Cimplicity 8.5
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.
While stable, version 8.5 lacks several modern expectations: cimplicity 8.5
CIMPLICITY 8.5 uses a client-server model: If your facility runs GE Series 90-30 PLCs
| Component | Description | |-----------|-------------| | Server | Manages I/O communication, points (tags), alarms, events, and data logging. | | Viewer | The runtime HMI client displaying screens, trends, and alarms. | | Workbench | The development environment for project configuration (screens, points, logic). | | WebServer | Optional component for browser-based access to HMI screens. | While stable, version 8
Communication protocols supported:
Based on thousands of forum posts and support tickets, here are the top fixes for 8.5 headaches.
| Symptom | Likely Cause | Solution |
| :--- | :--- | :--- |
| Viewer crashes on open | Corrupt Screen.wct file | Delete the screen cache; reopen from Config. |
| PLC goes "Bad Quality" | Mismatched update rate (Fast poll) | Increase "Timeout" in I/O driver properties; check physical cable. |
| Alarms not logging to SQL | 64-bit vs 32-bit ODBC mismatch | Ensure you configure the 32-bit ODBC (%windir%\SysWOW64\odbcad32.exe). |
| WebViewer blank screen | IIS Application Pool stopped | Start "CimWebPool" and ensure .NET 4.5 is registered. |
| Script error #430 | Class not registered in BCE | Re-register cimsvc.dll via command line. |