In LabVIEW 5.1 (on WinXP), I am writing a VI to run a feedback loop. The main part of this loop is a While loop. Into this While loop I have five values using shift registers. All of the shift registers are initialzed by values from indicators. All of the five values get used in Matlab script nodes (Maltab 6.1, and I have the dll patch to allow these to work together). Three (A, B and C, INT32 values) are input into the first Matlab node, and then are output with the same names. Then these three, together with the other two shift register values (D and E, DBL values), are input into a second Matalb script node. All five are then output from this node, again keeping the same names, and into the s
hift registers for reuse in the next loop cycle.
During the running of this particular VI, two of the five values (D and E) always retain their intialized values. This is very strange. One of these is changing in a very simple way (being multiplied by a constant) so there is no problem with the change being made. I have run tests with smaller, almost identical VIs doing very similar things, and there the shift registers act as described in the manuals. Are there any reasons why these two shift registers would keep reinitializing themselves?
There are no other loops or structures encompassing the While loop, it is stand-alone.
