Adreasler Posted September 6, 2018 Report Share Posted September 6, 2018 The situation is as follows. (It's a funny story from the outside.) I was trying to get a V700 HMI/PLC to communicate with another device through TCP commands, when I realized that both machines have RS-232 ports. "That will simplify things," I said, and I put in the function blocks to prep COM1 for the communications. I also removed the now superfluous rungs that set up the Ethernet. Little did I realize that COM1 was not Port 1, but the USB port, and I also failed to realize that the "Set PLC name" function block was in the ethernet rung I had deleted. Now I cannot reach the PLC through the ethernet at all, and I can only communicate with it by USB when the PLC is in the 'Pre-boot" stage (power the PLC up while pressing on the screen, then remove finger and press again to half the "countdown to O/S load.") In this Pre-boot mode, I can communicate with the PLC, but I cannot download a new ladder logic program to it, and if I let the O/S load, it locks out the USB port so I cannot communicate with it to download a new ladder logic program. Is there a way to remove the PLC's existing program so I can put a corrected program into the system? Quote Link to comment Share on other sites More sharing options...
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