Modbus TCP Codesys Comunication

[skrdem507]

Hi guys this is my first post i have been searching for information about how to link a AC500 via modbus tcp with a network analyzer M2M ABB

 

[Highland Controls]

I have used Modbus/TCP with the AC500 family for several project, and it is extremely confusing. The addressing is very difficult to figure out. There are a number of steps to do, both in the configuration area and in CoDeSys. Do you have any documentation or app notes?

 

[(8{)} ( .)]

Here you go. Sample read. The 1st part is the program definition + variables. The 2nd part is the code.


PROGRAM PLC_PRG
VAR
MBTCPMast :ETH_MOD_MAST; (* ModbusTCP master function block *)
pollTON :TON; (* Timer for message polling *)
MBinData : ARRAY[1..10] OF WORD; (* Data read from remote device *)
END_VAR

VAR_GLOBAL CONSTANT
MBfcode_ReadRegs : BYTE := 3;
MBfcode_WriteRegs : BYTE := 16;
END_VAR


(*-----------------------------------------------------------------*)

pollTON(IN:= NOT pollTON.Q, PT:= t#100ms, Q=> , ET=> );

MBTCPMast(
EN:= pollTON.Q,
SLOT:= 0,
IP_ADR:= IP_ADR_STRING_TO_DWORD('192.168.1.2'),
UNIT_ID:= 0,
FCT:= MBfcode_ReadRegs, (* Modbus function code *)
ADDR:= 0, (* Modbus address = 400001*)
NB:= (SIZEOF(MBinData)/2), (* Communications block size (in words, not bytes) *)
DATA:= ADR(MBinData), (* Pointer to ComBlock *)
DONE=> ,
ERR=> ,
ERNO=> );

 

[skrdem507]

The documentation i got is the general information of the SLAVE (M2M), and the one you get in the help instruction in the codesys, im gonna try your code ill reply to u later on how i did. if u guys got some examples or printscreens from ur projects i will be more than gratefull.

 

[(8{)} ( .)]

Feel free to contact me. It's going to be a hairy week but I check the site daily.

Good luck!

Yosi