It's after midnight and I had a very late night last night so I may have missed a few things but bear with me.įor a stand-alone system the compiler could be written in Spin itself and the ladder logic diagram could be stored as a text file either in EEPROM or SD card on the target. Where the symbol starts on a line is the index into the line array where labels and data are stored. The label for this was parsed on the preceding line and it remembers the value of the label from the position on the line. When the parser sees certain character sequences such as -|/|- it interprets this as a normally closed signal. By using very simple rules it should be possible to extract the symbols and generate interpreted byte codes to represent the operation. Imagine the diagram is coded in ASCII characters to represent the various functions and that this closely matches a normal ladder diagram. Here's an idea for a dirt simple Ladder Logic compiler. Ron Nollet mentioned it would be good to be able program in Ladder Logic, the language of PLCs.
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