I'm testing the classicladder on Windows 2000 version 0.7.100
I'd ask if it is possible to create a function block with input/output parameters, in order to use it in different parts of the program avoiding to editing more times the same ladder code.
oh! ClassicLadder 0.7.100 on Windows ? Compiled it by yourself? If you've the sources modified for it (only Makefile perhaps) it could be interesting for other people !
Else, in ladder there isn't really the concept of function block available...
But, perhaps with the "sub-routines" using "indexed variables", you could have something usefull for such cases.
An indexed variable is a variable depending oh the content of another one (the "index")
Example: %MW100[%MW4] will correspond to %MW number 100+value of %MW4
if %MW4 equals 12, it correspond to %MW112.
It can be used to scan a range of variable, or like you as a parameter value for a sub-routine.
A little sub-routine example using parameters with indexed variables
%MW4 => variable to which add value (%MWx)
%MW5 => value to add
Main in ladder (pseudo-code):
Call SubRoutine0 => will add 500 to %MW45
Call SubRoutine0 => will add 250 to %MW32
Little example without a lot of interest, but just to show the principle...
Else, the "indexed variables" usage should be available in the next version !!!
Hope it helps.
Thank you for your answer.
I've modified the source for Microsoft Visual C++ environment.
I'm testing it and I'll be happy to give it if it can be useful.
Can you tell me if is it possible to add some comments in a rung?
It could be useful for the reading of the ladder source.
Any idea when will be available the new version with "indexed variables"?
I think some people are interesting by a Windows version updated (the current using gtk 1 is very very old...). So yes, when finished if you can upload an executable and the sources used for, please do it !
It is possible to have a comment for each rung. There is an edit on top right for that. In the last version, there is a hint/bubble help, and in the example given, there are some comment written.
I think a new version with the "variables indexed" features should come before end of august !
You will find the new 0.7.122 version featuring the "indexed variables" !
Not a lot of tests done, but it seems to work with the little example I've used.
Hope it will be helpfull, it takes a little more time than I were thiking... but well now it's available, and it have to be done!
thanks for your reply.
I've run some test about indexed variales and seem to work.
In order to have a true "block function", probably it needs that also bit variables
could be indexed;is it right?
Do you think is it possible?
An other point that could be helpfull is the facility "cross-reference", in order to have a speed and full visibility of a variable in the ladder design.
I don't know a lot about gtk,
what do you think about this?
The indexed variables are only possible in the arithmetic evaluator: eval and compare blocks. The modifications has been done there: eval + edit parts.
To have them everywhere would means to double all the variables everywhere + test it (little slow down...).
I don't know if in other products it is something they support there...
Perhaps, just to be able to use booleans variables (indexed) in the eval/compar could be a solution!
Yes, cross-reference is very usefull when you don't remember where (or if) a variable is used.
A lot of work to do ! ;-) It can be everywhere (and you have to test that in search function...)
The gtk part if displayed in a text area isn't the real problem!
It is now envisaged at my work too that classicladder could be used to add automation language to a product. I've compiled it fastly with MinGW under Windows, not a lot of difficulties... I will post it soon for download for people intersted.
can you give some information about automation language? Is it something to
help the developer to have a global view of the projet?
In order to have the possibility to "browse" in the project, it could be helpfull a "find function" to search text string in the ladder project, for example in the comment sections.
What do you think about it?
Well automation language, are for me all the types of languages used on PLC and listed here:
ClassicLadder has 2 types usable: ladder and Sequential.
Yes, also a nice idea, that could be interesting to be done.
But, it is really interesting for big programs ! Not sure if someone make one for now with ClassicLadder ?! ;-)
Another interesting link on Wikipedia about automation:
ClassicLadder will not adapted for all the usages listed there ! But for simple ones why not ? ;-)
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