B&R X20SBD4M1-D1
Module X20SBD4M1-D1 is a motor controller for controlling stepper motors and brushless DC motors (BLDC) up to 1 kW. With 48 V, this compact drive offers 2 axes per device. The module saves space in the control cabinet due to its narrow design with a width of 27.5 mm. The field-oriented current control achieves higher efficiencies.
Lifecycle & replacement
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Technical specifications
Short description
| I/O module | 2-axis motor module with encoder interface |
| Interfaces | 1x X2X Link |
General information
| Diagnostics / Module run/error | Yes, using LED status indicator and software |
| Diagnostics / Output | Yes, using LED status indicator and software |
| Diagnostics / I/O power supply | Yes, using software |
| Power consumption / External I/O / 24 VDC | TBD |
| Power consumption / External I/O / 48 VDC | TBD |
| Power consumption / Bus | 0.6 W |
| Power consumption / Internal I/O | - |
| Certifications / CE | Yes |
| Certifications / CRA (Cyber Resilience Act) | In preparation |
| B&R ID code | 0x3A55 |
| Status indicators | I/O function per channel, operating state, module status |
| Additional power dissipation caused by actuators (resistive) [W] | - |
Motor output stage
| Module power supply / Supply | External |
| Module power supply / Fuse | No |
| Quantity | 2 axes |
| Type | Bipolar stepper motor or 3-phase BLDC motor |
| Nominal voltage | 24 to 48 VDC ±25% |
| Nominal current | Up to 8 A |
| Maximum current | Up to 16 A |
| Max. output frequency | Not limited |
| DC bus capacitance | ≥230 µF |
| Output protection | Overload, short circuit |
Motor holding brake connection
| Protective measures / Overload and short-circuit protection | Yes |
| Quantity | 2 |
| Output voltage | 24 VDC |
| Continuous current per connection | 1 A |
| Switching frequency | 80 kHz |
| Max. overcurrent limiting | 1.3 A |
| Undercurrent threshold | <80 mA |
| Reference potential | GND |
Encoder power supply
| Protective measures / Short-circuit proof | Yes |
| Quantity | 2 |
| Output voltage | 5.25 V |
| Output current | Max. 125 mA per channel |
Enable inputs
| Switching threshold / Low | <5 VDC |
| Switching threshold / High | >15 VDC |
| Switching delay at nominal input voltage / Enable 1 → 0, PWM off | 2 ms |
| Switching delay at nominal input voltage / Enable 0 → 1, ready for PWM | 1 ms |
| Quantity | 1 |
| Input voltage | 24 VDC ±25% |
| Input current at nominal voltage | Approx. 4 mA |
| Insulation voltage between input and bus | 1210 V |
| Input capacitance | 2.5 nF |
SSI absolute encoder
| Switching threshold / Low | >1 V |
| Switching threshold / High | <-1 V |
| Quantity | 2 x SSI interface / BiSS interface (C mode) |
| Encoder inputs | 5 V, symmetrical |
| Counter size | 48-bit |
| Max. transfer rate | 1 Mbit/s |
| Coding | Binary, gray |
| Minimum diff. slew rate | -- |
| Insulation voltage between encoder and bus | 1210 V |
ABR incremental encoder
| Input filter / Hardware | Symmetrical: 2.6 MHz / Asymmetrical: 70 kHz |
| Input filter / Software | -- |
| Switching threshold / Low | Symmetrical: <-1 V / Asymmetrical: <1.8 V |
| Switching threshold / High | Symmetrical: >1 V / Asymmetrical: >3.3 V |
| Quantity | 2 |
| Encoder inputs | Symmetrical: 5 V / Asymmetrical: 5 V |
| Counter size | 31-bit |
| Input frequency | 1 MHz |
| Evaluation | 4x |
| Minimum diff. slew rate | -- |
| Common-mode range | Symmetrical: ±10 V / Asymmetrical: -- |
| Insulation voltage between encoder and bus | 1210 V |
Digital Hall sensor
| Switching threshold / Low | <1.6 V |
| Switching threshold / High | >3.4 V |
| Quantity | 2 |
| Variant | Open collector / Push-pull |
| Input voltage | Max. 10 V |
| Hardware input filter | 33 kHz |
| Internal pull-up | 4700 Ω |
| Push-pull impedance | 1300 Ω |
| Insulation voltage between encoder and bus | 1210 V |
Electrical properties
| Electrical isolation | Motor output stage / Motor control unit isolated from bus |
Operating conditions
| Mounting orientation / Horizontal | Yes |
| Mounting orientation / Vertical | Yes |
| Installation elevation above sea level / 0 to 2000 m | No limitation |
| Installation elevation above sea level / >2000 m | Reduction of ambient temperature by 0.5°C per 100 m |
| Installation elevation above sea level / Maximum | 4000 m |
| Degree of protection per EN 60529 | IP20 |
Ambient conditions
| Temperature / Operation / Horizontal mounting orientation | -25 to 60°C |
| Temperature / Operation / Vertical mounting orientation | -25 to 50°C |
| Temperature / Derating | TBD |
| Temperature / Storage | -40 to 85°C |
| Temperature / Transport | -40 to 85°C |
| Relative humidity / Operation | 5 to 95%, non-condensing |
| Relative humidity / Storage | 5 to 95%, non-condensing |
| Relative humidity / Transport | 5 to 95%, non-condensing |
Mechanical properties
| Dimensions / Width (pitch) | 27.5 ⁺⁰.² mm |
| Dimensions / Height | 124 mm |
| Dimensions / Depth | 92 mm |
| Note | Order terminal blocks and cables separately. |
Documentation & CAD
Files hosted by B&R Industrial Automation; links open the official download page.
Datasheets
Manuals
3D CAD models
ECAD / EPLAN
Get a quote for a replacement
Industrial Automation Co. stocks, sources, and repairs B&R parts — new, refurbished, or exchange units with warranty.
Specifications from the official B&R product catalog. Always confirm against the datasheet for your exact revision.