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Short description
I/O module 1 full bridge for controlling stepper motors
General information
B&R ID code 0x2681
Status indicators I/O function per channel, operating state, module status
Module run/error Yes, using status LED and software
Output Yes, using status LED and software
I/O power supply Yes, using software
Power consumption
Bus 0.01 W
Internal I/O 1.8 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 E225616
Power conversion equipment
HazLoc cCSAus 244665
Process control equipment
for hazardous locations
Class I, Division 2, Groups ABCD, T5
KC Yes
Motor bridge - Power unit
Quantity 1
Type 2-phase bipolar stepper motor (full bridge)
Nominal voltage 24 VDC -15% / +20%
Nominal current 1 A
Maximum current 1,2 A for 2 s (after a recovery time of at least 10 s at maximal 1 A)
Controller frequency 38.4 kHz
DC bus capacitance 57 µF
Step resolution Max. 256 microsteps per step
Digital inputs
Quantity 4
Nominal voltage 24 VDC -15% / +20%
Input circuit Sink
Input filter
Hardware <5 µs
Software -
Connection type 1-wire connections
Input resistance Typ. 18.2 kΩ
Additional functions 1x ABR incremental encoder
ABR incremental encoder
Quantity 1
Encoder inputs 24 V, asymmetrical
Counter size 16-bit
Input frequency Max. 50 kHz
Evaluation 4x
Electrical properties
Electrical isolation
Channel isolated from bus

Channel not isolated from I/O power supply
Operating conditions
Mounting orientation
Horizontal 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 Not allowed
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 X20TB12 terminal block separately
Order 1x X20BM11 bus module separately
Pitch 12.5 +0.2 mm
Material number:
  • 1 stepper motor, 24 VDC, 1 A (1.2 A peak)
  • Resolution of current values at 1%
  • Maximum, rated and holding current configured independent of each other
  • 38.5 kHz PWM frequency
  • Integrated motor detection
  • 256 micro-steps
  • Stall detection
  • Complete integration in Automation Studio and CNC applications
  • 4 inputs, 24 VDC, can be configured as ABR
  • Ramp function model based on the CANopen communication profile DS402
  • NetTime timestamp: Position change, trigger time

The stepper motor module is used to control stepper motors with a rated voltage of 24 VDC at a motor current up to 1 A (1.2 A peak). Additionally, this module has four digital inputs that can be used as limit switches or as encoder inputs.

Due to the individual adjustment of the coil currents, the motor is only operated with the current it actually needs. This simplifies the selection of the available motors and prevents unnecessary heating. Because this affects energy consumption and thermal load, the effects are positive on the service life of the complete system. Complete flexibility is achieved through the use of independently adjustable holding, maximum and nominal current values. The current for microsteps is automatically adjusted to the configured current values.

The automatic motor identification system is an enormous help during standstills. The stepper motor modules can identify the connected motors using their coil characteristics and generate feedback in the form of an analog value. This makes it possible to detect not only wiring errors, but also incorrect motor types being used mistakenly. A stall detection mechanism is integrated to analyze the motor load. Detection of the stall is defined via a configurable threshold. This allows an overload or motor standstill to be detected precisely in many different types of applications.

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
V2.6 HW Upgrade (X20SM1426) EXE / 2 MB
V3.0 HW Upgrade (X20SM1426) EXE / 3 MB
V4.0 HW Upgrade (X20SM1426) EXE / 2 MB
Certificates Version (Date) Download
244665 CSA HazLoc Certificate of Compliance X20, X67 PDF / 56 KB
FTZU 09 ATEX 0083X PDF / 697 KB
Safe cutoff of potential groups PDF / 147 KB
Documentation Version (Date) Download
Datasheet X20SM1426 PDF / 1 MB
X20 System User´s Manual PDF / 56 MB
E-CAD (Electro or EPLAN Templates) Version (Date) Download
X20 EPLAN P8 from V2.4 EXE / 161 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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