DOUBLED DATA SYNCHRONIZATION SYSTEM

摘要

PROBLEM TO BE SOLVED: To prevent a data display from changing owing to the switching of doubled system. SOLUTION: This doubled data synchronization system sends the data in a transmit data area 16 on which the arithmetic result of an in-use PC (programmable controller) 3A is reflected to the interface area 18 for a central monitor device 1 and the receive data area 12 of a standby PC 3B, which copies the data in the receive data area 12 to a transmit data area 11 and the interface area 14 for the central monitor device 1 and does not reflect the arithmetic result of the standby PC 3B on the transmit data area 11 of the standby PC 3B and the interface area 14 for the central monitor device 1.