Download TP 277, OP 277 (WinCC flexible) - Service, Support

Operating Alarms
Alarms indicate events and states on the HMI device which have occurred in the system, in
the process or on the HMI device itself. A status is reported when it is received.
An alarm could trigger one of the following alarm events:
• Incoming
• Outgoing
• Acknowledge
The configuration engineer defines which alarms must be acknowledged by the user.
An alarm may contain the following information:
• Date
• Time
• Alarm text
• Location of fault
• Status
• Alarm class
• Alarm number
• Alarm group
• Diagnostics capability
Alarm Classes
Alarms are assigned to various alarm classes:
• Error
Alarms in this class must always be acknowledged. Error alarms normally indicate critical
errors within the plant such as "Motor temperature too high".
• Operation
Warning alarms usually indicate states of a plant such as "Motor switched on".
• System
System alarms indicate states or events which occur on the HMI device.
TP 277, OP 277 (WinCC flexible)
Operating Instructions, 09/2007, 6AV6691-1DH01-0AB0