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3-3
Analog Output Triggering Signals
Analog output supports two different triggering actions: AO Start Trigger and AO Pause Trigger.
An analog or digital trigger can initiate these actions. Up to two C Series parallel digital input
modules can be used in any chassis slot to supply a digital trigger. An analog trigger can be
supplied by some C Series analog modules.
sections for more information
about the analog output trigger signals.
Analog Output Timing Signals
The cDAQ chassis features the following AO (waveform generation) timing signals:
•
•
AO Sample Clock Timebase Signal
•
•
Signals with an * support digital filtering. Refer to the
section of Chapter 4,
, for more information.
AO Sample Clock Signal
The AO sample clock (ao/SampleClock) signals when all the analog output channels in the task
update. AO Sample Clock can be generated from external or internal sources as shown in
Figure 3-1.
Figure 3-1.
Analog Output Timing Options
Routing AO Sample Clock to an Output Terminal
You can route AO Sample Clock to any output PFI terminal. AO Sample Clock is active high
by default.
Programmable
Clock
Divider
AO Sample Clock
Timebase
PFI
Analog Comparison Event
Ctr
n Internal Output
AO Sample Clock
Analog Comparison
Event
20 MHz Timebase
80 MHz Timebase
PFI
100 kHz Timebase
