7EX477.50-1 B & R Automation
Wake Industrial LLC is not an authorized distributor of this product.
The B & R Automation 7EX477.50-1 is part of the System 2003 Controllers series and supports a nominal input voltage of 24 VDC, with a maximum of 30 VDC. It features one RS485 interface, uses a 9-pin D-type connector, and supports up to 31 slave devices. The controller operates with a master/slave bus access principle and has a maximum power consumption of 20 W.
Internal Product Review
The 7EX477.50-1 is a B & R Automation System 2003 controller with an RS485 interface and master/slave bus access. Technical execution looks strong, with 24 VDC nominal input and interface isolation supporting clean integration in distributed control cabinets. Support for up to 31 slaves without repeater makes the unit a very capable choice for compact networked automation.
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Product Description:
The 7EX477.50-1 is an I/O communication module produced by B & R Automation for the System 2003 Controllers series. Designed for cabinet-mounted control racks, the unit links distributed I/O stations to the controller backplane and manages serial data flow across the system bus. By coordinating addressable slave nodes, it supports deterministic exchange of process signals in industrial automation lines.
It operates from a nominal supply of 24 VDC and accepts an input range from 18 VDC to 30 VDC, which helps the board remain functional during brownouts or supply variation. A single communication interface, implemented as an RS485 transceiver, is isolated from the logic section to help prevent ground loops. The physical link exits through a 9-pin D-type (F) connector, and bus access follows a master/slave principle so the controller arbitrates telegram traffic while slaves respond in turn. Up to 31 remote devices can attach without a repeater when shielded twisted-pair cable is used and the termination resistor is applied externally at the end of the line. Address selection is handled by an onboard number switch, and diagnostic LEDs indicate operating state, power, and communication errors.
Data transfer rates of 100/181/500/1000/2000 kBit/sec are selectable to match cable length and electromagnetic noise levels. During runtime, the module draws no more than 20 W, while 14 W of that power budget is reserved for I/O output power to connected circuitry. Shielded twisted-pair cabling helps maintain signal integrity, and isolation between the interface and logic blocks reduces the spread of faults between sections. The bus access method scans slaves in sequence, and the diagnostic LEDs provide a clear indication of communication status during operation. The module has one communication interface, which keeps the network connection straightforward.
