2NW100.50-1 B & R Automation
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The B & R Automation 2NW100.50-1 is part of the System 2010 Controllers series and uses Token Passing and Master/Slave access methods. The controller supports up to 127 stations with repeaters and features two RS485 interfaces with supported baud rates up to 500 kbit/s. It utilizes shielded twisted pair as the transfer medium and includes diagnostic LEDs and two 9-pin D-sub connectors.
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Product Description:
The 2NW100.50-1 is a communication controller produced by B&R Automation within the System 2010 Controllers series. It occupies one rack slot and links centralized CPUs with distributed field devices over an RS485 bus. By coordinating framed data exchange among stations, the module enables deterministic message scheduling and reliable I/O updates in assembly lines, material-handling systems, and process plants. Its role is to bridge rack-based control hardware and field-level communication without requiring a separate standalone gateway.
Network arbitration relies on a token-passing and master/slave scheme, so only the node holding the logical token may initiate frames while slave responses remain time-bounded. Physical wiring uses two 9-pin female D-sub connectors that route two isolated RS485 channels for redundant or segmented cabling. The two-channel arrangement supports orderly routing where one branch serves local equipment and the other extends to another bus section. The message format conforms to DIN 19245 Parts 1 and 2, ensuring compatibility with other System 2010 participants. The controller draws up to 15 W maximum of rack power during peak traffic. Communication travels over shielded twisted-pair cabling, and direct bus coupling eliminates repeater circuitry between the controller and the backplane. Four rotary number switches set the node address, diagnostic LEDs indicate status, and the topology is a linear physical bus.
In extended installations, the controller can be paired with backplane options such as BP101 and BP110 to maintain signal continuity across adjacent slots. With repeater support, the segment count reaches 127 stations with a repeater before protocol timing margins are exceeded. Maximum cable distance is 1200 m at 9.6 to 93.75 kbit/s, 1000 m at 187.5 kbit/s, and 400 m at 500 kbit/s. Selectable data rates of 9.6, 19.2, 93.75, 187.5, and 500 kbit/s provide a practical balance between throughput and reach. This lets the same controller serve short high-speed links or longer low-speed runs on the same network standard. Internal timers automatically adjust token rotation intervals so latency stays predictable when network speed or size changes.
