Control system, industrial device, control method, and program

A control system, comprising:

• a plurality of industrial devices each belonging to at least one communication domain of a plurality of communication domains set in a same industrial communication network such that industrial devices belonging to a same communication domain communicate with each other, wherein a first industrial device of the plurality of industrial devices belongs to both a first communication domain and a second communication domain of the plurality of communication domains, and a second industrial device of the plurality of industrial devices belongs to the first communication domain and does not belong to the second communication domain of the plurality of communication domains,
• wherein at least one industrial device of the plurality of industrial devices includes processing circuitry configured to
• store domain information indicating whether or not the at least one communication domain to which the at least one industrial device belongs is a secure domain in which secure communication is performed,
• perform security processing related to the secure communication when the domain information indicates the secure domain, and
• perform the secure communication based on the security processing, and
• wherein the processing circuitry is configured to generate source data of data to be communicated independent of whether the data to be communicated is designated for communication in the secure domain.