Arduino Mega to a Unistream HMI/PLC via MODBUS

[Andrew_Spencer_Brennan 0]

Good day All 

Im wondering if someone will be able to assist me with the following.

we have a few in house built machinery that runs off Arduino Controllers. We needing to link it up to a Unistream HMI to Display the Data. I know it can be done via Modbus. 

Im just needing some help with the initial Modbus from Arduino to Unistream setup

 

Please Assist where you can 

[Joe Tauser 346]

What have you done so far in ArduinoLand on the Modbus stuff?  Which model? Will the Arduino be a slave or a master?

Joe T.

[Andrew_Spencer_Brennan 0]

Hi Joe 

I have done a lot with Arduinos but never before had to do Modbus with them. Ive done Modbus between PLCS and other controllers just not Arduinos.

Im going to use and Arduino Mega. it will be a slave device from the Unistream.

[ORSO2001 8]

Hi Andrew,

exist many arduino library to use modbus RTU or TCP protocol..both master and slave...then how do the sketch depends on which library you will choose.

each library include examples and someone also a manual...pay attention that Arduino MEGA doesn't has a native RS485 or ethernet port then you will need some extra board (usually cheap).

[Andrew_Spencer_Brennan 0]

Thanks, once the parts arrived i will let you guys know if i come right

[Franco Yañez 0]

Dear,

Do you have news about this development?

I also have the need to be able to communicate arduino with PLC Unistream. Tried some modbus TCP / IP libraries, but had no success.

Thanks in advance for your answers.

 

 

[Joe Tauser 346]

Setting up the first communication between two devices can sometimes be tricky.

Upload your UniStream program so we can see how your Modbus is configured in it.

Joe T.