Siemens SINUMERIK 840D sl Operating Manual page 210

Alarm, error, and system messages
9.1 Displaying alarms
Acknowledgement symbols
Symbol
210
1. Select the "Diagnostics" operating area.
2. Press the "Alarm list" softkey.
The "Alarms" window appears.
3. Position the cursor on an alarm.
...
4. Press the key that is specified as acknowledgement symbol to delete
the alarm.
- OR -
Press the "Delete HMI alarm" softkey to cancel an HMI alarm.
- OR -
Press the "Acknowledge alarm" softkey to delete a PLC alarm of the
SQ type (alarm number as of 800000).
The softkeys are activated when the cursor is on the corresponding
alarm.
Meaning
Turn the unit off and back on (main switch), or press NCK POWER ON.
Press the "RESET" key.
Press the "ALARM CANCEL" key
...
- OR -
Press the "Acknowl. HMI alarm" key.
Press the key provided by the manufacturer.
Machine manufacturer
Please refer to the machine manufacturer's specifications.
Operating Manual, 01/2008, 6FC5398-6AP10-2BA0
HMI sl Universal