Cannot write negative values on server modbus on cRIO 9068

Hello everyone,

I'm moving a project from a platform of 9114 cRIO a cRIO9068, the reason for a difference of heavy in terms of power CPU, memory, performance FPGA etc...

Real time I deploy a modbus TCP server, and I publish just I16 data.

The problem comes when the program tries to write a negative value to a binded on modbus variable. This variable is in the same format (I16), the program could write negative values, between 0 and -32768, but whenever the modbus force set to zero.

I tested the modbus also with the 'system of distributed OR 2014 Manager' but always impossible to write negative values on I16, but I can if I consider the data as I32!

(see files)

Furthermore, I deployed a modbus server on my PC and in this case, everything is fine.

More information:

I work with labView 14.0f1.

The cRIO are installed 'Labview RealTIme 14.0.0' and 'server Modbus I/O 14.0.0.

I tested the feature on three different cRIO 9068 with the same result.

I think it's something wrong with cRIO 9068, can anyone help me?

Thank you

MZ

Hi, Marcello,.

I was able to reproduce the problem cRIO 9068 and it look like a CAR (corrective action request). I've opened a request for Corrective Action (AUTO ID 511039) to report the issue OR R & D.

Have you tried to implement MODBUS slave on ana MODBUS master PC on cRIO? I tried and it works even with I16 data types.

I hope this will help you.

Kind regards.

Claudio Cupini

OR ITALY

Technical support

Tags: NI Software

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