The 2558 is an analog input module featuring 8 channels with 16-/32-bit resolution, supporting voltage ranges of 0-5V/0-10V and current ranges of 0-20mA/4-20mA per channel (unipolar/bipolar input). It offers a 5ms update rate and is compatible with 2500 series I/O bases. This module serves as a replacement for Siemens 505-6108-A/B models.