Siemens SIMATIC HMI 177 Operating Instructions Manual page 50

Operator elements and displays
5.1 Mobile Panel
Switch settings
The primary function of the evaluating logic is to recognize the three switch settings:
Figure 5-3
When the enabling switch is activated, the following switch sequences are possible:
Normal activation
Figure 5-4
Panic activation
If the operator has pressed the enabling switch through to the "Panic" setting, the "Enable"
setting will be skipped when the switch is released.
Figure 5-5
The signals of the enabling switch are fed to the terminal box via the connecting cable. For
manual special operating modes, these signals must be interconnected from the terminal
box to the safety circuit using two channels for power interruption.
5-4
Switch setting
1
2
3
Switch settings of enabling switch
Interlinking of switch settings for normal operation
Interlinking of switch settings for panic activation
Function
Neutral position
Enable
Panic
Enable switch
Not activated
Activated
Pressed
Mobile Panel 177 (WinCC flexible)
Operating Instructions (Compact), Edition 07/2005
Switch state
OFF (open)
ON (closed)
OFF (open)