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XCDX458000-00 rev A
19
Specifications
Figure 6: PPI Outputs
2.1.7
D
IGITAL
TRIGGERS
The XCDX Controller/Driver supports a TTL level digital trigger output signal
(selectable polarity) that can be programmed to provide a pulse at various
times during the execution of the stored program. The pulse is available on a
BNC connector (shell is ground). This signal can provide triggers from all 4
axes. The XCDX Motherboard combines (ORs) the 4 signals to create the
output signal. The trigger is programmable (Level, Axis in trigger, Pulse width)
Maximum delay from each axis output trigger to the XCDX output trigger is
less than 1
s. This corresponds to 100ns jitter.
Trigger generation
• Standard - a pulse is generated on position compare
• Extended - the output goes high when Position 1 is reached, and goes
low when Position 2 (> Position 1) is reached.
2.1.7.1
P
OSITION
P
ULSE
I
NCREMENTAL
(
PPI
)
The Incremental Position Pulse (ppi) allows for a position compare function for
an axis or between axes. This function provides for synchronizing motor/axis
position. The function is supported in XCD-HR hardware with a related delay
of 0.1
second.