Hello Everybody I am trying to use Proview with some Modbus RTU devices, using Modbus_RTU_Master, Modbus_RTU_Slave and Modbus_RTU_Module.
I put all these object in NodeHier but I am new on that, can somebody help me?

For example where I put the slave address? I did not found it.
How to connect with the PlcProgram?

I try to follow Modbus TCP in the manual, but no success.

Thanks
Best Regards

Did you found this tutorial?
maba.dk/tutorial_modbus_rtu.pdf

Hello MArc, yes I found but this one is not using Modbus_RTU_Master, Modbus_RTU_Slave and Modbus_RTU_Module. new Proview object, I guess with these object the task will be much easer when you have 100 slaves for example.

Other problem is that I did not find how to edit a subwindows, may be it is a bug, because I can't edit reaching the menu bar and put in edit it do not work, I have to learn more.

Thanks
BR

Hi,

In Master you set com port parameters. With Slave you group modules. With Module you specify Modbus ID and function code, so if you want to R/W to a slave you need at least 2 modules per slave. The address in Module is used as address offset in the standard Modbus table. Use Uint16 for channel representation.

I am attaching a acreenshot of a working example controlled by the PLC. If you want manual control of R/W, disable Continous and use SendOp flag.

C.

Hello Cristian thanks for you reply your screenshot was very helpfull, but I still don't find where I put my modbus slave address, I have several devices with address 1, 2, 3, 4 and 5 for example.
How can I indentify witch one I am reading or right? What is the process attritube? is it the modbus ID slave? if not where to put modbus ID?

Thanks
Best Regards

The modbus id goes in UnitId in module.

If you let the PLC control de R/W (Process=1 and specify PLC thread), then in each scan cycle the PLC will use the module properties to send a commands to all modules it controls. In the example case, the PLC will send one command to slave id = 1, command code = 03 (read holding registers), address = 0x0000 (default 40001). For Continous=1 R/W is automatic.

If you need manual control of read/write cyle, which is somewhat disarable for slow connections, you need to set Continous=0, and use the SendOp flag from PLC or application.

C.