USR-IO4040 controller is a new generation of IO acquisition and control module launched by someone. It adopts expanded structural design, flexible matching, standard RS485 interface, and standard Modbus RTU protocol to quickly achieve application matching. The product is compact in size, rail + mounting ears. Three-dimensional installation saves space. Simple and practical, with rich indicator lights, you can judge the device status at a glance. The USR-IO4040 4 DI (Digital Input) + 4 DO (Digital Output) Extension Module is an advanced industrial device meticulously designed to extend the capabilities of the M100 series. This module seamlessly integrates with M100 controllers, enhancing digital input and output functionalities for a diverse range of applications in industrial automation, control systems, and process monitoring.