SII (Systems Interface Inc) was founded in 1984 to furnish control systems for industrial manufacturing and consumer product companies. Our focus is the application and utilization of programmable logic controllers (PLC) and PC computer technology. We offer UL508, ETL, UL 698A & B panel fabrications per customer drawings or via our design engineering services. We provide clients with "best value" solutions engineered from decades of industry experience. Our customer base is both nation, and world wide, with the vast majority of our customers are repeat customers Systems Interface Inc is Licensed in the State of Washington to provide Consulting and Professional Engineering Services to our clients. License #1135. Systems Interface Inc is a Licensed General Construction Contractor in the State of Washington. License #CC01 SYSTEII081B7.