| 摘要 |
<p>PURPOSE:To check whether contents of data held at a non-volatile RAM are fair or not by comparing the contents of two non-volatile RAM, checking the contents of the non-volatile RAM of the central control station and operating a system after the coincidence of the contents is confirmed. CONSTITUTION:The contents stored in the non-volatile RAM of a central control acting station 11c are transmitted through a transmitting line 12 to a central control station 11a and stored into a RAM 21. Next, the contents of a non- volatile RAM 22 of the central control part 11a and the contents of the second non-volatile RAM of the central control acting station 11c stored at the RAM 21 are compared through a data bus 23 and the contents of the non-volatile RAM 22 are checked. When both are coincident, the fair data are stored to the non-volatile RAM 22 and the system is operated. When both are not coincident, the error is generated at the non-volatile RAM 22, the system is not operated and the occurrence of the error is informed to the user. Thus, it can be checked whether or not the data contents held at the non-volatile RAM are fair.</p> |
