Dortronics Systems announces that its 48900 PLC interlock Controller is a highly effective and cost-efficient solution to properly sequence and help maintain sterile operating conditions in interlocked areas with up to 9 doors. The 48900 series is a fully integrated single-board access control solution that provides installers with complete control of all operating and configuration options without challenging and complex software or programming. The simplicity and flexibility of this door solution makes it a perfect option for cleanrooms and biolabs.