OPC Write

[Keele]

I'm using LabVIEW 8.6 with DSC module. I build the OPC server link to my Siemens S7-200 PLC, by using the I/O server build a OPC client to interface.

I create 2 tag for testing my application :-

1. Direct read input from the PLC

2. Direct write to the PLC output

For the input I success get the result from PLC input and updated to my front panel.

For the output, I create a control at front panel and link to the variable, but the control result did't respond to my output.

* no error occur when running

* link interface is correct checking by using 'NI Distributed System Manager' at tool menu

* I try using "PC Access OPC server" & "KEPServerEX (KEPware) OPC Server" but get same result can't write

[unclebump]

Did you setup the second item to have read/write access?? Sometimes the default is to read only.

[Keele]

Yes, already choose to the read/write type.

[Keele · Accepted solution]

It's event-base triggering, using event to trigger it.

[bikarna.pokharel@student.hamk.fi]

what does event base triggering mean? And how to do it?

[gohk]

Are you using UA or Clasic OPC ?