Step7 and Modbus problem

[plc'r'us]

I have to program a communication between a Siemens S7-300 with CP341 and a Slave Modbus from other manufacturer (Sofrel). Anybody know the way to do that?. Anybody have an example or the driver for Hardware Configuration of CP341 Master?
Thank you

 

[Bratt]

Do you want to set up an ethernet connection between the modus gateway and the CP341?

 

[tj@ewingcontrols]

CP-341 MB Master

I have code for MB Master driver (fcn 2, 3, 16) that I modified from Siemens tech support guru M. (mike/mark/mack?) McCay's demo code. It has a polling routine along with MB Host Read/Write function blocks. Since I don't write via MB I can't say how that part works, but the read function is good.

Did you know that Siemens sells Modbus personality modules that plug into the CP's?

 

[dchartier]

Hello;
The following link will take you to the Siemens support webpage that allows you to download a modbus driver (master or slave) for the serial CPs of the S7-300/400; you will also find programming manuals for the implementation of Modbus function calls; you can basically copy the functions< blocks in your program and modify them to suit your needs.
For this to work, you will need to buy a Modbus driver licence from Sieemns (it actually consists of a hardware dongle you install in thje CP341, so it can't be copied); you will also need to install the P-to-P CP parameters software (downloadable fron<m the same site, also comes with the Modbus dongle).
Hope this helps,
Daniel Chartier

 

[RRobbins]

TJ, You must be talking about Murry MacKay. I think he wrote the Modbus driver for the S7-200 PLC.

 

[gilberto_viconsult]

Dear Daniel,
you can please indicate the link to the siemens support webpage you refer below?

Thank you very much
Gilberto Vitor

Hello;
The following link will take you to the Siemens support webpage that allows you to download a modbus driver (master or slave) for the serial CPs of the S7-300/400; you will also find programming manuals for the implementation of Modbus function calls; you can basically copy the functions< blocks in your program and modify them to suit your needs.
For this to work, you will need to buy a Modbus driver licence from Sieemns (it actually consists of a hardware dongle you install in thje CP341, so it can't be copied); you will also need to install the P-to-P CP parameters software (downloadable fron<m the same site, also comes with the Modbus dongle).
Hope this helps,
Daniel Chartier

 

[gilberto_viconsult]

Yes, I´d found it.

http://www4.ad.siemens.de/WW/llisap...view=4000003&viewLevel=6&wttree=cs&jumpto=260

Thanks.

Dear Daniel,
you can please indicate the link to the siemens support webpage you refer below?

Thank you very much
Gilberto Vitor

 

[plc\'r\'us]

modbus driver

You must go to this page

http://www4.ad.siemens.de/

and open the tree in this way: Automation Systems>Simatic>PLC>S7-300>communications>Loadable Drivers for CP441 and CP341...

you can download it from here.

If you have the Software "CP PtP Param", obtained if you bought some S7-300 communication processor, you´ll can use this Modbus drivers and write your program with the blocks P_RCV_RK (FB7) and P_snd_rk (FB8).

Sorry for my english

Good Luck