Evaluation Of The Handwheel With System Functions - Siemens SIMATIC HMI Operating Instructions Manual

● On
You can use the LED to signal to the user that a function key should be pressed, in a running
project.
Bit assignment
The following table shows the possible states of the LEDs and the corresponding entries in
bit n+1 and bit n of the LED tags.
5.5.4.4

Evaluation of the handwheel with system functions

Application
The handwheel is an optional operator control of the HMI device. You can enter incremental
values in a running project with the handwheel.
Note
Do not configure limit values in WinCC flexible for tags assigned to the handwheel.
Evaluation of the incremental values
If the signals of the handwheel are assigned to a WinCC flexible tag, then the forward and
backward increments will be set off against each other. The absolute value of the increments
is given. The maximum or minimum value of the increments until an overflow depends on the
type of tags assigned.
A complete handwheel revolution yields 50 pulses. The rotary pulse encoder supplies a
maximum of 200 pulses per second.
Example
● The handwheel has a starting value of 120 increments.
● You rotate the wheel 10 increments forwards and 3 increments backwards.
Mobile Panel 277F IWLAN
Operating Instructions, 12/2007, A5E01003940-01
Bit n+1
0
0
1
1
This results in a new value of 127 increments.
Operator controls and displays
Bit n LED status
0 Off
1 Flashing quickly
0 Flashing slowly
1 ON (continuous)
5.5 Operator controls
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