Interlocked doors in mantrap areas can be equipped with LED traffic lights for user feedback. Indicators for normally unlocked doors will always follow the door lock status (green when unlocked and red when door is locked to prevent access.) “Go / No Go” lights indicate when normally locked doors are inhibited or are available for access.
Access control is a complex requirement of the cleanroom environment in order to ensure the integrity of processes that take place there. PLC-based interlock controllers simplify the critical task of providing access control in these specialized environments.
Bryan Sanderford is national sales manager, Dortronics Systems, Inc. For more information, visit www.dortronics.com.