Abstract
The Shaft Driven Generating System goes a long way toward energy saving, space saving and labor saving on ships. For this reason, it has been used on many ships, and there have been strong requests for increased Reliability Availability and Serviceability. In order to meet the above demands, we have developed a new Shaft Driven Generating System that uses *Direct Digital Control* and *Fault Diagnosis Function*. This system consists of *Original Microcomputer module* and *Programable Controller (PLC)*.