ConveyLinx Modules will automatically detect that a given carton is longer than one zone length and automatically adjust accumulation control so that the longer carton occupies two logical zones and will keep the next upstream carton from conveying into the longer carton.

All 3 Cartons are accumulated and the Zone at PE3 has Flex Zone enabled
Carton 1 Releases – Even though PE3 is clear, because it has Flex Zone enabled, Carton 2 remains accumulated
When Carton 1’s leading edge reaches PE1, Flex Zone is cleared from the Zone at PE3 and Carton 2 releases

How to disable Flex Zone operation with EasyRoll