This is the SIPLUS variant – same logic, wider climate window
Siemens 6AG1212-1AD30-2XB0 is the SIPLUS version of the S7-1200 CPU 1212C, built for environments where the standard part won't hold. It runs the same FBD and LAD programs as the commercial-grade sibling, but with an operating range from -40 to 70 °C. That's the number that decides fit if your panel sees freezer duty, desert heat, or an unheated warehouse. Integrated 1 Mbyte of load memory holds a decent size project, and the 240 h typical backup time means the program stays put through a long weekend shutdown. DC supply is 24 V nominal, rated for 20.4 V to 28.8 V – enough headroom for a tired 24 V bus.
The most common cross-shop candidate is the standard 6ES7212-1AD30-0XB0. This SIPLUS part shares the same processor, memory, and I/O map – same project loads, same programming. The difference is temperature: the 6AG variant is rated -40 to 70 °C versus the 6ES part's typical 0 to 60 °C. Also carries cULus, CE, and FM approval; the standard part may not have all three depending on production batch. Mechanical footprint is identical – 90 mm wide, 100 mm high, 75 mm deep – so it swaps into a panel wired for the 6ES variant without any DIN-rail or gland-plate changes. Same 24 V DC supply, same PROFINET port (TCP/IP, no Modbus RTU on the same interface).
Integration notes – mounting and wiring
90 mm wide, 75 mm deep. PROFINET port with autocrossing; backup time 240 h typical using integral EEPROM.