11 – 126 HEIDENHAIN Service Manual iTNC 530
Start of recording
8 Call LOGIC DIAGRAM again.
8 Start the LOGIC TRACE function.
8 Display the Machine mode on the iTNC monitor (key on visual display unit).
PCTR blinking: Trigger condition has not yet arrived
PCTR not blinking: Trigger condition has arrived, buffer is written
PCTR not lit: Buffer full, LOGIC DIAGRAM can be called
The logic states of up to 16 operands (M,I,O,T,C) can be displayed at the same time. A maximum
of 1024 PLC cycles are traced.
Figure: Recording of PLC markers during spindle orientation
The trigger event is displayed on the left edge of the display with the PLC cycle 0.
It is possible to shift the logic diagram -512 PLC cycles to the left and +512 PLC cycles to the
right.
A recording begins with START LOGIC TRACE and ends with STOP LOGIC TRACE soft key
with the arrival of a trigger event.
During the recording, tracing ... appears over the logic diagram.
If the screen displays a machine operating mode, the signal word PCTR is shown during the
recording.
The distance of two narrow bars in the upper line describes the duration of one PLC cycle.
According to this, the distance of two thicker bars describes the duration of 5 PLC cycles.
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