Possible to use Labview DSC to Modbus over Lantronix using ethernet encapsulation?

Hi,
I'm currently evaluating LabView DSC 2009. I want to connect to a Modbus PLC system, which is rs232, connected via a Lantronix box. I have the Lantronix software installed for com port redirection. I set up a serial Modbus I/O server, and every works great.
I was also playing around with the demo of LabView OPC Servers, and noticed that instead of selection com2, I was able to select ethernet encapsulation, and directly type in the IP address & port of the Lantronix box, and it worked great as well.
However, I noticed that when I close things out using the serial connection, it still leaves the port open & the computer connected to the serial port (verified using the Lantronix Manager). If I use the ethernet encapsulation route, it closes everything completely (since it doesn't use the installed Lantronix software redirector).
I have another user who will occasionally need to connect to the PLC using ProWorx, over the same Lantronix box, using a different computer. This often requires me to manually close out & disconnect the port, unless using the encapsulation method.
My question is: Using the DSC Module (over Modbus I/O server), can I use ethernet encapsulation instead of having to manually/force close the com port?
Thanks,
Jacob

Hi,
As you noticed, there are differences between Modbus RTU, Modbus RTU/IP (encapsulated) and Modbus TCP. The first involves the use of a Com port on your computer and on the PLC. The second involves the use of a Device Sever (TCP Server) without using a Com port on your computer and not on the PLC. The third involves Ethernet media only.
Using Modbus RTU encapsulated, your computer keeps com ports free. So, you don't have to open and close the com ports. This task is performed by the Device Server (between PLC and PC).
I have been using Share variables to read/write from/to an array of singles with success, and definetly it's better than doing it at single read/write.
You will find tha NI OPC Servers and KepServer are the same software.
Now you can read/write from/to an array
All this process is performed without using PC's Com Ports

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Hello Pentsi,
I have received confirmation (from the PSE in the US) that DSC doesn't support group writes
There however work-arounds that might provide a solution:
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Then use a 51st item as synchronization OPC item to check/indicate if new data has arrived/has been set/is available.
So LabVIEW sets 50 OPC values as fast as possible. The 51st value becomes goes from false to true when the first 50 values are written.
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Kind Regards,
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I am using LabVIEW DSC module as a OPC client. My Shared Variables are binded to automation system OPC Server via "OPC Client IO Server".
On the OPC Server side it seems that the every write commands comes like one item at time, not like grouped.
Now I have tested this with the NI OPC Server as server and KepServer and LabVIEW DSC IO Server as OPC Clients.
When I use the NI OPC Server : OPC Diagnostics there are different events messages when the update request comes from KepServer or LabVIEW DSC.
There are log files on attachements for both write events.
Attachments:
Data from the KepServer.txt ‏6 KB
Data from the LabVIEW DSC OPC Client.txt ‏18 KB

Hello Pentsi,
I have received confirmation (from the PSE in the US) that DSC doesn't support group writes
There however work-arounds that might provide a solution:
- The first solution I had in mind was like this. Update the 50 OPC items as fast as possible.
Then use a 51st item as synchronization OPC item to check/indicate if new data has arrived/has been set/is available.
So LabVIEW sets 50 OPC values as fast as possible. The 51st value becomes goes from false to true when the first 50 values are written.
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In the meanwhile at the LabVIEW side you wait until the 51st value goes back from true to false.
When it becomes false, then you write again those 50 values and afterwards set the 51st synchronization value from false to true.
And this keeps on going...
Note: Keep in mind that you only have to monitor one event at the side of the Automation System OPC Server in this case (the 51st) and based on an event occuring over there you can just do a group read of the 50 others. Also keep in mind that the maximum rate (6500 updates per second) from inside LabVIEW with the DSC Module OPC client I/O server was also mentioned in this document (http://digital.ni.com/public.nsf/allkb/63C043359F1E12538625726E005BCD0C?OpenDocument).
Could this be a possible solution for your problem?
If you're using one of the OPC servers in this list (http://zone.ni.com/devzone/cda/tut/p/id/6417#toc19), then you can also use NI OPC Servers to update tags instead, which supports a faster update rate.
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CLD, CTA
If someone helped you, let them know. Mark as solved and/or give a kudo.

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"Cyril" wrote in message
news:[email protected]..
> Michael,
>
> I am a little bit confused about the configuration here and the
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> DSC
> I would strongly encourage you contact the support at National
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Solved!
Go to Solution.

This thread is a bit old, but I thought it would be worth while responding (as I was wondering the same thing a day ago).
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Possible to use Labview DSC to Modbus over Lantronix using ethernet encapsulation?

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