Mitsubishi PLC QY40P is a built-in RS232 communication port transistor output module that supports the installation of a memory card. It is only used in the A mode. The built-in device memory capacity of the CPU is increased to a maximum of 60K words, and the increased control and quality management data can be processed at high speed. Even if the memory space of the device is insufficient, the file register area can be easily expanded by installing an extended SRAM card.