The 6ES7221-3BF50-0XB0 is a signal board.
It belongs to the SIMATIC S7-1200 G2 series.
It provides 8 digital input channels.
It reads 24 volt DC signals.
It counts pulses up to 100 kilohertz.
It accepts sink and source wiring.
It plugs into the CPU front slot.
It is a Siemens S7-1200 signal module.

