S7-200 CPU 222
The Siemens 6ES7212-1BB21-0XB0 is a SIMATIC S7-200 CPU 222 compact unit, powered by AC and equipped with 8 DC inputs and 6 relay outputs. The AC power supply allows direct connection to AC mains power. Relay outputs handle motor starters or small valves up to the rating, and the 4 KB code space fits the ladder logic for a typical pump station sequence. PROFIBUS DP gives you a remote I/O link if the panel is far from the well.