Evaluating Operator Control Elements As Direct Keys - Siemens SIMATIC HMI 177 Operating Instructions Manual

Appendix
A.2 Evaluation of the operator control elements
A.2.2

Evaluating operator control elements as direct keys

Introduction
You can configure the operator control elements of the HMI device as direct keys.
Direction pulses of the handwheel and the switch state of the softkeys, key-operated switch,
or illuminated pushbutton are then directly available in the I/O area of the PLC.
Byte assignment
The following figure shows the byte assignment in the I/O area for the operator control
elements of the HMI device.
Figure A-1
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Byte assignment of the keys and LEDs in the I/O area of the PLC
Bit for softkey
Bit for key-operated switch
Bit for illuminated pushbutton
Bit for handwheel pulses, forwards
Bit for handwheel pulses, backwards
Mobile Panel 177 (WinCC flexible)
Operating Instructions (Compact), Edition 07/2005