henrylow

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  1. PC & PLC communication

    henrylow replied to henrylow's topic in Mitsubishi

    Thanks to liuzu2000 & Calvin. The problem I have now is that the PLC can read the data I sent from PC, but the PC can't read the data from PLC. Previously I have no problem with this. That was when I was using Win NT visual basic version 4. Is it PC operating system causing the communication problem? Because I'm using Win XP now. If XP causing the problem, can the problem be solved by using visual basic version 6 or later?

  2. PC & PLC communication

    henrylow posted a topic in Mitsubishi

    I need to write a Visual Basic program to communicate with a Mitsubishi PLCs using an A1SJ71UC24-R2 serial card. What is the quick and easy way to read and write data registers from Visual Basic? Can some one help me?