2002-1391 is a single-channel digital/analog inputs and outputs terminal module made by Wago, a German manufacturer of electrical components. This module allows users to conveniently connect digital and analog signals, with a single terminal on either side. The 2002-1391 offers a wide variety of connection types, including push-in, screw, and combination. It also provides isolation up to 500 V, high noise immunity, overvoltage protection, and LED status indicator. The module comes in a rugged housing with a combination of LED and push-button operation indicator. It is used in numerous industrial applications such as motion control, building automation, and process control.