What it is and key specs
The Siemens 6ES7211-0AA23-0XB0 is an S7-200 CPU from the current production line, built for small to medium automation tasks. It supports LAD, FBD, and STL programming and carries an integrated RS485 interface with MPI and PPI protocols for communication with HMI panels and other S7 CPUs. The 24 V DC supply has a permissible range of 15.4 to 28.8 V. Power loss is typ. 3 W. Four high-speed counters (30 kHz each) are available for encoder input or pulse counting.
Integration notes
Footprint is 90 x 80 x 62 mm. Backup time reaches 50 h with the high-performance capacitor (200 days typ. with optional battery module). Retentive memory uses capacitor or battery; no EEPROM wear-out concern for the program.