Hi Second try to send this mail to the list...
For the machine I'm building, I've to use two glue tanks. When one is empty, the second one is automatically switched on, then at the next end of the program, the user has to refill the empty tank before he can restart another cycle. Then if on the next cycle the second tank become empty, the machine switchs back to the first one, and so on. If for some reasons the two tanks are empty at the same time, program is paused and user have to refill both before it can resume the program. To manage this system, I planned to use some grafcet programming, as this was widely used in France during my studies, it is quite natural for me to use it. I know ladder is prefered by most people, but ladder is something like chinese for me... Specially this : / "ALL the inputs are read, ALL the logic is figured out, then ALL the outputs are set. This can presents a problem in certain circumstance if the output of one line feeds the input of another." http://www.linuxcnc.org/docs/html/ladder_classic_ladder.html/ This is exactly a problem for me because to chose what tank to turn on depends on wich one was in use before the "tank_n_empty" event happens. I also see this in the doc : / "Sequential programs do not work alone-there is always a ladder program as well that controls the variables."/ Well, I figure I can live with that. But... Sequential editor simply don't work, selecting anything other than "modify" frozes the whole thing. And when using "modify" you can do some editing, but not all can be done. Specially you can't use TRANSITION LINK-DOWNSIDE/UPSIDE, and I need some... I use 2.4.0pre from mozmck experimental packages. May be this is a issues with this particular version ? Is this fixed in next release ? Or do I need to switch back to an older one ? Or if you have some link that can explain me how to convert my grafcet program to a ladder one, that would be great. In the end, I can turn my grafcet to a physical Dlatch schema that will be implemented with HAL. But I suspect this is not the funny way to do... Thanks Yann ------------------------------------------------------------------------------ This SF.net email is sponsored by Sprint What will you do first with EVO, the first 4G phone? Visit sprint.com/first -- http://p.sf.net/sfu/sprint-com-first _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
