PROFINET distinguishes several alarm types: "Process Alarms" (application events raised by the device), "Diagnostic Alarms" (detected hardware anomalies) and "Maintenance Alarms" (preventive maintenance needs).
True
The PROFINET alarm catalogue is: Process Alarm for application-level events (setpoint exceeded, process cycle complete, application-level safety trigger); Diagnostic Alarm for hardware faults (sensor break, short-circuit, overheating); Maintenance Required / Maintenance Demanded as proactive indicators (operating hours, cycles reached); and Plug / Pull alarms for hot insertion or removal of modules. All of these reach the PLC via the AlarmCR and can trigger dedicated handling routines.
Keep Process Alarms separate from Diagnostic Alarms in your PLC code: a measurement out of range is a process matter that needs operator notification, not a hardware fault that requires a maintenance ticket.
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