The Omron EE-SPY402 is a safety controller designed to help provide a safe working environment during the use of industrial machinery. The controller works in conjunction with programmable logic controllers (PLCs) to monitor and control the various safety-related operations within a given plant or factory. The EE-SPY402 works with a variety of safety-related sensors and input devices, and is capable of issuing warnings and shut-down commands as necessary. Additionally, the EE-SPY402 also features an emergency stop button and status indicator, both of which can be programmed to meet the requirements of any given application.