![]() ![]() Try writing a small program in IEC and then read it back in GX and you'll see what I mean. The PLC itself does not understand, for example, what structured text is! GXIEC contains a "compiler" which translates all your nice symbolic graphical work (which you understand) into raw instruction list (which the PLC understands). At the end of the day, all that is written to the PLC is melsec instruction list. What is written to the PLC is not what you see on the screen. So say for example your program consists of 5 pou's each written in one of the editors, Lad, FBD, ST etc. In GXIEC you can create your programs in any or all of the 5 IEC language editors. In GX, what you write in ladder or list gets sent to the plc - straight forward. There are significant differences between GX IEC Developer and GX Developer, but I'll try to explain the most significant difference which is the way that it handles the code that you write.
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