pid set point

[maciek]

what is the best or easiest way to change the set point on a pid loop using a  hmi c more using brx plc

[franji1]

Are you using the Do-more Symbolic Driver?  You will need to export all the symbols from Designer (File->Export->Element Documentation...
Make sure you pick C-more driver WITH STRUCT FIELDS (3rd radio button), and CHECK the Also export USED elements which do not have nicknames below that radio button.

If you are using the regular driver, it only understands basic built in types (e.g. X, Y, C, R, D, etc.).  You would need to utilize an R register for your HMI to write to (say R42), then have a
MOVE R42 MyPID.SP
box.