F108-66
Internal processing fault in user program
SEW Eurodrive · MOVIDRIVE MDX60B/61B Variable Speed Drive
What does F108-66 mean?
An internal processing fault occurred within the user program on the DCS..B option. This indicates a problem with the custom logic or application running on the option.
Source: SEW Eurodrive MOVIDRIVE MDX60B/61B Variable Speed Drive
Open Manual (Page 208)