Siemens SIMATIC HMI Operating Instructions Manual page 124

Operator controls and displays
5.9 Charging station
Procedure for unlocking the charging station
Proceed as follows:
1. Insert the key into the lock barrel.
2. Turn the key by 90 degrees.
3. Slide the lock upwards.
Result
You can now remove the HMI device.
See also
Charging station (Page 22)
124
Mobile Panel 277F IWLAN
Operating Instructions, 12/2007, A5E01003940-01