Control system

The invention provides a structure capable of using time by using a conventional control counter. A plant automation control system is provided with: a first unit (100) and a second unit (200) that exchange data; and a synchronization unit that uses a clock (191A) to synchronize the control counter (126) of the first unit and the control counter (213) of the second unit, and each unit stores information (30) that is shared between the units and that is related to a conversion that calculates a time on the basis of a counter value of the counter of the unit. 本发明提供一种能够使用以往的控制用的计数器来利用时刻的结构。工厂自动化的控制系统具有：交换数据的第1单元(100)和第2单元(200)；以及同步单元，其使用时钟(191A)，使第1单元所具有的控制用的计数器(126)与第2单元所具有的控制用的计数器(213)同步，各单元保存在单元间共享的与换算相关的信息(30)，所述换算是根据该单元的计数器的计数器值来计算时刻。