A control system comprising: a calculation unit configured to execute an arithmetic operation process; and a power supply unit configured to supply power to the calculation unit, wherein the power supply unit includes: a power converting unit configured to charge a part of an input power input from an outside and converts a remainder of the input power into the power supplied to the calculation unit; and a first detection unit configured to compare a voltage of the input power with a threshold voltage and output a notification signal for notifying that predetermined power supply is not able to be performed in a case in which a time, over which a magnitude of the voltage has been lower than the threshold voltage, is detected to be over a first measurement time set in advance, the first detection unit is able to change a setting of the threshold voltage by an external operation, and characterised in that the calculation unit includes: a second detection unit configured to output an instruction signal for instructing an execution of pre-stop processing in preparation for stopping of the predetermined power supply in a case in which it is detected that a second measurement time set in advance has elapsed after receiving the notification signal; and a processing execution management unit configured to continue execution of the arithmetic operation process during the second measurement time and executes the pre-stop processing in place of the arithmetic operation process that is currently being executed after receiving the instruction signal, the second detection unit is able to change a setting of the second measurement time by an external operation. a calculation unit configured to execute an arithmetic operation process; and a power supply unit configured to supply power to the calculation unit, wherein the power supply unit includes: a power converting unit configured to charge a part of an input power input from an outside and converts a remainder of the input power into the power supplied to the calculation unit; and a first detection unit configured to compare a voltage of the input power with a threshold voltage and output a notification signal for notifying that predetermined power supply is not able to be performed in a case in which a time, over which a magnitude of the voltage has been lower than the threshold voltage, is detected to be over a first measurement time set in advance, the first detection unit is able to change a setting of the threshold voltage by an external operation, and characterised in that the calculation unit includes: a second detection unit configured to output an instruction signal for instructing an execution of pre-stop processing in preparation for stopping of the predetermined power supply in a case in which it is detected that a second measurement time set in advance has elapsed after receiving the notification signal; and a processing execution management unit configured to continue execution of the arithmetic operation process during the second measurement time and executes the pre-stop processing in place of the arithmetic operation process that is currently being executed after receiving the instruction signal, the second detection unit is able to change a setting of the second measurement time by an external operation. a power converting unit configured to charge a part of an input power input from an outside and converts a remainder of the input power into the power supplied to the calculation unit; and a first detection unit configured to compare a voltage of the input power with a threshold voltage and output a notification signal for notifying that predetermined power supply is not able to be performed in a case in which a time, over which a magnitude of the voltage has been lower than the threshold voltage, is detected to be over a first measurement time set in advance, the first detection unit is able to change a setting of the threshold voltage by an external operation, and characterised in that the calculation unit includes: a second detection unit configured to output an instruction signal for instructing an execution of pre-stop processing in preparation for stopping of the predetermined power supply in a case in which it is detected that a second measurement time set in advance has elapsed after receiving the notification signal; and a processing execution management unit configured to continue execution of the arithmetic operation process during the second measurement time and executes the pre-stop processing in place of the arithmetic operation process that is currently being executed after receiving the instruction signal, the second detection unit is able to change a setting of the second measurement time by an external operation. a second detection unit configured to output an instruction signal for instructing an execution of pre-stop processing in preparation for stopping of the predetermined power supply in a case in which it is detected that a second measurement time set in advance has elapsed after receiving the notification signal; and a processing execution management unit configured to continue execution of the arithmetic operation process during the second measurement time and executes the pre-stop processing in place of the arithmetic operation process that is currently being executed after receiving the instruction signal, the second detection unit is able to change a setting of the second measurement time by an external operation.