Mitsubishi MELSEC series can be divided into small and large series. Small series for the FX series maximum 256 I/O points, large series I/O points up to 8,192 points, and has a rich network of Q, QnA series and a–series. Among them, the Q–Series high performance CPU will not only have access to Q–Series modules, and are compatible with the previous a and AnS the various modules and hardware configuration. Q–Series CPU can only use the Q Series modules. Composed in PLC system, the Q Series PLC each slot can be installed any digital module, analog module, Web module, communication module.