B&R X20cBB57
Base for all X20 Compact-S CPUs RS232 connection CAN bus connection Integrated terminating resistor for CAN bus The bus module is the base for all X20 Compact-S controllers. The left and right end cover plates are included in delivery.
Lifecycle & replacement
No manufacturer-published lifecycle data for B&R part numbers is indexed here yet. Ask IAC to check availability and an upgrade path.
IAC stocks legacy spares and exchange units and quotes upgrade paths. Send us the nameplate details and we will confirm a compatible replacement.
Technical specifications
Short description
| Bus module | X20 Compact-S PLC base - backplane for Compact-S PLC and Compact-S PLC power supply module |
| Interfaces | 1x RS232 connection, 1x CAN bus connection |
General information
| Power consumption / Bus | 0.55 W |
| Power consumption / Internal I/O | - |
| Certifications / CE | Yes |
| Certifications / UKCA | Yes |
| Certifications / CRA (Cyber Resilience Act) | In preparation |
| Certifications / UL | cULus E115267 Industrial control equipment |
| Certifications / DNV | Temperature: B (0 to 55°C) Humidity: B (up to 100%) Vibration: B (4 g) EMC: B (bridge and open deck) |
| Certifications / LR | ENV1 |
| Certifications / KR | Yes |
| Certifications / ABS | Yes |
| Certifications / BV | EC33B Temperature: 5 - 55°C Vibration: 4 g EMC: Bridge and open deck |
| B&R ID code | 0xA457 |
| Additional power dissipation caused by actuators (resistive) [W] | - |
I/O power supply
| Nominal voltage | 24 VDC |
| Permissible contact load | 10 A |
Electrical properties
| Electrical isolation | Bus, CAN bus and RS232 not isolated from each other |
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 |
| 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 | - |
| Temperature / Storage | -40 to 85°C |
| Temperature / Transport | -40 to 85°C |
| Relative humidity / Operation | Up to 100%, condensing |
| Relative humidity / Storage | 5 to 95%, non-condensing |
| Relative humidity / Transport | 5 to 95%, non-condensing |
Mechanical properties
| Note | Left and right X20 end cover plates included in delivery |
| Pitch | 37.5⁺⁰.² mm |
Documentation & CAD
Files hosted by B&R Industrial Automation; links open the official download page.
Datasheets
Manuals
3D CAD models
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.