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modbus init issue

4/9/2013 12:31 PM	Rate (0)
sachin10 Posts: 4 Rating: (0)	hello guys, I am totally new at PLCs. i have read through books and i m using s7-200 right now. i have used modbus init function and slave function and i have filled up the details that the function asked. now i have test progrmme called MODBUS MAT to check the status. Basically i just want the response like valid response received. but everytime when i start polling it says time out. is there any parameter i need to change to get the valid response. i used mode, slave address 1.baud rate 9600. only for test purpose i used plc as a slave. Please reply it. I am struggling for this issue from 3 days. Thanks
sachin10 Posts: 4 Rating: (0)
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4/9/2013 1:13 PM	Rate (0)
adrian1982 Posts: 37 Rating: (3)	have you tried siemens example? https://support.automation.siemens.com/WW/llisapi.dll?func=cslib.csinfo&objId=27832512&load=treecontent&lang=en&siteid=cseus&aktprim=0&objaction=csview&extranet=standard&viewreg=WW
adrian1982 Posts: 37 Rating: (3)	Last edited by: adrian1982 at: 4/9/2013 1:14 PM
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4/9/2013 1:59 PM	Rate (0)
sachin10 Posts: 4 Rating: (0)	hello Adrian, yes, i have looked at this example but this example shows with two PLC whereas in my case i have only one PLC which is connected to pc through port 1 and modbus mat program to port 0. i have choosen plc as a slave but how can i choose master as i have only test prog. i have just MBUS_INIT function and MBUS_SLAVE in programe. i downloaded to PLC and with modbus MAT i just need confirmation that data has been received rather than time out error.
sachin10 Posts: 4 Rating: (0)
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4/9/2013 3:33 PM	Rate (0)
O_Moderator Diamond Member Joined: 4/24/2009 Last visit: 8/20/2024 Posts: 2682 Rating: (135)	Thread closed, because question is already discussed in the following thread modbus INIT Best regards O_Moderator
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