The E3663AC is a hardwired digital input module manufactured by ABB Automation and produced as part of their industrial control product line, AGT (Advanced General Technology). This unit provides 8 digital inputs, which can be used to detect on/off or open/closed conditions. It provides protection against short circuits and overload, and the inputs can be set up as a single pulse, a pulse latch, or a frequency counter. The input range is 0-inputs, 5-60VAC/DC, and the maximum input current is 10mA. This module can be integrated with many other components of the AGT control system, and features LED indicators for each input to show the module's status.