D
Dave West
On Sat, 22 Jan 2000, Stan Brown wrote:
> On Sat Jan 22 06:21:08 2000 Dave West wrote...
> >
> >I don't see how this differs from any othe pure logic form (eg. ladder),
> >it's just a bunch of "if then else" statements or contact---contact---coil. Just a prettier way of displaying same.
> >
> >I will therefore assume a massive over simplification in your explanation
> >as you seem very strongly convinced that it will be better run by a special engine.
> >
> It helps to know how this is implemented. In an AB controller, each of
> those boxes is a program file, in addition to what he showed, there are
> transition steps. AS a result only a few of the total number of program
> files are being executed at any one time, instead of scanning all of
> them. You can achieve the same thing without SFC, but properly
> structuring your program.
OK, now I'm realy intrigued. Where can I get a book on this SFC stuff.
Dave West E-Mail: [email protected]
Semiras Projects Ltd. PGP public key available on request.
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> On Sat Jan 22 06:21:08 2000 Dave West wrote...
> >
> >I don't see how this differs from any othe pure logic form (eg. ladder),
> >it's just a bunch of "if then else" statements or contact---contact---coil. Just a prettier way of displaying same.
> >
> >I will therefore assume a massive over simplification in your explanation
> >as you seem very strongly convinced that it will be better run by a special engine.
> >
> It helps to know how this is implemented. In an AB controller, each of
> those boxes is a program file, in addition to what he showed, there are
> transition steps. AS a result only a few of the total number of program
> files are being executed at any one time, instead of scanning all of
> them. You can achieve the same thing without SFC, but properly
> structuring your program.
OK, now I'm realy intrigued. Where can I get a book on this SFC stuff.
Dave West E-Mail: [email protected]
Semiras Projects Ltd. PGP public key available on request.
_______________________________________________
LinuxPLC mailing list
[email protected]
http://linuxplc.org/mailman/listinfo/linuxplc