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Limit Programs
volts could fail to trigger a limit action if no history file has been established, or if the history file
contains a reading greater than or equal to the critical point.
Two traps may be used to prevent these
problems.
If no history file is present and the measurement is above the critical point, the limit action
could be executed anyway. Another test of I.» 1 at line 95 would do this. The second solution is to use
the history file technique in a custom program that acquires the data originally, and perform limit actions
there.
CAUTION |
There are three things that a limit program should never do:
oe The limit program should not alter HP-71 system flags or use flags O through 10. These flags
are used for monitoring the status of the event scheduler in the MIMI TOR and LOG
programs, as well as other functions. Flags 11 through 63 are available for use.
e¢ The limit programs should not use system timers #1 and #2. Timer #3 is available for use.
e The limit programs should not alter setup or data files being used by the calling program.
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