Bachmann BEM211 Bus Expansion Module

Overview

The BEM211 is a Bus Extension Module from Bachmann electronic GmbH. It extends the internal M1 backplane bus to a second module group. This allows flexible system expansion across multiple module groups. The module supports distributed placement when space or system design limits exist. It ensures minimal signal delay and maintains bus timing integrity. BEM211 connects up to six local substations, with distances of up to 3 meters between stations.

Technical Specifications

• Purpose: Extends the internal M1 backplane bus to a second module group

• Connection Type: Ribbon cable linking primary and secondary backplanes

• Bus Compatibility: Compatible with M1 system bus

• Module Placement: Installed at the end of the first module group and start of the second

• Power Supply: Draws power directly from the system backplane

• Signal Integrity: Maintains timing and synchronization across extended bus segments

• Isolation: No galvanic isolation; modules share common ground

• Form Factor: Standard M1 module size

• Mounting: DIN rail compatible

• Housing: Rugged industrial-grade enclosure

• Operating Temperature: −25°C to +60°C

• Storage Temperature: −40°C to +85°C

• Humidity: 5% to 95% non-condensing

• Vibration Resistance: Complies with industrial standards

• Bus Expansion: Supports up to six local substations

• Distance Between Stations: Up to 3 meters with minimal signal delay