This controller system includes: a program acquisition unit that acquires, by turning on the controller system, a control program from a server in which the control program is stored; a main storage device that stores the control program acquired by the program acquisition unit while electric power is supplied to the controller system; and a program execution unit that executes the control program stored in the main storage device.

This controller system includes: a program acquisition unit that acquires, by turning on the controller system, a control program from a server in which the control program is stored; a main storage device that stores the control program acquired by the program acquisition unit while electric power is supplied to the controller system; and a program execution unit that executes the control program stored in the main storage device.