LabWindows/CVI

cancel
Showing results for 
Search instead for 
Did you mean: 

OPC UA architecture

Even if the names are quite similar "OPC DA" is completely different from "OPC UA".

On NI website you can find some info on OPC UA, for example here.

For LabVIEW, DSC and Real-Time modules include "OPC UA" API.

 

Some years ago, Tomsaw asked about OPC UA interface in CVI (see here), but he didn't receive any detailed info.

 

Is there a way to develop "OPC UA" interface (client and server) with LabWindows/CVI?

I'm interested in NI or third-party modules or API.

 

Vix
-------------------------------------------
In claris non fit interpretatio

-------------------------------------------
Using LV from 7
Using LW/CVI from 6.0
0 Kudos
Message 1 of 53
(11,546 Views)

I suspect that OPC UA interface is not available for CVI... unfortunately.

But can someone from NI side answer to this question, please?

 

Thanks

Vix
-------------------------------------------
In claris non fit interpretatio

-------------------------------------------
Using LV from 7
Using LW/CVI from 6.0
0 Kudos
Message 2 of 53
(11,481 Views)

Hi Vix,

 

NI does not provide an OPC UA solution specific to LabWindows/CVI.

 

I'm curious, have you tried any of the open-source C solutions out there? In looking around, I saw this one ( http://open62541.org/ ) for example.

Daniel Dorroh
National Instruments
Message 3 of 53
(11,444 Views)

Hi Daniel,

I didn't know about open62541 project.

I'm going to looking to this solution deeply in the next few weeks to see if this library is useful to me.

 

Thanks for having found this project

Vix
-------------------------------------------
In claris non fit interpretatio

-------------------------------------------
Using LV from 7
Using LW/CVI from 6.0
0 Kudos
Message 4 of 53
(11,381 Views)

Hi Daniel,

after some months I've just started the test on open62541 library but the compilation fails:

  • under CVI 2010 SP1 it fails because of

#include <inttypes.h>
#include <stdbool.h>

The above files should be part of C99 extensions (supported by CVI 2010 SP1). I enabled C99 extensions but the compilation fails

  • under CVI 2015 the compilation fails because of

#include <malloc.h>

I'm not sure this is a standard-C library so I don't know if this is a problem of either CVI or open62541 library

 

Are the above failures expected under CVI?

Vix
-------------------------------------------
In claris non fit interpretatio

-------------------------------------------
Using LV from 7
Using LW/CVI from 6.0
0 Kudos
Message 5 of 53
(10,608 Views)

On <malloc.h> not found with CV2015 I found this thread and it seems this is not a standard ANSI C header and so this should be a problem of open62541 library.

I'm going to investigate with open62541 developers.

Vix
-------------------------------------------
In claris non fit interpretatio

-------------------------------------------
Using LV from 7
Using LW/CVI from 6.0
0 Kudos
Message 6 of 53
(10,588 Views)

Vix,

 

If there's anything we can do to help on the CVI side of things after following up with open62541, please let us know.

Jason H
Automated Test Software R&D
0 Kudos
Message 7 of 53
(10,521 Views)

I proposed a fix to open62541 library so that it can be recompiled with CVI/CLANG (waiting for acceptance of the fix).

From your side, it would be useful if you could use the library to supply a classic client/server example working in CVI 2015 Smiley Wink

Vix
-------------------------------------------
In claris non fit interpretatio

-------------------------------------------
Using LV from 7
Using LW/CVI from 6.0
0 Kudos
Message 8 of 53
(10,496 Views)

Hi Jason,

did you have time to create an example in CVI 2015 which uses open62541 library to develop a working client/server pair (with a minimal UI)?

Vix
-------------------------------------------
In claris non fit interpretatio

-------------------------------------------
Using LV from 7
Using LW/CVI from 6.0
0 Kudos
Message 9 of 53
(10,297 Views)

Hi Jason,

after deeper tests on open62541 library I found two unexpected behaviors:

Could you help with them, please?

Vix
-------------------------------------------
In claris non fit interpretatio

-------------------------------------------
Using LV from 7
Using LW/CVI from 6.0
0 Kudos
Message 10 of 53
(10,286 Views)