Cause : Sign-of-life error in safety data comes when the drive-integrated "Safety Integrated" function on processor 2 has detected an error in the sign-of-life of the safety data and initiated a STOP A.

- there is a communication error between processor 1 and processor 2 or communication has failed.
- a time slice overflow of the safety software has occurred.

1. select Safe Torque Off and de-select again.
2. carry out a POWER ON (power off/on).
3. check whether additional faults are present and if required, perform diagnostics.
4. check the electrical cabinet design and cable routing for EMC compliance.