Cimplicity 8.5 -

is a classic workhorse—reliable, proven, and deeply integrated with legacy GE hardware. However, its reliance on outdated operating systems and insecure DCOM protocols means it should be air-gapped or placed on a strictly isolated OT network if used today. For greenfield projects, it is obsolete; for brownfield maintenance, it remains a necessary and functional reality.

If your facility runs GE Series 90-30 PLCs (which are obsolete but still in use), CIMPLICITY 8.5 is the last version with native full-tested support. Newer versions often emulate this, causing scan rate jitter. cimplicity 8.5

As of 2025, GE Digital (now part of Emerson Electric after the 2024 acquisition) supports CIMPLICITY up to version 2024. If you are still on 8.5, you face several risks: is a classic workhorse—reliable