Modbus PC(master) - ABB PLC slave

[naturephoenix]

I have downloaded Modbus Poll software ,so I can siulate SERVER and client.

In my example Server is PC with IP - 192.168.0.17
SLAVe is PLC 192.168.0.99

I manage to connect to MASTER NETWORK with Modbus Poll software
with following settings
Connection : MODBUS TCP/IP
Remote Modbus server, IP : 192.168.0.99 port 1201

Setup settings inside Modbus Poll software ( read/writte)
Slave_ID :1
Function: Read holding registers
Adress : 0
Quantity : 1
Scan rate: 1000ms

But read/writte is not working

Inside PLC I am using ETH_MOD_MAST function.
http://tinypic.com/view.php?pic=33x8...9#.V1lziqKvySk

My Variables are inside PLC:
DATA_WRITE AT %MW0.0 : WORD; (this value i am trying to transfer)
rest of variables are inputs and outputs of the "ETH_MOD_MAST" function

Any help, I can give all settings inside PLC. But its nutin beside this function and the IP adress

 

[Highland Controls]

Sounds like you have 2 masters. One needs to be a slave. What PLC is it?

 

[naturephoenix]

Plc slave

 

[Steve Bailey]

SLAVe is PLC 192.168.0.99

Inside PLC I am using ETH_MOD_MAST function.

These two statements appear to be self-contradictory.

 

[naturephoenix]

OK i comment all parts inside PLC. I have connected from PC software to IP of PLC 192.168.0.99 port 1201

Now I am trying to read data from PLC, but nutin

I have downloaded Modbus Poll software ,so I can siulate SERVER and client.

In my example Server is PC with IP - 192.168.0.17
SLAVe is PLC 192.168.0.99

I manage to connect to MASTER NETWORK with Modbus Poll software
with following settings
Connection : MODBUS TCP/IP
Remote Modbus server, IP : 192.168.0.99 port 1201

Setup settings inside Modbus Poll software ( read/writte)
Slave_ID :1
Function: Read holding registers
Adress : 0
Quantity : 1
Scan rate: 1000ms

But read/writte is not working
http://tinypic.com/view.php?pic=33x813l&s=9#.V1lziqKvySk

My Variables are inside PLC:
DATA_WRITE AT %MW0.0 : WORD; (this value i am trying to transfer)
rest of variables are inputs and outputs of the "ETH_MOD_MAST" function

Any help, I can give all settings inside PLC. But its nutin beside this function and the IP adress

 

[Steve Bailey]

Your Modbus poll software is trying to read 1 word (2 bytes) of data from the beginning of Modbus holding register data area from a Modbus slave device at Modbus device #1. Presumably this would be address 400000 in the slave. If you get no response at all, it is most likely because there is no Modbus slave device with that device number. Check your setup of the slave device.