3EX450.77 B & R Automation
Wake Industrial LLC is not an authorized distributor of this product.
The B & R Automation 3EX450.77 is part of the System 2005 Controllers series and functions as a DeviceNet master with support for up to 63 slaves. It features an operating temperature range of 0 to 55°C and a protection rating of IP20. The controller has an 8 KB DPM, supports a maximum input and output data of 3.5 kB each, and consumes a total power of 5.5 W.
Internal Product Review
The 3EX450.77 is a B & R Automation System 2005 controller configured as a DeviceNet master with IP20 protection. Matching 3.5 kB input and 3.5 kB output capacity supports clean, balanced data exchange in distributed control architectures. A maximum of 63 slaves makes this module a strong fit for larger DeviceNet installations.
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Product Description:
B & R Automation manufactures the 3EX450.77, a communication module in the System 2005 Controllers series. This unit serves as the network interface between a controller and DeviceNet field nodes, allowing deterministic I/O exchange across an industrial installation. Its role is to offload network processing from the main CPU while maintaining predictable scan times on the plant floor.
At the field level, the bus type is DeviceNet master. The IF1 port uses a 9-pin male DSUB connector and supports a maximum transfer rate of 9.6 kbit/s, a setting favored for long cable runs where lower baud rates preserve signal integrity. A second channel, IF2, terminates on a 5-pin male multipoint connector and can operate at up to 500 kbit/s, enabling faster polling cycles when cable length is short. Internal dual-ported memory is sized at 8 KB, providing buffer space for process images that travel between the controller CPU and the DeviceNet network. The module can accept 3.5 kB of input data per scan and deliver an equal 3.5 kB of output data, so payload planning must consider this symmetrical throughput ceiling.
For installation planning, the module draws 1.1 W from the 24 V DC segment supply and 4.4 W from the 5 V DC backplane, giving a combined dissipation of 5.5 W. It is protected to the IP20 level, so placement is limited to enclosed panels that prevent tool or finger contact with live conductors. Functional limits span 0 to 55 °C in operation, –25 to 70 °C in storage, and 5 % to 95 % non-condensing humidity, ensuring reliable service in typical shop-floor environments. The master can coordinate 63 field devices on a single trunk, a capacity sufficient for medium-sized machine installations.
