Siemens Second Wind Function Manual page 23

● Panic: The "Panic" switch setting is reached as soon as one of the two enabling buttons
You only have to activate one enabling button. The PLC gets the same signal regardless as
to whether one or two enabling buttons of the Mobile Panel 277F IWLAN have been
pressed.
Note
The enabling button and the membrane keyboard can be operated at the same time.
When using the enabling button the following F FBs must be linked in the safety program of
the F CPU:
● F_FB_MP
● F_FB_RNG_n
Switch settings
The following figure shows the switching sequence for enable.
The following figure shows the switching sequence during panic usage.
If the operator has pressed the enabling button through to the "Panic" setting, the "Enable"
setting will not be evaluated when leaving the panic setting. A new enable can only be
triggered by releasing the enabling button.
See also
Safety functions of the enabling button (Page 39)
S7 Distributed Safety (Page 58)
Fail-safe operation of the Mobile Panel 277F IWLAN
Function Manual, 08/2008, 6AV6691-1FQ01-2AB0
is fully pressed. The switch setting of the other enabling button is unimportant in this
case. The "Panic" switch setting has the same effect as releasing the enabling button,
namely, it revokes the enable.
Overview and definition of terms
1.6 Safety-oriented operator controls
23