B&R X20BM01 Power Bus Base Module

Model Positioning

X20BM01 = Power Bus Base Module for the B&R X20 System

Chinese Name: Power Bus Base Module

Caracteristica de bază: The internal I/O supply is disconnected to the left and only conducts to the right. It is used to create independent potential groups and works in conjunction with X20 power supply modules (X20PSxxxx).

Core Function Description

1. Carries the X2X Link backplane communication bus (communication signals between left and right modules are connected).
2. Unidirectional transmission of the I/O supply rail: Modules on the right receive power; modules on the left cannot draw I/O power via this module.
3. Serves as the mandatory mating base for X20 power supply modules (X20PS3300 / X20PS9400, etc.).
4. Enables potential isolation of I/O segments. Multiple independent 24 VDC I/O supply zones can be configured on one continuous bus rail.

Critical Distinction (Common Selection Pitfall)

X20BM01: I/O supply disconnected left, conducted right (unidirectional power supply, preferred for segment isolation)

X20BM11: I/O supply bidirectionally connected (I/O power linked across the entire DIN rail)

2. Complete Technical Specifications

3. Hardware Structure & Logica de cablare
4. Conductivity rules for three signal/power paths:

✅ X2X communication bus: Continuously connected between left and right modules

✅ Bus supply (controller supply): Connected between left and right modules

❌ Field I/O supply rail: Disconnected to the left; power only passes to the right

2. Application Specifications:

X20PS power supply modules must be clipped onto the BM01. The 24 VDC I/O power generated by the power module can only supply all I/O modules installed to the right of the BM01.

If two mutually isolated I/O power zones are required on one rail, install one X20BM01 between the two zones to separate the I/O supply.

Suitable scenarios: Separate I/O power for different machine sections, preventing loss of all I/O caused by a short-circuit at a single point.

Unsuitable scenario: All I/O modules on the rail share one 24 Alimentare VDC (select X20BM11 in this case).

4. Ghid de selecție & Common Pitfalls
5. X20BM11 cannot replace X20BM01 unconditionally

X20BM11 provides bidirectional power continuity and eliminates potential isolation. Short-circuit faults will propagate across segments. Special topologies apply to power redundancy schemes.

2. One X20PS power supply module shall only be paired with one BM01 base; multiple power supplies cannot share a single X20BM01.
3. Automation Studio hardware catalog: Minimum supported version V4.2, minimum module firmware 2.2.0.0.
4. For dusty or humid environments, order X20cBM01 (cu acoperire conformă).
5. Common Matching Components

Power base module: X20BM01

Bidirectional power base module: X20BM11

Rail termination base module: X20BM05

Power supply modules: X20PS3300, X20PS9400

Application Scenarios of B&R X20BM01

Recap of core electrical characteristic:

X2X communication bus and controller bus supply are bidirectionally connected; field 24 VDC I/O supply is disconnected to the left and only conducted to the right.

Funcţie: Divide I/O supply segments on the DIN rail to implement independent segmented power supply and fault isolation. X20PS power modules must be mounted on X20BM01.

Reference benchmark: X20BM11 provides bidirectional I/O power continuity across the rail and cannot implement segment isolation.

1. Standard Typical Application Scenarios

1.1 Independent I/O Power Supply for Multiple Machine Sections (Cele mai comune)

Machines with multiple independent motion units require separated 24 VDC I/O power supplies, avoiding complete I/O failure caused by short-circuit of a single sensor.

Topologie:

Controlor / remote head → General input modules → X20BM01 + X20PS → All I/O for Machine Section 1

The BM01 isolates power; modules on the left do not draw power from this 24 Alimentare VDC.

Echipamente aplicabile:

Mașini de turnat prin injecție, blow molding machines

Mașini de ambalare (segmentation for feeding, etanșare, triere & discharging stations)

Machine tool automation, stamping manipulators

New energy lithium equipment: Independent I/O zoning for calendering, slitting and winding stations

Benefit: A short-circuit at one station only stops the local segment; the controller and I/O of other sections remain operational.

