Siemens SIMATIC HMI, Руководство по эксплуатации

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Operator controls and displays
5.5 Operator controls
Mobile Panel 277F IWLAN
108
Operating Instructions, 12/2007, A5E01003940-01
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F Bit for function key
S Bit for key-operated switch
T1 Bit for left illuminated pushbutton
T2 Bit for right illuminated pushbutton
I Bit for handwheel pulses, forwards
D Bit for handwheel pulses, backwards
The bytes "n+6" to "n+9" contain the direct key bits for the touch buttons.
Bit coding
The following tables show the bit coding for function keys, key-operated switch, illuminated
pushbutton and handwheel:
● Bit coding of function keys
State F1 to F18
Not pressed 0
Pressed 1
● Bit coding of function key LEDs
State F1 to F18
LED not illuminated 0
LED is illuminated 1
● Bit coding of key-operated switch
State S1 S0 Key position
Position 0 0 0 In middle position
Position I 0 1 Turned in clockwise direction up to stop
Position II 1 0 Turned counter-clockwise up to stop
● Bit coding of illuminated pushbuttons