This increases the reliability of safety systems by reducing the possibility of miswiring complex safety interlock systems or operator overwriting while increasing the difficulty of operator tampering. The system also provides continuous data logging on the status of safety devices. Two main modules are available. The F3SX-N module monitors and reports broken lines to warning displays, warning operators of potential problems. The F3SX-E module is a maintenance-free unit designed for use with equipment using high frequency start-stop operations.