Alarms - Siemens SIMATIC TP 270 Operating Instructions Manual

Runtime functionalities of a project

8.2 Alarms

8.2 Alarms
Alarm classes
Alarms indicate events and states in the control process on the HMI device. WinCC flexible
distinguishes the following alarm classes:
• Operation
• Fault
• System
• STEP 7 alarm classes
• Custom alarm classes
Alarm buffer
All incoming, outgoing and acknowledged alarm events are logged to an internal volatile
buffer memory. The size of this alarm buffer depends on the type of HMI device.
Alarm protocol
When alarm logging is activated, alarm events are printed out directly on the printer.
You can individually configure each alarm to be printed out.
Alarm log
Alarm events are stored in an alarm log if one is configured. The log file capacity is limited by
the storage medium and system limits.
Alarm view
Events stored in the alarm buffer and the alarm log file can be output to the alarm screen in
runtime.
The alarm view is used to indicate process alarm events. Whether alarm events need to be
acknowledged or not is defined in your configuration data.
8-2
Warning alarms indicate a process status, e.g. motor is ON. Warning alarms are
configured.
Error alarms indicate operational errors such as excess motor temperature. Error alarms
are configured. These are high-priority alarms and must therefore be acknowledged.
System alarms are triggered by the HMI device. They are not configured. System alarms
provide information on operator errors or communication faults.
The alarm classes configured in STEP 7 are also available for the HMI device.
It is possible to configure additional alarm classes.
TP 270, OP 270, MP 270B (WinCC flexible)
Operating Instructions, Edition 03/2004, 6AV6691-1DD01-0AB0