The IRFC4/Dis a 8K2 control card for the CMO range of safety edges. This must be used withthe CMO safety edges if you wish to achieve a Category 3 safety standard. The cardhas the facility to take up to 4 safety edges. And has 2 NC outputs. The inputscan be individually turned on or off via dip switched on the control card andthere are for indication light that show the status of each safety edge.