Product Description:

The X20DI4371 is a digital input slice from B & R Automation and belongs to the X20 Fieldbus Input Output Modules series. It brings discrete sensor data into distributed control architectures by converting external on/off states into logic-level information that is forwarded over the X20 system bus. Typical tasks include reading limit switches, pushbuttons, or proximity sensors on machinery. By packaging four inputs in a narrow housing, the unit reduces panel width while allowing remote expansion of I/O nodes close to the process.

Each channel accepts 24 VDC signals and is wired in sink mode, meaning the field device sources current into the module. The four inputs provide 4 logical points that can be scanned at the controller’s cycle rate for high-speed monitoring. Internal electronics draw only 0.13 W of bus-module power, so heat dissipation is minimal and several units can be lined up without exceeding cabinet thermal budgets. The housing carries an IP20 protection rating that prevents accidental contact with live parts but is intended for closed enclosures, and the circuitry is classified in Overvoltage Category II, indicating it withstands transient levels normally found on branch circuits supplied from a main switchboard.

Additional power figures guide installation. The backplane must furnish 0.14 W for bus communication logic and 0.59 W for the internal I/O circuits, while connected sensors may draw up to 12 W through the module’s supply pins. Mechanical endurance is defined by a shock limit of 15 g and a vibration tolerance of 1 g, permitting reliable operation on mobile or packaging machinery exposed to moderate impacts and continuous motion. These limits help determine mounting positions and confirm that no extra shock isolation is required in typical control cabinets.