Siemens 6FX1118-4AA01 Industrial Safety Relay

Siemens 6FX1118-4AA01 is an industrial SINUMERIK in-/output module that provides a high-density digital I/O interface for older Siemens CNC control systems. The module offers 48 input points and 24 output points, enabling a compact expansion of I/O connections for sensors and actuators in machine tools and other automated equipment. Classified as part of the SINUMERIK 3 family, the 6FX1118-4AA01 is designed to be integrated with compatible SINUMERIK controllers to centralize digital I/O functions in a single chassis module. As an obsolete product, Siemens discontinued this model on June 30, 2005, and it is no longer manufactured or stocked new by Siemens; compatible units may be found as refurbished or used through third-party suppliers. Typical scenarios include retrofitting or maintaining legacy SINUMERIK installations that require additional input and output channels without upgrading to newer I/O platforms. When sourcing this part, verify compatibility with your SINUMERIK controller and any relevant service documentation, and consider replacement options from current Siemens I/O modules if you are starting a new project. The 6FX1118-4AA01's design focuses on reliable digital signaling within the SINUMERIK ecosystem, providing a straightforward expansion path for existing CNC or automation setups that rely on a multi-channel I/O architecture.