The ABB DI821 is a digital input module for the ABB Advant Controller 400 series. It provides 16 discrete input channels for connecting various digital devices to the controller. Each input channel can be configured as either a sinking (NPN) or sourcing (PNP) input, depending on the wiring requirements of the connected devices.

The DI821 module supports different types of signals, including low voltage DC signals and high voltage AC/DC signals. It is designed to handle a wide range of input voltages and provides protection against overvoltage and short-circuit conditions.

The module is typically used in industrial automation applications to monitor the status of sensors, switches, push buttons, or other digital devices. It provides reliable and accurate input signals to the Advant Controller for further processing and control.

ABB DI821 3BSE008550R1 Digital Input Module Datasheet