topic Re: How do I have to disable objects? in LabVIEW

How do I have to disable objects?

dsdasffdd — Tue, 27 Sep 2005 17:13:15 GMT

Hello,

I'am making a time-switch in Labview. The timeswitch (with just only 1 program) works properly but i have 1 problem
I can't make it work with all the three programs. My intention is that when I click the upper boolean (program 1) that only the two upper time stamps can be adjusted. The other four time stamps should be disabled, but I can't disable them????? Also when I want to run program 2 or 3 it is the intention that the other timestamps will be disabled. Does anyone know a method for my problem. I have tried some case structures but this still doesn't work. Ik have added my VI to this message. I hope that anyone can help me.....

Re: How do I have to disable objects?

Dennis_Knutson — Tue, 27 Sep 2005 17:35:15 GMT

Disabling a control is done with a property node. Right click on a control and select Create>Property Node. Then you right click on the property, choose Change to Write, right click again and choose Propertier>Disabled. By wiring a 0 to it, the control is enabled, 1 is disabled, and 2 is disabled and greyed out. What's unclear to me is how you want to handle the program select Booleans and your "Lamp" indicator. Do you want only one to be able to selected or is any combination valid? Are you planning on having three separate "Lamp" indicators or do you want only one?

Your VI doesn't really do anything unless you run it in continuous mode and that's not they way you want to run a VI. All of what you need to do can be done with a while loop and an event structure. Also, if you only want to be able to select a single program, you might want to use the radio buttons control.

Re: How do I have to disable objects?

dsdasffdd — Wed, 28 Sep 2005 12:53:19 GMT

Thnx U!
With the property node i have made it done

Another question,, maybe you know this:

Does Labview have a component that acts like a adjustable count down timer??? En where can I find this in Labview?

Re: How do I have to disable objects?

Dennis_Knutson — Wed, 28 Sep 2005 13:34:20 GMT

Not sure exactly what you mean. In the context of your example VI, I assume you want to set a target time and as the VI runs, count down to zero. The time stamps are numbers that you can manipulate with the regular numeric functions. Before you run, get the current time (Get Date/Time in Seconds), add the run time in seconds, in a loop, subtract the current time from that. There's also the Elapsed Time function on the time palette. It outputs the number of seconds that have elapsed. You could subtract that from the target time.

Re: How do I have to disable objects?

dsdasffdd — Thu, 29 Sep 2005 07:59:36 GMT

A count down timer is succeeded thank U.

Is it possible to change the "get time/date object". So i can adjust the minutes, hours, seconds??
If not,
Is there an object like the "get time/date object" but then that I can fill in my own time. I ment not the "time stamp control" because this object will not run on himself.
Thanks in advance

Re: How do I have to disable objects?

Dennis_Knutson — Thu, 29 Sep 2005 13:26:45 GMT

Get Date/Time in Seconds always returns the current date. To generate a time of your choosing, you can use a numeric (set formatting to absolute time), time stamp constant/control, or Date/Time to Seconds. I don't know what you mean by "not the "time stamp control" because this object will not run on himself".

Re: How do I have to disable objects?

dsdasffdd — Thu, 29 Sep 2005 14:15:22 GMT

- Can you maybe explain what you exacly mean with: "you can use a numeric (set formatting to absolute time), time stamp constant/control, or Date/Time to Seconds"
Wich object is this and where can i find this??

- I ment by: "not the "time stamp control" because this object will not run on himself" That i'm looking for a object wich displays the time and run on hisself but wich i can adjust with a button..

Re: How do I have to disable objects?

Dennis_Knutson — Thu, 29 Sep 2005 14:58:17 GMT

You want an indicator that displays the current time and then you want to be able to change it so it starts to increment from a new abritrary time? Look at the attached VI and see if this is what you're looking for.

Re: How do I have to disable objects?

dsdasffdd — Thu, 29 Sep 2005 15:19:47 GMT

Thank You! This was exacly what i needed!
Regards Bert

Re: How do I have to disable objects?

dsdasffdd — Thu, 29 Sep 2005 15:33:27 GMT

One little question...

Is it possible to see the time on a 'time stamp indicator' outsite the while loop?? Ik have tried to connect a 'time stamp indicator' to the little brown triangle of the while loop, but it doesn't display the time on my indicator.

Re: How do I have to disable objects?

dsdasffdd — Thu, 29 Sep 2005 15:36:18 GMT

One little question?

Can I see the time on a 'time stamp indicator' outside the while loop? Ik can't see the time when I connect a 'time stamp indicator' on the little brown triangle of the while loop.

Re: How do I have to disable objects?

Dennis_Knutson — Thu, 29 Sep 2005 17:35:44 GMT

It's called a shift register and no you can't just do that. A basic premise of LabVIEW is dataflow. Data is not available from the while loop unitl it finishes. You can put an indicator inside. Is there a specific reason you need it outside?