used for programming older Modicon Quantum and Momentum PLCs. Official downloads for this software are no longer hosted by Schneider Electric.
Use Control Expert. However, if you must open a 20-year-old Quantum project, Concept 2.6 is irreplaceable. -UPDATED- Download Concept 2.6 Plc Software
: Open the folder and run Setup.exe as an Administrator. Schneider Electric Concept 2
Windows (typical):