitalCamSwitch")

Additional functions:

  • PWM modulation of outputs for setting the overexcitation and holding current.
  • Configuration of each channel by specifying PWM period duration
  • Control value for overexcitation current, holding current and overexcitation time
  • Possibility of disabling high-speed cutoff
Mandatory Accessories
Bus modules
X20BM11 X20 bus module, 24 VDC keyed, internal I/O supply continuous
X20BM15 X20 bus module, with node number switch, 24 VDC keyed, internal I/O supply continuous
Terminal blocks
X20TB12 X20 terminal block, 12-pin, 24 VDC keyed
Automation Studio HW Upgrades Version (Date) Download
V4.0 HW Upgrade (X20CM4323) EXE / 2 MB
Certificates Version (Date) Download
E115267 UL CoC X20 PDF / 847 KB
Documentation Version (Date) Download
Datasheet X20CM4323 PDF / 954 KB
X20 System User´s Manual PDF / 56 MB
M-CAD (Mechan. Templates) Version (Date) Download
3D File DXF/STEP X20 Electronic module ZIP / 10 KB
3D File STEP X20 I/O-Slice ZIP / 872 KB
Dimensions PDF X20 Electronic module PDF / 3 KB

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