Modbus TCP/IP Communication

vinayakid · Jan 5, 2010

Hi,
Happy New Year !

I am trying to establish the communication between Telemecanique PLC and AB ControlLogix PLC.
The Tele PLCs are on the Modbus TCP/IP network. I want data to and from these PLCs to the ControlLogix PLC.
The ControLogix is on a seperate EtherNet network. I can add a third party communication module to CLX chassis if requried. and also do the necessory cabling for that.
Can anybody suggest me a method to do this ?
Also note please let me know if the Modbus TCP/IP N/W can handle the string data transfer between Tele PLC and CLX PLC.

Thank You,

Vinayak
[email protected]

smiller · Jan 5, 2010

Prosoft technologies has the modules that will do what you want. They have a new one out, I don't remember the number, that does that translation for you without any configuration on your part. At least that's what Prosoft advertises.

Steve

jonnies · Jan 5, 2010

Modbus does not have native support for strings. I have never worked with these specific PLCs, but unless you can access the string's memory directly, you will have to convert them to their ascii numerals, store them in integer registers, and send them as integers. Then on the other side you can move them back from ascii to characters.

Joe_WaZoo · Jan 5, 2010

I have done this using a Red Lion DataStation Plus product as the middle man between a Modicon PLC talking ModbusTCP and the ControlLogix PLC with the L5K file driver imported in to Red Lion Crimson software. It was so easy a Caveman could do it. I also share the love of the DSP to talk to a Yokogawa PLC at the same time as well to the AB PLC. Again, super easy and simple to do. Here are some photos:

DSP In Action

Joe_WaZoo

Ken Roach · Jan 5, 2010

As jonnies points out, it may be that Vinayak did not literally mean a "string" but rather an array of integer data values. No matter what method is used, the data types should be better understood.

For Modbus or Modbus/TCP communications to a ControlLogix platform, I have always relied on ProSoft Technology.

The current slot-mounted product for ControlLogix is the "enhanced" module MVI56E-MNET.

I do not recommend devices that advertise EtherNet/IP functionality but have not undergone ODVA conformance testing.

A_Rivas · Feb 4, 2010

Joe_WaZoo said:
I have done this using a Red Lion DataStation Plus product as the middle man between a Modicon PLC talking ModbusTCP and the ControlLogix PLC with the L5K file driver imported in to Red Lion Crimson software. It was so easy a Caveman could do it. I also share the love of the DSP to talk to a Yokogawa PLC at the same time as well to the AB PLC. Again, super easy and simple to do. Here are some photos:

DSP In Action

Joe_WaZoo

I have a similar application as Joe_Wazoo but i'm having problems importing the tags from the .L5k or the .CSV file.

When I try with the CSV file it tells "The following lines in the file contained erros: 1,2,3... The lines without errors where imported"

and when i try with the .L5K "You have made changes to the Logix Tag Names that may invalidate data tag references in the database. You should correct this by running validate all tags utility from the data tags window"

anyway, i can't import the tags.

thanks

CowDung · Feb 4, 2010

That message you see after the .L5K import is fine--you just need to go to the 'Data Tags' tree and press the 'Validate All Tags' button.

A_Rivas · Feb 4, 2010

CowDung said:
That message you see after the .L5K import is fine--you just need to go to the 'Data Tags' tree and press the 'Validate All Tags' button.

I already tried that, but since I have no tags to validate, nothing happens.

I try to do it backwards, generate an .csv export file from the crimson, and try to import to the RSLogix, and it shows me a mismatch import export version.

CowDung · Feb 4, 2010

The L5k import should populate your Communications Protocol - Native AB L5k tags. I think you still have to create the tags in you Data Tag area to use them on your application screens.

Joe_WaZoo · Feb 4, 2010

Rivas,

Send me your .L5K file and your .csv tag listing and let me try it out. Send it to [email protected]. What model of Red Lion product are you using as well?

Thanks,
Joe_WaZoo

Modbus TCP/IP Communication

vinayakid

Member

smiller

Member

jonnies

Member

Joe_WaZoo

Lifetime Supporting Member

Ken Roach

Lifetime Supporting Member + Moderator

A_Rivas

Member

CowDung

Member

A_Rivas

Member

CowDung

Member

Joe_WaZoo

Lifetime Supporting Member

Similar Topics