ABB DI840 Digital Input Module

Description

The ABB DI840 Digital Input Module is a dedicated component designed for use in Distributed Control Systems (DCS). As a digital input (DI) module, it detects external on/off switch status signals, making it suitable for connecting to devices such as switches, buttons, limit switches, and proximity switches. Typical applications include sending start signals to variable frequency drives or monitoring equipment operation states, fault alarms, and manual/automatic mode statuses. For the key code AA variant, the module has physical dimensions of 45 mm (1.77 inches) in width, 102 mm (4.01 inches) or 111 mm (4.37 inches) in depth (depth includes connector), and 119 mm (4.7 inches) in height, with a total weight of 0.15 kg (0.33 lbs). This compact form factor allows for efficient integration into control system racks. While detailed electrical parameters are not available, the module follows standard digital input functionality, processing discrete logic signals to support critical control and monitoring tasks in industrial automation environments.