11 Oscilloscope (continued)
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Example 3
A robot program branches to various subprograms depending on how the PLC sets specific
signals. In a certain, unknown situation, the program branches to the subprogram
“SP55.SRC”, which is not desired in this configuration, however.
For the purpose of checking the I/O communication of the robot program with the PLC in this
situation, an unassigned output (e.g. output 32) can be set in the subprogram SP55 and reset
again on quitting the subprogram.
A trace can now be triggered at this output and the recorded sequence of events saved.
Box Entry
Name T race3 (max. 7 characters)
Length of recording 12
Pre--Trigger (%) 90 (since the “pre--event history” is of interest)
T rigger on I/O state
I/O state $IN : 32 = TRUE
DSE card No DSE data
I/O group I/O
Interpolator data None
Test data No test data
Press the softkey “I/O Table” to open the selection box for the I/Os to be recorded and select
“Channels 1/2”. Channels 1--16 must now be defined as inputs and numbered accordingly
(1--16). Select Channels “3/4”, define channels 17--32 as inputs and number them (1--16).
Now start the motion program and then press the softkey “Start”.
Output “32” will now be monitored with regard to this trigger condition. The message
“#T_WAIT” is displayed in the box “Trace--status”. This message changes to
“#TRIGGERED” when the trigger condition is fulfilled. The signals for inputs and outputs
1--16 are then recorded for 10.8 seconds before the trigger moment and 1.2 seconds after
the trigger moment.
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