in reponce to your question.
An RP FAULT alarm is received in the following cases:
1. When a fault in a Regional Processor (RP) is detected
2. When there is a fault in the application, connected to the RP (if the application supports this function)
3. When a recovery attempt is made of an RP, located in a magazine which is adapted to the Regional Processor Bus of Serial type (RPB-S), and where the magazine has no valid address