Overview and definition of terms
1.6 Safety-oriented operator controls
Fail-safe operation of the Mobile Panel 277F IWLAN
Function Manual, 08/2008, 6AV6691-1FQ01-2AB0
21
Due to its position, the emergency stop button is equally accessible for both left-handed and
right-handed individuals.
Due to its profiled design, the emergency stop button is easily accessible. A collared
enclosure is used to protect the operator controls against damage. This applies in particular
to the emergency stop button The emergency stop button may still trigger if the HMI device
falls and hits the floor.
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
WARNING
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.
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.
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.
See also
Safety functions of the emergency stop button (Page 37)
S7 Distributed Safety (Page 58)
