Modubus TCP/IP (industrial Protocol)

[gnicholl]

We are in the process of writing a dedicated labview connection driver to interface to a Acromag 966en 6006 temperature logger that utilizes the ethernet modubus standard. we are trying to advoid using third party opc servers as a intermediate stepping stone to this application as they are expensive and we need to limit costs. We have received some guidance from the Info LABVIEW group with some partial libaries. However these libraries they connect to the device, but the data returned dosent make sense. we are getting 65535 for all values in the registers instead of a temperature reading say like 229 which is 22.9.

Has any one had exposure to Ethernet Modubus ( PLC programming) with labview and shed some light on the matter. If you have written a connection driver suitable for use with LABVIEW 7.0 i'd like to here from you!

[malef]

just :2cents:

try this: http://www.air.nl/nlibrary/modbus_vi.html

Manfred

P.S. Sorry it's just for serial devices

[regisphilbin]

We are in the process of writing a dedicated labview connection driver to interface to a Acromag 966en 6006 temperature logger that utilizes the ethernet  modubus standard. we are trying to advoid using third party opc servers  as a intermediate stepping stone to this application as they are expensive and we need to limit costs. We have received some guidance from the Info LABVIEW group with some partial libaries. However these libraries they  connect to the device, but the data  returned  dosent make sense.  we are getting 65535 for all values in the registers instead of a temperature reading say like 229 which is 22.9.

Has any one had exposure to Ethernet  Modubus ( PLC programming) with labview and shed some light on the matter. If you have written a connection driver suitable for use with LABVIEW 7.0 i'd like to here from you!

3891[/snapback]

are you applying ieee754 math conversions?

Here's a link with web-based calculators for this math.....

http://babbage.cs.qc.edu/courses/cs341/IEE...references.html

also, check to see if you're using I32 indicators instead of I16....

Regis

[Olivier Jourdan]

Hi,

There is a ModBus TCP Driver for LV 7.0 here, it is not free, but there is an exe demo to try to comunicate

Hope this can help you

[celluloseester]

CAn this method use with Php