Hello everyone,
I’m trying to get a communication with an Modbus server device over an X20 CP483.
I can read values out, and it’s also possible to write in register.
Now i configured for each bit from the register a separate integer. (Picture above)
Would it also possible to read direct an array of integer. Is there an easier possibility
to read from multiple register?In Help I couldn’t find any example.
This can’t be configured with the configurable “no code” client, ModbusTcp_any.
You can use arrays with the AsMbTcp library.
Hi,
okay thank you of that information.
Could you also give me an example how to implement in my code?
I’ve seen the needed information, but I couldn’t understand really.
Hi,
now below you find my code. Is this correct?
When I try this application nothing would be working.
What could be wrong?
Hi Franz,
I notice two things:
Unless you are doing it outside the Action, you are not calling the mbWriteRegister function block. You need to add “mbWriteRegister()” before END_ACTION.
The “mbWriteRegister.dataSize” parameter needs to be the length of the entire memory area you are writing, in bytes (see below screenshot from B&R Online Help ). The easiest way to do this would be to set your “i_DataSize” variable equal to the size of the i_Write_Data array:
mbWriteRegister.dataSize := SIZEOF(i_Write_Data);
Please try making these changes to your code and see if it works.
For your information, there is a Library Sample for the AsMbTcp library (called “LibAsMbTCP1_ST”) which demonstrates reading a coil and writing a register via Modbus TCP. You can add it to your Logical View as follows:
Select the top level project folder in the Logical View and double-click “Library Samples” in the Toolbox.
Within the Library folder that comes up, navigate to AsMbTCP, select “libAsMbTCP1_ST.zip” and select “Finish”.
You will now see the LibAsMbTCP1_ST package added to your Logical View.
okay thank you for this information.
I will try it.
