integral controller with shift registers

[oilyfingers]

I have a while loop for PI control and I want to add up the previous N error values to get a cumulative running total (integral) of error. I can do this with shift registers if I just want a few previous values - say 1, 2, 5 etc. But what if I want 100 or 1000? clearly shift registers are impractical. Any ideas?

[Norbert_B]

See attached VI

hope this helps,

Norbert 

[oilyfingers]

thanks for this, unfortunately I can't open it since it is 8.6 and I only have 8.5.1

dave