Control system, control device, and non-transitory computer-readable recording medium recording program

A control device that controls a target, comprising:

• a part for communicating with a network that communicably connects a plurality of the control devices;
• a timer that manages time having an accuracy;
• a communicator for transmitting a control command to the target corresponding to the control device with the time managed by the timer as a reference;
• and
• a timer synchronizer for, when the control device communicably connected to the network is changed, time-synchronizing, among timers of the plurality of respective control devices connected to the network after the change, other timers with a timer having a higher time accuracy than time accuracies of any of the other timers.

A non-transitory computer-readable recording medium, recording a program causing a computer to execute a method of synchronizing time with a control device that controls a target, the control device comprising:

• a part for communicating with a network that communicably connects a plurality of the control devices;
• a timer that manages time having an accuracy;
• and
• a communicator for transmitting a control command to the target corresponding to the control device with the time managed by the timer as a reference,
• the method comprising:
• a step of, when the control device communicably connected to the network is changed, detecting a timer having a higher time accuracy than time accuracies of any of other timers among timers of the plurality of respective control devices connected to the network after the change;
• and
• a step of time-synchronizing the other timers with the timer having the higher time accuracy.