M2-Di - Digital Input Controller
The M2-DI digital input controller utilizes the M2 hardware platform, but comes with one or two M2-CDI plug in modules that plug into the M2 expansion slots. This eliminates any digital output functionality from the controller. The M2-DI is identical to the M2, it just removes digital outputs and replaces them with 16 digital inputs via the M2-CDI plug in cards. See the M2-CDI datasheet for more information on how these digital inputs are wired and configured.