1.2 Power Separation Between Digital I/O and Analog Modules

Industry best practice: Analog signals (presiune, temperatură, encoder signals) should avoid sharing the same 24 VDC supply with high-power digital outputs (electrovalve, indicator lamps), to prevent interference from inductive loads affecting analog sampling accuracy.

Topologie:

Analog module bank → X20BM01 + power supply → Solenoid valve / relay output module bank

Suppresses transient disturbance from high-power loads on AI/AO modules and encoders, improving analog signal stability.

1.3 Potential Separation Between Safety Circuits and Standard I/O

Safety-related signals (porti de siguranta, oprire de urgență, safety light curtain inputs) use an independent power supply, separated from power for standard actuators.

X20BM01 divides the rail into segments: one zone for safety I/O, another for general actuators.

Notă importantă: Power segmentation cannot replace safety relays or safety PLCs. It serves only as an auxiliary measure for electrical noise reduction and fault isolation.

1.4 Voltage Drop Optimization via Multi-point Power Supply on Long DIN Rails

When more than approx. 12~16 I/O modules are installed on one rail, a single 24 VDC cable will suffer excessive voltage drop.

Soluţie: Install additional X20BM01 + X20PS assemblies along the rail for segmented power feeding.

Echipamente aplicabile: Large conveying lines, automated warehouse sorting cabinets, large coating production line control cabinets.

1.5 Segmented Power Supply for Remote X20 Nodes (X2X Link Remote Stations)

X20BC remote bus controllers (EtherCAT / POWERLINK remote heads) extend a continuous DIN rail:

The remote head supplies power to the front group of modules

Additional BM01 + external power supply installed mid-rail to provide independent power for rear I/O modules

Suitable for remote control cabinets on large production lines and remote I/O stations for multi-station mobile equipment.

2. Industry-Specific Deployment Scenarios
3. Food Packaging & Pharmaceutical Equipment

Industry specifications require separated power supply for actuators in clean zones and internal control signals inside cabinets. Reduces disturbance from solenoid valve switching on weighing modules and flowmeters.

2. New Energy Lithium & PV Equipment

Higher risk of sensor cable breakage and short circuits in dusty environments. Segmented power supply prevents a single short-circuit from disabling all I/O on an entire remote station and reduces production downtime.

3. Mașini portuare & Marine Equipment (DNV certified)

Control cabinets have compact layout with densely packed modules. Segmented power supply mitigates voltage fluctuation and suits vibration-prone operating conditions.

4. Cauciuc & Extrudarea plasticului, Cast Film Production Lines

Large quantities of heating elements and solenoid valves (sarcini inductive). Strict power separation from temperature acquisition modules to prevent temperature signal fluctuation.

3. Scenarios Where X20BM01 Is NOT Suitable
4. All I/O modules on the DIN rail share a single external 24 VDC supply → select X20BM11
5. Termination at the far end of the DIN rail → use X20BM05 (X20BM01 must not be used as rail terminator)
6. Pure communication extension without requirement for additional independent I/O power supply
7. Requirement for bidirectional disconnection of I/O supply (BM01 only cuts power to the left; bidirectional isolation cannot be achieved)
8. Engineering Design Guidelines & Evitarea capcanelor
9. X20PS power supply modules can only be mounted on BM01, not on BM11 or BM05.
10. Current calculation: Total current of all modules to the right of each BM01 shall not exceed the rated 10 A of the base module.
11. Do not mount multiple X20PS power modules on one X20BM01.
12. If independent power supplies are required for both left and right sides, deploy two X20BM01 modules back-to-back in the topology.
13. Quick Selection Summary

Independent 24 VDC I/O supply required for segment fault isolation → X20BM01

Continuous power across the whole rail with no segmentation needed → X20BM11

Rail end termination module → X20BM05