LabView DSC with ModbusTCP error

[AndyPF]

Hi. I'm performing some tests on the ModBus/TCP using the DSC module.

I have the Error -1967353901 when I run a simple vi trying to read a register from a slave.

First, the connection is working fine, I can read all the registers from the slave using two different test programs.

But, when I try to do that by my vi, I have the above error (cannot communicate with the slave).

I created the shared variable and deployed it with no error, but the main vi does not works when it try to access the register.

Also using the NI Distributed System Manager the PC cannot read the register (No Known Value after a while of Connecting...)

What can be the problem?

[alamanna]

Hi,
searching for your error code I found the following document

Error -1967353901 (Hex 0x8ABC8FD3) Occurred at Shared Variable When I Try to Connect To I/O Server Modbus Master
https://knowledge.ni.com/KnowledgeArticleDetails?id=kA00Z000000kG5xSAE&l=it-IT

and also a forum thread:

"Unknown Bad Quality" or "No Known Value" with Modbus I/O servers
https://forums.ni.com/t5/LabVIEW/quot-Unknown-Bad-Quality-quot-or-quot-No-Known-Value-quot-with/td-p...

Hope it helps!
Regards,
Alessia