Slave device, master device, and industrial network system

A slave device, which is related to an end effector replacement in which an end effector before replacement is removed from the slave device and an end effector after replacement is mounted on the slave device, comprising:

• a processor being configured to,
• communicate with the end effector after replacement mounted on the slave device after the end effector replacement;
• store, with regard to each of a plurality of attachable end effectors that are attachable to the slave device, communication information related to a communication form between the slave device and the attachable end effector;
• and
• automatically change a communication setting in the processor according to the communication information which corresponds to the end effector after replacement in a timing of the end effector replacement when the end effector after replacement is one of the plurality of attachable end effectors,
• the processor is further configure to control priority of tasks for the communication setting, and
• when the time for changing the communication setting in the processor is longer than the time required for the movement of the slave device conducted in the end effector replacement, the processor raises the priority of the tasks for the communication setting.