This paper summarizes experiences from independent HIL testing of DP system software on more than 80 DP drilling, shuttle tanker, supply, anchor handling, construction and special purpose vessels. The paper includes examples of typical findings and a comprehensive analysis of finding statistics. The analysis shows how errors and weaknesses in core software and system configuration are distributed on the different functions in the DP system, as well as the potential consequence these errors could have had if they had not been identified and solved through early testing. The presented experiences demonstrate that independent testing of control systems using HIL testing technology is an important and effective service to ensure safe and reliable operation of offshore vessels.

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