Cause : Actual value synchronization not permissible comes when it is not permissible to enable actual value synchronization for a 1-encoder system.

- It is not permissible to simultaneously enable actual value synchronization and a monitoring function with absolute reference (SCA/SLP).
- It is not permissible to simultaneously enable actual value synchronization and safe position via PROFIsafe.

- Either select the "actual value synchronization" function or parameterize a 2-encoder system.
- Either de-select the function "actual value synchronization" or the monitoring functions with absolute reference (SCA/SLP) and carry out a POWER ON.
- Either deselect the "actual value synchronization" function or do not enable "Safe position via PROFIsafe"