slow communication

[samihamid]

hello

  Am using lab veiw to connect PLC, the problem am facing was that boolean 1 button i press the boolean button 2 shows late result as shown in video attached

am using modbus tcp communication

boolean 1 is an start button

boolean 2 is an output of my controller, output result is good but the indication on labview is very slow

[GerdW]

Hi Sami,

the problem is either in your LabVIEW code or in the PLC code. You need to find for yourself!

Attaching a video to show a problem is nice. But it's senseless to (try to) debug code without code…

[samihamid]

please see attached files

[samihamid]

plc is giving instant output but this output indication on lab view is late as shown in video

On button (boolean 1) giving instant indication but the boolean 2 button (plc output indication) showing late result on labview

[GerdW]

Hi Sami,

I cannot open your LV2019 VI but I guess you are using some OPC connectivity option.

What do you think how fast is this communication? There's a lot of request-and-answer stuff done in the background - and this will not respond within milliseconds…

[samihamid]

hi

yes am using opc server

i think output indication on hmi comes 200 miliseconds late