Siemens SIMATIC HMI Operating Instructions Manual page 119

The method of holding the HMI device illustrated above enables you, for example, to move
around while servicing the system to be monitored.
NOTICE
Availability of the safety-related operator controls
If you are manually controlling potentially dangerous movements in the special operating
modes, you must use the above shown forearm holding method. Holding the HMI device so
that it is supported on your forearm in this way enables you, for example, to quickly reach
the emergency stop button or the enabling button in the event of a dangerous situation.
Availability of the enabling button and emergency stop button
The HMI device is equally easy to hold for right-handers and left-handers because it is
designed symmetrically. The free hand can be used to operate the operator controls on the
front side. The hand holding the HMI device can also be used to activate the enabling button.
The acknowledgment of the control input is also given if you only press one of the enabling
buttons.
The enabling button is required to confirm axis movements, for example. The enabling
button is optimally accessible. The enabling button triggers a safety shutdown in the event of
a panic reaction to danger (release or cramping).
The emergency stop button can also be quickly reached with your free hand.
Holder for the HMI device
NOTICE
Operability of the emergency stop button impaired
If the HMI device is hooked into an unsuitable wall holder, the operability of the emergency
stop button can be impaired.
Mobile Panel 277F IWLAN
Operating Instructions, 12/2007, A5E01003940-01
Operator controls and displays
5.8 Holding the mobile panel and fixing it to the wall
119