VXI VT1422A, User Manual

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Glossary 481 Appendix D
Swapping This term applies to algorithms that are enabled to
swap. These algorithms can be exchanged with
another of the same name while the original is
running. The "new" algorithm becomes active
after an update command is sent. This "new"
algorithm may again be swapped with another
and so on. This capability allows changing
algorithm operation without stopping and leaving
this and perhaps other processes without control.
Terminal Blocks The screw-terminal blocks connected to the
system field wiring. The terminal blocks are
inside the Terminal Module.
Terminal Module The plastic encased module which contains the
terminal blocks connected to the field wiring. The
Terminal Module then is plugged into the
VT1422A's front panel.
Update This is an intended change to an algorithm,
algorithm variable or global variable that is
initiated by one of the commands
ALG:SCALAR, ALG:ARRAY, ALG:DEFINE,
ALG:SCAN:RATIO, or ALG:STATE. This
change or "update" is considered to be pending
until an update command is received. Several
updates can be sent to the Update Queue, waiting
for an update command to cause them to take
effect synchronously. The update commands are
ALG:UPDATE and ALG:UPD:CHANNEL.
Update Queue A list of scalar variable values and/or buffer
pointer values (for arrays and swapping
algorithms) that is built in response to updates
(see Update). When an update command is sent,
scalar values and pointer values are sent to their
working locations.
User Function A function callable from the Algorithm Language in
the general form <
function_name > ( < expression > ) .
These user defined functions provide advanced
mathematical capability to the Algorithm Language.