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How to increase Client update rate?

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27 Jun 2021 08:50 #9822 by support
Thanks for letting me know. I was about to reply and, also include a suggestion to use subscriptions.

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27 Jun 2021 03:59 #9820 by B351
I have switched to using SubscribeMultipleItems and was able to set the update rate to a suitable value for my application.

Consider this issue resolved

Thank you

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26 Jun 2021 03:57 #9814 by B351
If I call ReadPLC2 every 200 ms I get results like this
gd200 36288
gd200 36007
gd200 36007
gd200 36007
gd200 36007
gd200 36277
gd200 36007
gd200 36007
gd200 36007
gd200 36007
gd200 36267
gd200 36007
gd200 36007
gd200 36007
gd200 36007
gd200 36257

The real value of gd200 is only changing on every 5th read , otherwise the value that was first read by the control is retrieved.
If I call readPLC2 every second I get results like this

gd200 40537
gd200 40527
gd200 40517
gd200 40506
gd200 40496
gd200 40485
gd200 40475

The value retrieved is updated correctly

It seems that the client is only updating values every 1000ms
The server is updating every 50ms and if I use the quick client that comes with the server I can see that the results update as expected.

Could you provide a VB6 example of how to change the update rate?
Thank you

Code is below




Public E As OpcLabs_EasyOpcClassic.DAGroupParameters
Public gClient As EasyDAClient


Public Sub Init()
Set gClient = New EasyDAClient
Set E = New OpcLabs_EasyOpcClassic.DAGroupParameters
ReDim gPLCRead(0)
End Sub



Public Sub ReadPLC2()
Dim vVal As Variant
Static bOSR As Boolean
If Not bOSR Then
E.requestedUpdateRate = 100
bOSR = True
End If

vVal = gClient.ReadItemValue("", "SWToolbox.TOPServer.V6", "OM_NJ.PLC.gd200")

gPLCRead(0).lVal = CLng(vVal)
gPLCRead(0).sAddress = "gd200"
End Sub

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