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Split from Using S7-300 Modbus RTU example in TIA v14.

Hello Sivuu,

can you be more specific at which point you're having difficulties? Have you looked at this application example:
https://support.industry.siemens.com/cs/ww/de/view/109474714

This should help.

Thanks for your reply.

I am new to Siemens modbus and I don't no which block need to use in the TIA PORTAL V14.

I checked the sample program but in that so many block are using .and also different CPU.

Mu hardware is 

CPU:S7-314C

IM-151-3

MODBUS MODULE:6ES7 138-4DF11-0AB0

SLAVE ARE 

S7-200 AND ENERGY METER.

 I need to read and and write the data from IM .

so how to start and which block need to use plz explain me.

I try with only mod_com_block and mod_master  .when I downloaded ,plc when to fault mode .

If u have any program please send to me.

This is my mail:I'd : ---deleted E-Mail---