February 2012 23 – 377
Potentiometer
values in
the integrated
oscilloscope
You can also use the integrated oscilloscope to record the states of PLC operands.
The advantage of this method is that possible interruptions of the potentiometer wipers can be
detected more easily than in the PLC TABLE.
Proceed as follows:
8 Switch on the machine.
8 Press the EMERGENCY STOP button.
8 Call the oscilloscope. --> See ”Integrated oscilloscope” on page 10 – 95.
8 Make the following settings:
8 Start recording.
8 Turn the potentiometer to be examined.
8 Stop recording and adjust the signals.
8 Restart recording. --> Now you can examine the wiper areas of the potentiometers.
8 Check, whether the signal of the potentiometer wiper can be changed continuously, or whether
it "breaks off" suddenly.
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