SICK WS0-4RO4002 Safety Relay Output Module for MELSEC-WS Series

The SICK WS0-4RO4002 (WS0-4RO4002) is a safety relay output expansion module designed for use with MELSEC-WS series safety programmable logic controllers. Manufactured by SICK for modular machinery safety systems, this unit provides isolated relay output contacts to safely de-energize actuator circuits, motor starters, contactors, and protective stopping devices. Operating within the safety controller architecture alongside WS0-series central processing units such as the WS0-CPU0 and WS0-CPU1, the module expands the switching capabilities of the safety system while maintaining dependable functional performance. It is engineered to integrate seamlessly into small- to medium-scale safety control setups, enabling safe stop monitoring across production machinery, packaging equipment, robotic cells, and material handling systems. With its durable housing and secure backplane bus connection, the module delivers dependable operation in demanding factory environments.