Patent ID: 7755507

Claim:
A distributed control system comprising: a plurality of control devices including a transmission side control device and a reception side control device; and a signal line for providing communication of data between the plurality of control devices, wherein: the distributed control system dispersively controls control targets of the plurality of control devices while serially-transmitting data through a pulse train signal via the signal line among the plurality of control devices; when a control target of a transmission side control device is normal, the transmission side control device transmits state quantity data representing a state quantity of the normal control target concerned to the reception side control device; when an abnormality occurs in the control target of the transmission side control device, the transmission side control device transmits abnormality data representing the abnormality concerned and the state quantity data alternately at a same period to the reception side control device in a predetermined order; the abnormality data is not transmitted when the control target of the transmission side control device is normal; and when an on-duty ratio or off-duty ratio of the pulse train signal is defined as a noted duty ratio, the noted duty ratio when the state quantity data is transmitted and the noted duty ratio when the abnormality data is transmitted are made different from each other in a predetermined range so as not to be overlapped.