| 摘要 |
PURPOSE:To prevent misoperation in an air conditioning device through a microcomputer, by handling memory data before a change as a regular preset temperature signal in case of the change in the memory data of RAM or the like when an interruption instruction is not given. CONSTITUTION:A signal H to an interruption instruction input terminal INT, that is, at off time of switches 2, 3, data of addresses D1, D2 in a memory unit 9 are arithmetically compared, if the decision is not equal, awrite of new data to the address D1 is stopped while the data of the address D2 is transferred to the address D1. In consequence, the data before a change is continuously output from the address D1, on the basis of the preceding data, an air mixing door or the like is controlled to display data contents by display devices 12, 13. In this way, in case of no interruption signal, the data in the address D1 should never be changed at normal time, here the data is compared to prevent misoperation. Thus the necessity for a complicated trouble is eliminated, and error control can be prevented. |
