PRODUCTION SYSTEM, HOST CONTROL DEVICE, CONTROL DEVICE, COMMUNICATION METHOD, AND PROGRAM

[Problem to be solved] To reduce communication cost when a host control device causes a control device to execute various processes.[Solution] In a production system (1), a control device (30) controlling at least one industrial device (40) and a host control device (20) capable of controlling the control device (30) are communicably connected. The host control device (20) includes: a register part (201) that has a register that is allocated for controlling the control device (30) and includes a command area; and a transmission part that transmits to the corresponding control device (30) multiple command data sets written in the command area. The control device (30) includes: a communication storage part (301) in which multiple command data sets received from the host control device (20) are written; and an execution part (302) that executes a process instructed by the host control device (20) based on the multiple command data sets written in the communication storage part (301).