Abstract: There is provided a central operation processing unit including a temperature control management unit that compares a temperature value detected by a temperature monitoring unit of a functional unit in a basic block with a prescribed value corresponding to the functional unit in the basic block and being set in advance individually, and, on the basis of a result of the comparison, controls an operation of the cooling unit of the functional unit from which the temperature value compared with the prescribed value is detected.

Abstract: A PLC system in which a power supply unit, a CPU unit, a first termination end unit, and another unit are connected via a connector, wherein the another unit and the first termination end unit include voltage measuring units, the CPU unit includes a voltage measuring unit and a voltage monitoring control unit performing a voltage value obtaining process of reading the voltage value stored in the voltage measuring unit of the first termination end unit, the another unit, or the CPU unit and determining whether the voltage value is a specified value or higher and displays the result on a display unit in numerical form, and the voltage monitoring control unit performs the voltage value obtaining process on a unit in order from the first termination end unit toward the power supply unit side until a unit whose voltage value is the specified value or higher is identified.