| 摘要 |
PURPOSE:To rationalize the capacity of a memory by providing the memory of a data link device with an address conversion mechanism for addressing of this memory. CONSTITUTION:A programmable controller (PC) 210 is constituted with an essential PC consisting of CPU211, a main memory 211A, an I/O 212, and a common bus 213, a bus interface 214, and the data link device consisting of a connecting circuit 215 and a link data storage part 218. This link data storage part 218 is provided with a memory 216 for buffer and an address conversion mechanism 217. The address conversion mechanism 217 performs the address conversion for correspondence between addresses on a bus 219 and addresses of the main memory 216. In this address conversion, a block to which a given input/output address belongs is discriminated, and an address of the main memory 216 to which this block corresponds is calculated. |
