July 2013 9.1 PLC Functions 1681
The operands to be shown must be saved in a table that you create with the
SELECT M/I/O/T/C soft key. The iTNC asks per dialog for the individual
positions in the table. To delete the lines, simply press DEL.
For each operand you can enter one trigger condition. The iTNC records from
the trigger time for as long as it was instructed to. A total of 2048 PLC cycles
is always recorded, and depending on the setting, 128, 256, 512 or 1024 PLC
cycles from the trigger time. The appropriate cycles before the trigger time are
also shown.
The following trigger conditions are possible:
1: Record if operand is logically 1 (trigger on positive edge).
0: Record if operand is logically 0 (trigger on negative edge).
No trigger condition: Only record in combination with other triggers.
If you do not need a trigger condition, you can enter this in the Trigger column
with the CE key. The iTNC records the states of this operand in parallel with
the triggered operands.
To start recording:
Press the START LOGIC TRACE soft key.
To stop recording:
Press the STOP LOGIC TRACE soft key, or the iTNC terminates recording
automatically as soon as the trigger event occurs.
The "PCTR" indicator blinks in the status window as long as the iTNC is
recording logical states. As soon as recording ends, you can use the arrow
keys to select the desired area in the TRACE buffer.
Example of logic diagram:
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