DATA COLLATION DEVICE, COLLATION METHOD AND SAFETY SECURITY SYSTEM USING THE SAME

摘要

PROBLEM TO BE SOLVED: To enable a collation circuit to accurately collate data even when the synchronization error of output data from two CPU occurs.SOLUTION: The data collation device includes: a synchronous signal generation circuit 10 for generating a synchronous signal 3 on the basis of data 1a and 1b to be transmitted from a plurality of data sources A and B; a synchronization error detection circuit 20 for generating a synchronization adjustment signal 5 on the basis of the synchronous signal 3; and a synchronization adjustment collation circuit 30 for collating the data 1a and 1b by adjusting a collation timing on the basis of the synchronization adjustment signal 5. Thus, it is possible to collate the data 1a and 1b to be transmitted from the two data sources A and B whose synchronization error is likely to occur.