Product Description:

The X20AT2311 is a module manufactured by B&R Automation as part of the X20 Fieldbus Input Output Modules series. Within an automation rack, it captures resistance-based temperature signals and relays them to the central controller. The product accepts sensor wiring through the I/O slice and delivers converted values onto the fieldbus, allowing precise thermal feedback for process loops, machine protection, and energy management tasks.

It provides 2 independent channels, so a pair of sensors can be monitored on a single slice without occupying additional slots. Each channel is factory calibrated for Pt100 platinum RTD sensors, eliminating the need for external linearization hardware. The analog front end resolves changes as small as 0.001°C, which supports finely tuned control of slow-varying thermal loads. When the slice is mounted horizontally inside the cabinet, its operating envelope spans -25 to 60°C; this range safeguards accuracy in chilled rooms as well as in machines that radiate moderate heat. Reliable conversion is maintained up to an installation height of 0 to 2000 m, covering most production facilities from sea level to elevated industrial sites.

Different thermal constraints apply once the module is installed in a vertical stack; under that orientation, the allowable ambient narrows to -25 to 50°C, reflecting reduced convective cooling. Signal acquisition is executed through Resistance Measurement, so the electronics measure ohmic variation rather than voltage potential, minimizing lead-wire sensitivity for long runs. It operates as a Temperature Input Module, with cold-junction compensation, excitation current, and digital filtering handled internally. This arrangement helps keep update jitter low during vertical mounting, where heat rises across the board surfaces.