Internet PLC Forum
General => Technical support => Topic started by: ahmed375 on May 08, 2003, 03:11:22 AM
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:) Hi all
i have a trilogi PLC and i wanna to establish a connection between a modbus dde server (I setup I/O server coming with Wonderware ) and My TriLogi PLC ,
when I try to read/write the memory addresses from MS Excel recieve an error in modbus server tell me that the status of read requested value is failed!!!
plz help me
Pat from Isreal
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Did you setup your DDE server so that it communicates with the PLC using 38,400, 8 data bit, 1 stop bit and no parity? The PLC default ID = 01. All these parameters must be configured properly so that the DDE server can talk to the PLC.
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It looks like my driver doesn't support 30.400 buad rate also i wanna you that we are trying with H28 and not a super PLC . Also the MODBUS driver has some selections for differnet Modicon PLCs and i don't know which one to choose, I will email you separately the help file of the driver so that you can have a better understanding of the driver we are using
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The T28H-Relay does not support MODBUS so you can't use it with the Wonderware driver. There is not much we can do about it except to ask you to switch to a T100MD+ PLC.
For M-series PLC such as T100MD+ or T100MX+ you can change the PLC baud rate to other values such as 300,600, 1200,2400,4800,9600,19200, 38400. You can even change the communication format to 7 or 8 data bits, 1 or 2 stop bits and odd, even or no parity. It is very flexible. The PLC can also be used as MODBUS master as it can send out MODBUS ASCII or RTU message to other MODBUS slave.