Sequence controller

A sequence controller comprising a controller and a plurality of controlled devices that are connected in series to the controller, wherein

• the controller includes
• a first transmitting unit that transmits a first identification code provision start signal to all the controlled devices to simultaneously notify that provision of the identification code is started;
• and
• a second transmitting unit that transmits to a controlled device that is the first in the series a second identification code provision start signal to notify that provision of the identification code is started and an identification code provision end signal to notify that the provision of the identification code ends, and
• each of the controlled devices includes
• an identification code provision timing detecting unit that detects the first identification code provision start signal, the second identification code provision start signal, and the identification code provision end signal;
• an identification code providing unit that provides a predetermined number of identification codes to the controlled device on the basis of a header identification code that is determined by timings of the first identification code provision start signal and the second identification code provision start signal;
• and
• a third transmitting unit that transmits the second identification code provision start signal and the identification code provision end signal to a subsequent controlled device in the series.