MVP 2021 Flex727 Posted February 17, 2012 MVP 2021 Report Share Posted February 17, 2012 I love Unitronics PLCs, but I am constantly having a problem getting my laptop to connect to a v570 via ethernet. It always fails to connect the first time and I usually putz around with it for a few days and finally get it to work, after much lost time. Here is my situation: Using WinXP on the laptop and VisiLogic 8.6.3 (I know this isn't the latest version, but I am often working with installed systems and I want to maintain continuity). I can connect every time with a serial cable. I can ping the PLC every time. I assign a PLC name & port number and confirm them in the communications settings. As far as I know, these are the things I need to be able to communicate via ethernet: PLC IP address PLC name PLC port number Compatible, non-conflicting IP address assigned to the laptop Crossover cable when connecting directly, or straight cable when connecting through a hub TCP/IP card & socket initialization and PLC name in ladder using SB2 My problem is I have a PLC in the field that I will need to connect to via ethernet. Sometimes I do some updating and troubleshooting with a new PLC here in my office. I open the box, install the ethernet card, confirm functionality of the card, and download the program with a serial cable. At this point the PLC has the assigned IP address, card & socket initialization, and PLC name, exactly like the one in the field. I remove the serial cable, change the communication setup back to TCP/IP Call, confirm that VisiLogic has the correct IP address, PLC name, and socket number that matches the PLC, and try to connect. No go - I get the Communication Driver Error box (Communication over TCP/IP could not be established due to one of the following: etc, etc) Now I know there is nothing wrong with the ladder logic, as I have connected to a PLC with this same installed program many times before. I check the laptop IP address and the first 3 octets are the same as the PLC (I'm using 10.1.1). I can ping the PLC without error. I have the laptop wireless turned off and there are no other computers on this mini network. This kind of thing drives me crazy - it shouldn't be this difficult. What am I missing? Quote Link to comment Share on other sites More sharing options...
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