Schneider BMXXBP1200 12-Slot PLC Backplane

This backplane provides twelve expansion slots for Modicon M340 PLC modules. It houses the communication bus that connects power supply, CPU, and I/O units. You can build scalable control systems using this fundamental chassis component.

Technical Specifications

Parameter	Value
Model	Schneider BMXXBP1200
Category	12-Slot PLC Backplane
Number of Slots	12
Supported Modules	BMX P34 CPU, BMX supply, BMX I/O, BMX communication
Bus Type	X-bus (proprietary parallel bus)
Maximum Bus Speed	8 Mbps
Rack Width	45 mm per slot = 540 mm total
Dimensions (W x H x D)	54.0 cm × 11.5 cm × 8.5 cm
Weight	1.2 kg (2.65 lbs)
Mounting	Horizontal or vertical on DIN rail or panel
Auxiliary Power Output	24 VDC at 0.5 Amps (for supply to CPU)
Operating Temperature	0°C to 60°C
Storage Temperature	-40°C to 85°C
Connector Type	Internal X-bus connectors (12 positions) + power connector
Component Count	1 PCB + 12 module connectors + 4 mounting tabs + 1 power header
Energy Storage	None (passive backplane)
Materials	PBT plastic housing, copper traces, tin-plated contacts

Slot Configuration and Layout

The Schneider BMXXBP1200 gives you twelve positions for M340 series modules. Slot 1 typically holds the power supply unit for the entire rack. Slot 2 accepts the CPU module for program execution. Slots 3 through 12 accommodate discrete I/O, analog I/O, or communication modules. This layout follows standard Modicon rack architecture.

Bus Communication Design

The internal X-bus handles all data exchange between modules automatically. It operates at a fixed 8 Mbps speed for deterministic scan times. This parallel bus transfers I/O status and configuration data without user programming. Consequently, you can mix different module types freely across all twelve slots.

Installation and Mounting

You can mount this backplane horizontally or vertically inside your control cabinet. Four metal mounting tabs provide secure attachment to DIN rail or a subpanel. For best results, mount the unit on a flat, grounded metal surface. Leave 5 cm of clearance above and below for cable routing and airflow.

Compatibility and Module Support

This backplane accepts all BMX series power supplies, CPUs, and I/O modules. It also supports BMX network communication modules for Ethernet, Profibus, or CANopen. You cannot mix older TSX or Premium series modules in this rack. Therefore, plan your system architecture using only M340 components.

Physical Design and Construction

The PBT plastic housing resists chemicals and moisture commonly found in industrial panels. Copper traces on the PCB carry power and data signals between module slots. Tin-plated contacts resist corrosion and maintain reliable electrical connections. The 1.2 kg weight provides stable mounting without stressing cabinet walls.

Power Distribution

The backplane distributes +5 VDC and +24 VDC power to all installed modules. It also provides a separate 24 VDC auxiliary output at 0.5 Amps. You can use this auxiliary output to power the CPU or an external device. All power comes from the supply module in slot 1, no external wiring required.

Why Choose This Backplane

This original Schneider backplane guarantees proper bus timing and slot spacing. Aftermarket racks often cause communication errors or module fitment issues. Therefore, choose this genuine part for reliable M340 system installations and expansions.