S7-200 modbus programming

Hi
Anyone please give me a sample program for modbus communication in step 7 microwin.
I would like to study the basic instructions for this.
Please help me
Chitra

modbus RTU ? Slave or Master

if you want to make availaible your program to a scada system, you must be slave and it is very easy to do with Siemens modbus library.(You may have to order it)
This consist of an initialisation block called once at start up (Mbus_Init) this block set communication details like speed adress id and data size and adress.
Then you add ''Mbus Slave'' block called every scan and you're done

https://www.automation.siemens.com/...ow.aspx?HTTPS=REDIR&PostID=342029&language=en

https://www.automation.siemens.com/...ow.aspx?HTTPS=REDIR&PostID=333971&language=en

Thank you Mr. Jeff