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I'm currently using a Delta PLC, programmed with the Delta WPL software, and I'd like to use LabView to create a very simple GUI which would allow the user to communicate with the PLC (basically, the PLC would be running but doing nothing til the user writes data in one of the coils). I don't know how to do that, and I don't even know if it's possible ?
The PLC I'm using supports Modbus. I tried to use the Modbus library from LabView but I'm not sure it's useful for what I'm trying to do.
The Modbus library can certainly be used to read and write registers and coils. You just need to know the relevant details for your PLC (address, coil addresses, ASCII/RTU, etc.) and to make sure the PLC is configured to accept these commands.
The Modbus library should have a couple of examples showing how to act as a Modbus master, which is what you want.