| 摘要 |
PROBLEM TO BE SOLVED: To avoid the storage of data having an indefinite value from a volatile memory to a nonvolatile memory even if a power source is cut off after power activation or power recovery.SOLUTION: In a digital type protection relay system 1, after power activation or power recovery, a CPU 2 performs setting for masking a maskable interruption. After the data in an EEPROM 5 is extracted to a RAM 4, the CPU 2 sets the maskable interruption into a non-mask state, receives a power source cutoff signal S1 from a power source cutoff detection section 6, and enables interruption processing due to the power source cutoff. |
