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Setting up the Trigger System
Arm and Trigger
Sources
Selecting the
Trigger Source
82 Programming the HP E1415 for PID Control
(FIFO mode OVER)" on page 90.). This mode is very useful when
you want to view an algorithm's response to a disturbance. Run the
algorithm with History_mode set to 1. Disturb the loop with a step
change. Stop the algorithm with the ABORT command. The FIFO
records the latest 13,004 5-value entries from a PIDB.
To set the FIFO mode (blocking is the *RST/Power-on condition):
[SENSe:]DATA:FIFO:MODE OVERWRITE select overwrite mode
[SENSe:]DATA:FIFO:MODE BLOCK
Figure 3-7 shows the trigger and arm model for the HP E1415. Note that
when the Trigger Source selected is TIMer(the default), the remaining
sources become Arm Sources. Using ARM:SOUR allows you to specify an
event that must occur in order to start the Trigger Timer. The default
Arm source is IMMediate (always armed).
In order to start an algorithm execution cycle, a trigger event must occur.
The source of this event is selected with the TRIGger:SOURce <source>
command. The following table explains the possible choices for <source>.
select blocking mode
Figure 3-7. Logi
Chapter 3
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