Here's a breakdown of the module's specifications:

24-volt DC Power Supply: This module provides the necessary power to operate the CompactLogix 5370 system. It accepts a 24-volt DC input voltage.

30 Digital Inputs: These inputs can be used to monitor the status or receive signals from external devices or sensors. They are compatible with a wide range of digital signals.

24 Digital Outputs: These outputs can be used to control or activate external devices such as motors, solenoids, or indicators. They can provide either sourcing or sinking outputs.

The 24QBB designation in the module's name indicates the number and type of I/O points it supports. In this case, 24QBB means it supports 24 digital inputs and 24 digital outputs.