AC800M_MODBUS RTU_MB READ_Start Adress issue
Hi I am trying to communicate to PM856 via COM3 to the Modbus Buss Slave software.
I want to read 30001 to 30009 integers address from thorough this. My laptop which having Modbus slave software is connected to PM856 at com3 by using USB to serial converter.
At control builder I am using MBconnect and MBread. And I am giving STARTADDRES of MB read is %IW10#0001.But still there is not communication. Please advice. Advance thanks
If you are using function code 4 (reading input register) then the address will be 30001-39999 then the address in the AC800M side should be %IW10#000=30001. and not %IW10#0001=30002
along with this please look into the modbus parameter of both the sides, You can chekc the error code easily using CBM online help by pressing F1