The 6ES7131-1BL11-0XB0: This module accepts 32 sink/source digital inputs at 24V DC. The description notes expansion capability via the TB 16SC terminal block of Smart Connect, allowing up to 16 additional channels. That expansion is handled through the terminal block, not extra modules, so panel wiring and slot count stay the same.
Lifecycle stage is marked current. This part is still a standard catalog item available through Siemens distribution.