Cause : SIMOLINK start alarm comes when start of the SIMOLINK ring is not functioning. This alarm signifies an issue with the communication link between a Masterdrive unit and a Slave drive unit within a SIMOLINK multi-drive configuration.

The A002 fault in siemens master drive indicates a SIMOLINK start alarm. This alarm signifies an issue with the communication link used for starting the drive through an external control system (e.g., PLC) via the SIMOLINK protocol.

1. Check the fiber-optic cable ring for interruptions.
2. Check whether there is an SLB without voltage in the ring.
3. Check whether there is a faulty SLB in the ring.