Programmable controller

摘要

This invention provides a programmable controller, for increasing capacity of the data memory area which a user can use by a page function, without increasing access time to the data memory. The data memory 1 in which data is stored is divided into a common area 2 and an expansion area 4. A page specifying area 3 for specifying a page in the expansion area 4 is provided within the common area 2. A data in a memory card 5 corresponding to the page specified in the page specifying area 3 is transferred to the expansion area 4 for a CPU to access that data. And the page can be changed with a page changing device 6 within the memory card, therefore it is possible to obtain the memory capacity arbitrarily. <IMAGE>