Hi,

With reference to Modbus_Master of RS485 that I would like to know about it in order to ensure appropriate setting such as programming and setting in the Step 7Manager tool before begin commissioning test.

Please, look at the below what I do and then could you give me some advise tip on how to define properly without some of troubles if there are some problems. Also, see attached program files.

Start Bit : 1 / Data Bit : 8 / Stop Bit : 1

Speed : 9600pbs

Parity : even

DB42.DBB0 : 1  (Slave Address)

DB42.DBB1 : 4 or 16 (Function Code)

DB42.DBW2 : 0 

DB42.DBW4 : 20

DB42.DBW5 : DATA1(Whole Length : 20 WORD)

Thanks you very much for your cooperation.

JongMin, Hyeon(Jake)

JM Research and Development CO.,LTD.
Principal Research Engineer Dep`t
[CP] +82-010-3002-4369 [Tel] +82-052-233-5497
[E-mail] qkrxjwnrl@naver.com
[Add] 1004-14, Bangeo-dong, Dong-gu, Ulsan, Korea 682-792

Hi,

Thanks you for your cooperation.

With reference to mapping address of mudbus master, as I mentioned the function code was adopted with 16 and 4 between the CP341 and the Sepam 80. In this case, I wonder if the registers is correct about as below information what you gave me a advise.

I appreciate if you can inform me in order to ensure appropriately the register.

Note that;

FC4: 40001 ~ 49999

FC16 : 30001 ~ 39999

Would you mind if i can use about above the register of modbus.

New question published by www.dientuvietnam.net/forums/forum is split to a separate thread with the subject How to test Modbus Master Cp341 in S7-Cpu135 with Slave PG.

Best regards
Min_Moderator