Priority control system, priority controller, and actuator

A priority control system for an operation target device, comprising:

• a plurality of operation devices configured to send operation request information designed to cause an operation target device to perform an action;
• a single or plurality of operation target devices configured to receive operation instruction information and to perform an action in response to the operation instruction information;
• a control device configured to receive the operation request information from at least one of the operation devices, to generate or not to generate the operation instruction information triggered by the reception of the operation request information, and, if the operation instruction information is generated, to send the generated operation instruction information to at least one of the operation target devices;
• and
• a communication mechanism configured to communicate the operation request information and the operation instruction information,
• wherein a specific operation device priority level is set to each operation device,
• wherein a dynamically variable operation target device priority level is set to the operation target device,
• wherein the control device is configured to refer to the operation device priority level and the operation target device priority level, and as a result of the reference, to generate or not to generate the operation instruction information and to retain or update the operation target device priority level
• wherein the control device is configured to determine whether the operation target device priority level is higher than the operation device priority level in response to the reception of the operation request information and, if the determination is true, to retain the operation target device priority level without generating the operation instruction information, and
• wherein the control device is configured to determine whether the operation request information is intended to stop the function of the operation target device and to determine whether the operation target device priority level is equal to or less than the operation device priority level, and, if the determinations are true, to generate the operation instruction information intended to stop the function and to update the operation target device priority level to a lowest level.