What this order code gets you
The 6AG1400-1TA01-2AA0 is the SIPLUS spare part version of the standard S7-400 UR1 rack, 18 slots with two power-supply slots, built in steel for environments requiring medial stress tolerance and an extended ambient range of -25°C to +60°C. It cross-references directly to the 6ES7400-1TA01-0AA0 base model – same footprint, same backplane – but with the steel enclosure and wider temperature rating that makes it the right choice for dirty, humid, or temperature-cycling plant floors.