Siemens SIMATIC HMI Operating Instructions Manual page 74

Installation and connection
4.7 Connecting the HMI device
CAUTION
Damage to the HMI device
When the connection bay is open the HMI device is vulnerable to damage from mechanical
influences and live parts. If a bridging battery is fitted in the HMI device or the tabletop
power supply unit is connected, some parts of the HMI device will still be electrically live.
Please observe the following:
If you have connected a tabletop power supply unit, isolate the unit from the HMI device if
possible.
CAUTION
Damage to the HMI device
When the connection bay is open the HMI device is vulnerable to damage from electrostatic
discharge.
ESD
When working in the open housing, ensure that current-carrying conductors do not come
into contact with electrical circuits.
Note the ESD instructions.
1. Remove the main battery (if fitted) using the ribbon.
2. Unscrew the six screws approximately 1 cm out of the cover.
3. Open the cover.
Result
The connection bay is open.
74
The bridging battery and the memory card, if fitted, are now visible.
The cover is designed in such a way that the screws cannot be lost.
Mobile Panel 277F IWLAN
Operating Instructions, 12/2007, A5E01003940-01