Siemens SIMATIC HMI Operating Instructions Manual page 101

should fall down, the emergency stop button will not be activated. However the emergency
stop button is extensively protected against damage.
Operation
The operator triggers the emergency stop by pressing the emergency stop button. The
emergency stop button engages in the emergency stop position.
Releasing the emergency stop button
If you have activated the emergency stop button and thereby brought the configured
system to a standstill, the emergency stop button should only be released under the
following conditions:
• The reasons for the emergency stop have been eliminated.
• A safe restart is possible.
• The restart should not be executed by releasing the emergency stop button.
In order to release the emergency stop button, turn it in a clockwise direction. The
emergency stop button then returns on its own to the initial position.
NOTICE
The emergency stop button can be triggered unintentionally
The emergency stop button is evaluated under the following conditions:
• The Mobile Panel 277F IWLAN is integrated in the safety program of the F CPU.
The emergency stop button can be triggered unintentionally in the following cases, and
bring the configured system to a standstill:
• If the HMI device falls down
• When opening one of the coverings on the rear of the HMI device
Non-functional emergency stop button
The emergency stop button is only effective if the HMI device is in the charging station or if
is operated with the battery.
Do not operate the HMI device in the plant with the table power supply unit.
Mobile Panel 277F IWLAN
Operating Instructions, 12/2007, A5E01003940-01
WARNING
The operator must strictly ensure that he executes a separate operator action to
commence the restart. The safety program must ensure that release of the emergency
stop button alone does not trigger an automatic restart of the system.
WARNING
Operator controls and displays
5.4 Safety-related operator controls
101