Control system and functional unit

A functional unit that operates on the basis of predetermined setting information, the functional unit comprising:

• a communication control unit that controls communication with a controller communicatively connected to another functional unit and a storage unit;
• an input portion that receives a user operation;
• and
• a generation unit that generates a command for executing at least one of a process of loading the setting information of a specific one or each of a plurality of functional units into the storage unit and a process of reading the setting information from the storage unit as an access process when the input portion receives execution of the access process for accessing the storage unit from the specific one or the plurality of functional units according to the user operation,
• wherein when the generation unit generates the command, the communication control unit transmits the command to a second functional unit designated according to the user operation received by the input portion.