Component mounting system and component mounting method in component mounting system

A component mounting system, comprising:

• a component mounting line formed by linking a plurality of component mounters which pick up components supplied to component supply positions by tape feeders disposed on a carriage, and mount the components onto a board using a suction nozzle which is attached to a mounting head;
• an external set-up device to which the carriage scheduled to be attached to one of the component mounters of a set-up changing target is attachable;
• and
• a storage,
• wherein the external set-up device includes
• a first imaging device which images the component supply positions of the tape feeders disposed on the carriage, and
• a calculator which calculates a shift amount of each of the component supply positions of the tape feeders based on an image of each of the component supply positions which is captured by the first imaging device,
• wherein the storage stores supply position shifting data in which the shift amount of each of the component supply positions of the tape feeders calculated by the calculator is related to a feeder address and a feeder ID of each of the tape feeders, and
• wherein the one of the component mounters which is the set-up changing target includes
• a second imaging device which images the component supply positions of the tape feeders disposed on the carriage which is removed from the external set-up device and is attached to the one of the component mounters which is the set-up changing target, and
• a comparator which, for every feeder address, compares the feeder ID of each of the tape feeders disposed on the carriage with the feeder ID included in the component supply position shifting data which is read from the storage.