BES212, BES212/N Bachmann Bus Expansion Modules

Product Description

The Bachmann BES212 and BES212/N are bus expansion slave modules that connect distributed I/O SubDevices to a control system through a high-speed bus connection. The modules support daisy-chain interconnection of up to six SubDevices, with a maximum cable distance of 3 m between two stations and an access time below 1.5 us. Both models provide two bus interfaces, while the BES212/N includes an integrated power supply for the connected SubDevice.

Hardware Specifications

Bus Expansion and Distributed I/O

The BES212 series extends the connection between the control system and distributed I/O stations. Its two bus interfaces support a daisy-chain topology, allowing up to six SubDevices to be interconnected. Each SubDevice can accommodate up to 15 M200 standard modules, subject to the supported system configuration.

The specified access time of less than 1.5 us describes the bus access performance. The maximum 3 m cable length applies between two stations and uses a CAT7 special cable with RJ45 connectors. These physical and timing limits should be considered when arranging distributed stations.

BES212 vs. BES212/N

The main documented difference is the integrated power supply. The BES212 is the bus expansion slave module with two interfaces, while the BES212/N adds an integrated power supply for the SubDevice.

The integrated supply specification includes a 24 V operating reference, an 18-34 VDC input range, and separate +5 V, +15 V and -15 V output ratings. Verify the required power configuration and station arrangement before selecting the part number.

Communication and Power Supply Features

The module uses RJ45 connectors to simplify bus cabling. The expansion bus does not require a special protocol for I/O access; the control system can access the connected modules as if they were local I/O, according to the specified system architecture.

An integrated watchdog monitors the slave modules. This function supports supervision of module operation, although the available specifications do not define its timeout value or fault-response behavior.

Frequently Asked Questions

Q: What is the difference between BES212 and BES212/N?

A: Both models provide two bus interfaces for distributed I/O expansion. The BES212/N includes an integrated power supply for the SubDevice, whereas the BES212 is listed as the version without that integrated supply.

Q: How many distributed SubDevices can the bus expansion support?

A: The documented configuration supports up to six stations connected in a daisy chain. Each SubDevice can handle up to 15 M200 standard modules, with a maximum cable length of 3 m between adjacent stations.

Q: Which cable should be used for the bus connection?

A: The specified transmission medium is CAT7 special cable with RJ45 connectors. Keep the cable distance between two stations within 3 m.

Other Attributes

• Country of Origin:  Austria
• Lead Time: In Stock, 2 Working Days

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