Fit and power budget
The 6ES7288-3AT04-0AA0: Snaps onto the S7-200 SMART DIN-rail slice, 45 mm wide, 100 mm high, 81 mm deep. Sips 70 mA from the 5 V DC backplane supply (CPU supplies that). Reverse polarity protected on the 24 V DC sensor supply input. Leaves plenty of headroom for additional I/O modules on the same bus.
