Hi Navid,

I have S7-1200 1214C DC/DC/relay with upgraded firmware to 4.1.3 and I want to connect

to one Schneider PM1200 by mod bus module CB1241.

After trying many  configurations,right now tax/RX LEDs blinks at the same time,but I do not

have any data,I am trying addresses with/without 4 (3925).

Can you help me

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Split from Connection between 2 Schneider PM1200 Power Meter s and S7-1200 PLC through Modbus RTU.

Hello,

post your MB instructions Picture and structure of DB for data. You want read register value? Look pls also to status value what shows, also check Error status.

Dear Chris,

Thanks for your kind reply,

All of my picture and problem is integrated to a PDF file and attached,look at kindly

Thanks

Hi khatn.

I been writing library to simplify modbus. It's still in beta, but it should work for your use case. See the attachment how it can be solved. 

To download the library go to: https://github.com/olab84/sn7mb/  Download the source files and import "blocks.scl" and "udt.scl.udt" in to tia-portal. 

I will be happy if you try it out for me.

Hello khatn,

try put register address with 4 leading, like 43925. Make test. Also make your buffer enough for needed data type.

Dear Chris,

Thanks,I. Tried 4xxxx and 40xxxx format,but unfortunately no data

If you have any other idea,happy to hear.

Warm wishes

Dear ola,

I downloaded a zip file,and imported them in my tia,but they are scl files and

I don't know how to use them ,meanwhile two of them had errors during 

"Generating blocks from sources" that are "blocks&example".

Please guide me how to use them,

Thanks

Warm wishes

Hello,

pls look to your Picture carefuly again, your HW ID is 0, this is not correct, what is address of your CB card? Also setting up Timer to 100 ms is in my opinion very brave from you, you can set 1000 ms min. Look pls to Help of instructions and carefully read Input field description. There are also Output fields of instructions that can show needed statuses about errors, succes send/receive, ... I'm very sry, but I didn't test OLA's library so I'll be not helpful to you, for me is enough Siemens library now.

Hi ,

I checked the port and CB address in my pictures,

it was 270,that is exactly the same as software shows.

In fact I do not know,where should I set the function code 4

It might be the bottle neck do you know it? If yes please guide me

Thanks,

Warm wishes

Hello,

in this case of right settings, look to MB_Master instruction MODE parameter. Now you have value 0 what is ok for reading registers and Input Words (MB functions 03 and 04). Look to TIA help for MB_Master instruction and click on MODE parameter. There you can see MODE value options for your needs. As I said, maybe try connect with PC and try request data via some MB application. Are you sure about Slave address 1? Simply check all important settings for first.