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Short description
I/O module 4-channel PWM motor bridge, 4 ABR incremental encoders
General information
B&R ID code 0xE8A4
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
Encoder power supply Yes, using status LED and software
I/O power supply Yes, using software
Power consumption
Bus 0.01 W
Internal I/O 2.4 W
External I/O 50 kHz
24 VDC 3.3 W / channel
48 VDC 4.7 W / channel
60 VDC 5.4 W / channel
External I/O 10 kHz
24 VDC 2.1 W / channel
48 VDC 2.4 W / channel
60 VDC 2.6 W / channel
External I/O 5 kHz
24 VDC 2 W / channel
48 VDC 2.1 W / channel
60 VDC 2.2 W / channel
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
Encoder power supply
Quantity 2
Output voltage 5 VDC
Output current Max. 200 mA each
Short-circuit proof, overload protection Yes
Digital inputs
Quantity 12
Nominal voltage 5 VDC, asymmetrical (single-ended)
Input circuit Source
Input filter
Hardware <1 µs
Software -
Connection type 1-wire connections
Input resistance Typ. 2.7 kΩ
Additional functions 4x ABR incremental encoder
Switching threshold
Low <2 V
High >3 V
Insulation voltage between channel and bus 500 Veff
ABR incremental encoder
Quantity 4
Encoder inputs 5 VDC, asymmetrical (single-ended)
Counter size 16-bit
Input frequency Max. 100 kHz
Evaluation 4x
Signal form Square wave pulse
PWM output
Quantity 4
Nominal voltage 24 to 48 VDC ±25%
Nominal current 6 A
Maximum current 10 A (2 s)
PWM frequency 15 Hz to 50 kHz
Actuator power supply
Supply External
Fuse Required line fuse: Max. 32 A slow-blow (see "Overcurrent protection")
Output protection Thermal cutoff for overcurrent and short circuit
Variant H bridge
Configurable dither Amplitude, frequency
Period duration resolution 16-bit, min. 20 μs
Phase shift PWM1, 2, 3, 4 each 90°
DC bus capacitance 680 μF
PWM pulse width
PWM mode 15-bit + sign ≥10 ns
Current mode 15-bit + sign ≥10 ns
Insulation voltage between channel and bus 500 Veff
Electrical properties
Electrical isolation
Channel isolated from bus

Channel not isolated from channel
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 permitted
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 2x X20TB12 terminal block separately
Order 1x 0TB3103-7020 terminal block separately
Pitch 87.5+0.2 mm
Material number:
  • 4x outputs (H bridge) with PWM control and 24 to 48 VDC ±25% supply
  • 6 A nominal current (10 A max. current)
  • 15 Hz to 50 kHz frequency, 16-bit
  • PWM resolution, 15-bit + sign, minimum 10 ns
  • Configurable dither
  • 12 inputs 5 V, configurable for AB and ABR incremental encoders
  • 2x 5 V encoder supply with up to 200 mA
  • Source connection of digital inputs for encoder's open collector outputs
  • 1-wire connections

The PWM motor bridge module is used to control 4 DC motors with a nominal voltage of 24 to 48 VDC ±25% at a nominal current up to 6 A. The module can be reconfigured and used in current controller mode for controlling inductive loads. The module is also equipped with 12 digital inputs, which can be used as incremental counters. The 4 motors are controlled with a full-bridge (H-bridge). This enables the motors to be moved in both directions.

Mandatory Accessories
Terminal blocks
0TB3103-7020 Accessory terminal block, 3-pin, screw clamps 6 mm²
X20TB12 X20 terminal block, 12-pin, 24 VDC keyed
Automation Studio HW Upgrades Version (Date) Download
V3.0 HW Upgrade (X20MM4455) EXE / 2 MB
V4.0 HW Upgrade (X20MM4455) EXE / 2 MB
Documentation Version (Date) Download
Data sheet X20MM4455 PDF / 710 KB
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 STEP X20MM445x ZIP / 995 KB

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