The inovancePLC H1U 4A BD is an expansion card that provides two analog inputs and two analog outputs for the H1U series PLCs. This card is designed to be installed into an available slot on the PLC's base unit, and can be used to interface with analog sensors or output devices. The analog inputs can measure voltage or current signals, and the analog outputs can provide voltage or current signals to control actuators or other devices. The H1U 4A BD card can be configured and programmed using the inovance PLC software or other compatible programming tools.