In case I need an 'OR', I use the '+' sign. That would be a whole lot to write down in your documentation though, so that is why I do it that way. Look at the transition from Step 0 to Step 1, it says, 'INPUT_PUSHBUTTON * CYL1_INTERLOCK' which in my world means: 'the input from the pushbutton needs to be there, AND the interlock needs to be satisfied'. This probably requires some explanation, because over the years, I have developed this way of notation, which does not necessarily follow the strict rules of IEC1131 or whatever other standards there may be, but I'm assuming that if you read this, you understand the concept of steps and transitions.
This also means that your Grafcet documentation for a certain machine does not change with the manufacturer of the PLC you are using.
This means nobody has to buy the expensive SFC programming modules, it is easy to read and troubleshoot, and less skilled maintenance people that you often have to deal with are not completely lost in a pile of spaghetti. What is even better is that with a little bit of programming skills, it is possible to translate these Grafcets to ladder logic. I seriously believe that no machine cannot be programmed with this method, and if I would have the opportunity to make the decision every time (unfortunately the customer is often involved in this), I would never use anything else. After some getting used to that, I absolutely loved the way it enabled me to program and troubleshoot complex machinery, and ever since, I've tried to use this method whenever I could. There was absolutely no process in their PLC logic that was not documented by an SFC or as I like to call it, a Grafcet. I have worked for several machine builders, and one of them had given the term 'SFC logic' another meaning. In addition, drawing frames can be customized as needed and also Scaling or rotations continuously function.I often find that using SFC's or Grafcets is the easiest way to design industrial automation systems.
Thus, existing connections may be easily updated with new symbols, for example, facilitate alignment lines and associated functions support the precision. Professional, but above all comfortable and user friendly are the functions for drawing. Since the program as a process description GRAFCET in different dimensions used the visualization and editing, as well as controlling and monitoring the processes simplified. The results will also be output as a text file.
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