The Siemens 6AG1244-0BB12-2BA1 is a current-production I/O module with 2 analog inputs and outputs, 6 optically isolated digital inputs, and 2 relay change-over outputs, plus an RS485 interface.
Mounting and power
IP20-rated, 73 x 199 x 46 mm. 24 V DC supply (20.4–28.8 V external), max 0.5 A, 5.5 W. Derate 3 K/1 000 m above 1 000 m altitude.
I/O specifics
Digital inputs are optically isolated in a separate potential group; select NPN or PNP by wiring the common. Switching thresholds: 4 V for 0→1, 1.6 V for 1→0. The two analog inputs are differential, 10-bit resolution, and can be configured as supplementary digital inputs. Two relay change-over contacts handle small loads. Failsafe operation uses two standard digital inputs.