Product Description:

The 7IF321.7 is a communication interface module produced by B & R Automation for the System 2003 Controllers series. It adds a dedicated serial channel to a controller, allowing the CPU to exchange data with drives, HMIs, or barcode readers that rely on asynchronous links. By providing a configurable RS485 or RS422 physical layer, the module enables deterministic, full-duplex communication between the control system and distributed field devices that participate in industrial automation tasks such as data acquisition and parameter setting.

The board supplies one port that supports RS485/RS422 signaling through a 9-pin D-sub socket. With no handshake lines, transmission control is handled entirely in software. Data can be clocked out at up to 115.2 kBit/s, and cable runs may reach 1200 m without a repeater when the correct impedance and shielding are observed. The channel is electrically isolated from the PLC backplane, minimizing ground-loop currents and improving noise immunity. The interface draws only 1.4 W from the internal 5 V supply, leaving ample power budget for additional I/O modules on the same rack.

Mechanical integration follows the System 2003 layout. The unit occupies controller CPU slots 1, 2, 3, so multiple interfaces can be installed for parallel links. The housing carries an IP20 rating, permitting installation inside a switch cabinet where access to live parts is prevented by the enclosure. A screw-in format secures the module to the carrier rail and provides a defined ground path through the mounting hardware. Because isolation is implemented within the port electronics and the module consumes little power, thermal load and crosstalk inside densely populated racks remain low, allowing stable controller operation in continuous service.