Connecting to MODBUS PLC

MODBUS Plugin Configuration and test


MODBUS is an application layer messaging protocol, positioned at level 7 of the OSI model, that provides client/server communication between devices connected on different types of buses or networks.
It is currently implemented using:
TCP/IP over Ethernet at a reserved system port 502 on the TCP/IP stack
Asynchronous serial transmission
MODBUS is a request/reply protocol and offers services specified by function codes. MODBUS function codes are elements of MODBUS request/reply PDUs.

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Communication with PLC

I would like to communicate with a PLC,
there is some type of help, or does anyone have the steps to do this?

Problems with programs

I am wanting to develop an application with the Free Scada,
I'm creating simple programs, but I can not call buttons with actions…
I am also wanting to create a tutorial for setting up the Free SCADA
I need help from someone…