Specifications

TRIGger
The TRIGger command subsystem controls the behavior of the trigger system once
it is initiated (see INITiate command subsystem).
Figure 6-5 shows the overall Trigger System model. The shaded area shows the
ARM subsystem portion.
CAUTION!
·
Algorithms execute, at most, once per trigger event. Should trigger events cease
(external trigger source stops) or become ignored (TRIGger:COUNt reached),
algorithm execution will stop. In this case, control outputs are left at the last value
set by the algorithms. Depending on the process, this uncontrolled situation could
be dangerous. Make certain that the process is in a safe state before halting (stop
triggering) execution of a controlling algorithm.
·
The Agilent/HP E1535 Watchdog Timer SCP was specifically developed to
automatically signal that an algorithm has stopped controlling a process. Use of
the Watchdog Timer is recommended for critical processes.
VT1419A Command Reference
TRIGger
Chapter 6 305
Figure 6-5: Logical Trigger Model
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