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Failed to send command
July 11, 2016
14:52, EEST
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Ibrahim
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Hi,
i’m trying to connect the ModbusServer to a Modbus/TCP SensorDevice. I’m getting the following error:

07/11/2016 13:50:43.965 WARN [a RUNNING] com.prosysopc.ua.app.mb2ua.modbus.a – Failed to send command ‘/192.168.101.23:502’ dataItem: DataItem ioType=IR register=0 count=2 dataType=REAL error: java.lang.ClassCastException: com.ghgande.j2mod.modbus.msg.ExceptionResponse cannot be cast to com.ghgande.j2mod.modbus.msg.ReadInputRegistersResponse

what does this mean??

Thanks

July 11, 2016
22:55, EEST
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jestun
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Hi Ibrahim,

are you trying to read one or two REAL tags? The count is per tag and not the amount of registers read, so your configuration is trying to read four registers into two REAL tags. The error message indicates that the server is trying to read from a register that doesn’t exist.

/Jesper

July 12, 2016
9:53, EEST
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Ibrahim
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Hi,
thanks for the answer. OK, maybe there is an error on the modbus device side. I will check that.

Ibrahim

October 21, 2016
23:14, EEST
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hbbend
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Hi everyone,
I tryed Prosys Modbus UA Server with two PLCs, and I read digital inputs and outputs but i can’t write values to them.
Would you like to help me with this issue
Thanks in advance,

October 24, 2016
16:29, EEST
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Jouni Aro
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Please, check the app.log in the settings directory (normally at c:\ProgramData\ProsysOPC\ModbusServer). It should provide some errors that are related to the failing writes. Can you write to the respective output signals with some other Modbus master?

October 24, 2016
23:17, EEST
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hbbend
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Thank you Mr. Jouni,
Writing to outputs even using another OPC server was unsuccessful. However, I have found a way to do so, by writing to the address of the internal bits and allocate them to hardware outputs in my PLC programm.

October 25, 2016
10:51, EEST
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Jouni Aro
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OK, very good. Thanks for confirming that you got it working.

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