| 摘要 |
When operations of control sections 102a and 102b are changed, if the type of unprocessed data is not changed, the whole of table A' of control section 102b corresponding to table A of control section 102a is cleared, table B is created in an area different from table A', the old type data stored in table A is converted to new type data and stored in table B. After this data type conversion processing is started, difference data (old type data) written in control section 102a is stored in table A' after all data is cleared, this stored difference data is converted to new type data and written in table B and the corresponding data in table A' is cleared. When there is no more difference data through this data type conversion processing, switching between the operational and standby systems is performed.
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