CONTROL SYSTEM

A control system is obtained which is capable of detecting abnormality at an early stage by determining abnormality whether it exists or not between calculation processes which calculate a control value(s) for executing control processing of a control apparatus, even when it is executing the control processing, and, during which, unknown cyber-security attack is received. In the control processing, normal time information is compared with respective execution-time information in relation to write-and-read execution order with respect to a predetermined address range of a first storage unit used by a calculation process for calculating a control value (s), write-and-read execution timing in the predetermined address range thereof, a write-and-read value(s) in the predetermined address range thereof, and a write starting address thereof and a write size thereof; and, under the comparison by a determination unit, it determines abnormality when at least any one among those is riot coincident with one another.