Product Description:

The 3EX450.66-1-NO is a modular communication controller produced by B & R Automation for the System 2005 Controllers series. It plugs into a System 2005 rack and manages fieldbus traffic between the main CPU and distributed devices. By offloading cyclic data exchange from the processor, the unit improves scan consistency and simplifies network expansion in packaging lines, conveyor cells, and assembly workstations.

The configuration interface is accessed through a service socket that follows the RS232 electrical standard; this channel operates at a fixed 9.6 kbit/s and lacks galvanic isolation, which is acceptable for short in-cabinet links. For plant-wide communication, the module offers a fieldbus port based on RS485; telegrams on this line can reach up to 12 Mbit/s and the node table can accommodate as many as 125 slaves before performance drops. Input buffers accept 3.5 KB of process variables per scan, while an identical area is reserved for output words that hold actuator commands. A 9-pin D-sub connector provides mechanical retention, and internal optocouplers enable fieldbus isolation so that external faults do not propagate to the backplane circuitry.

Power budgeting is straightforward. The board draws 5.5 W in total, divided between a 24 Vdc rail that supplies 1.1 W to discrete circuitry and a 5 Vdc rail that feeds 4.4 W to logic components. Its dual-ported RAM cache is sized at 8 KB, giving the local CPU enough space to stage deterministic data transfers without blocking user tasks. A protection rating of IP20 means the enclosure is touch-safe but not sealed against dust, so installation inside a controlled cabinet is required. Maximum input and output payloads of 3.5 KB each support sizable I/O images for mid-scale machines, while total power dissipation stays within cabinet cooling limits.