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English Support - Hardware => MFD-Titan® => Thema gestartet von: PI am August 14, 2004, 06:47:37 Vormittag

Titel: How can I built a database
Beitrag von: PI am August 14, 2004, 06:47:37 Vormittag

hello, i need to built a database to open and close a proportionally valve, i am making a demo where i include a proportional valve, so we pretend to use the analog output of the MFD to make a sequence of operations, we need around 10 to 20 stages for this valve

so, if somebody know something, please let me know.......regards :)

Titel: Re: How can I built a database
Beitrag von: julian am August 14, 2004, 16:28:44 Nachmittag

Test this small program with 5 preseted steps.
Use MFD UP/DOWN keys for value selection and OK button for enter.
OK button must pressed twice because it's flip-flop function.
Of course it's expandable for your application and values can be changed quickly.
Regard,
Julian

Titel: Re: How can I built a database
Beitrag von: PI am August 14, 2004, 16:57:51 Nachmittag

thanks,

we also need to configurate the steps acording to the output value, eg. 10% we need an output value of 8mA, 100% a value of 20mA, how can i do this?

regards

Titel: Re: How can I built a database
Beitrag von: julian am August 14, 2004, 19:00:00 Nachmittag

PI,
probably you will need a voltage to current converter,because MFD ana-out is a voltage?
Can you give me the valve P.No. and manufacturer?
I need a second information also.
If the valve is closed (0%),how many current flows in it?
Normally the valve transfer function is a linear one.
In this case we can use the MFD function block (LS) and the program becomes very simple.
Regards,
Julian

Titel: Re: How can I built a database
Beitrag von: Uwe Schröder am August 15, 2004, 19:59:45 Nachmittag

Hello!

They need a CONVERTER!
For example of the company:
PHOENIX CONTACT

MCR-C-UI-UI-DCI


mfG. Uwe Schröder  :) :) :)

Titel: Re: How can I built a database
Beitrag von: julian am August 16, 2004, 09:38:31 Vormittag

PI,
an example using function block LS with 20 steps.
I set for 0% 400mV and for 100% 2000mV.
For overcoming the OK buttons flip-flop function,I added the negative edge trig. marker M03.
Regards,
Julian

Titel: Re: How can I built a database
Beitrag von: PI am August 16, 2004, 10:20:36 Vormittag

thanks a lot,
the valve mentioned is proportional with 4-20mA or 0-10V, depending on the model, manufacturer DANFOSS model i choose is EV260B 20B with coil BM 024 D. This coil is 0-10V.

but now my problem is to configurate 24 values one by one? because we need to repeat this simulation with the same values in order to compare results between two process;  i already did it, and it is working, but it consume to many resourses. i need to know if there is a way to configurate this values by getting them from a list or something like that.

also, i would like to know if there is a way to reduce memory taked by each mask or bitmap? due i tried to show 24 steps graphically and later i realized that i was short of memory to complete the program

regards, PI

Titel: Re: How can I built a database
Beitrag von: julian am August 17, 2004, 21:34:15 Nachmittag

PI,
I don't found any important hint about your database problem in the German forum.
Maybe our moderator will have a solution.
In the manual and EASY-Soft help I could notice bitmaps take a lot of memory.
If possible reduce bitmap size.
Check in the Function block view your blocks and delete unused units.
Delete unused program lines also.
Please try my attached new program version,which allows user settings from 0 to 100% with a resolution of 0.1%,
using UP,DOWN,LEFT,OK and ESC button.
Regards,
Julian