Siemens SIMATIC HMI Operating Instructions Manual page 72

Installation and connection
4.7 Connecting the HMI device
CAUTION
Shutdown or rampdown of the system
When you open the connection bay, you remove the main battery. This failure of the main
battery is bridged by the bridge battery, if fitted. The maximum buffer time is 5 minutes. If
you exceed the buffer time, the HMI device will switch off. If the HMI device has been
integrated, this will lead to a shutdown or rampdown of the system.
Do not exceed the buffer time!
Requirements
Cross-head screwdriver, size 2
Battery compartment and connection bay
①
②
③
④
⑤
⑥
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Locking latch
Connection bay cover
Connection for tabletop power supply unit
Battery compartment cover
Charging contacts for charging station
USB interface
Mobile Panel 277F IWLAN
Operating Instructions, 12/2007, A5E01003940-01