I communicate the Unitronics PLC vision 230 through Ethernet modbus , I was read and write the PLC registers and coils earlier but currently I face the problem as an Error 56 occurred at TCP Read in MB Ethernet Receive.vi I turn off the windows firewall setting also disable the antivirus. I Check the tcp IP communication between two PC using Active and Passive TCP/IP communication vi it work properly , I also check the MB Ethernet Example master. VI on one computer and MB Ethernet Example salve. vi on other computer but this not work and also try on same computer of these two VI but communicate this two vi. Please help its urgent.
