declare labview data word

[huikim]

Hi there,

I am a new user on labview. Previously a PLC programmer.

I wish to know or is there a sample program for the steps below.

1) declare a local word variable

2) use (read & write) individual bit from the word for programming

adrian

[danil33]

Hi huikim,

              what you are trying to achieve is,you are entering a word into a string control and after running the VI you have to display it in an indicator.Is it??

[huikim]

hi danil33,

would like to individually change the bit status of a word variable.

example, first i need to create a word variable. The i want to change the bit3 of the word from 0 to 1. i.e. 1 word =8bits i.e. bit7, bit 6,.... bit1, bit0.

How can i create the local word & change the status of the bit?

[danil33]

Hi huikim,

               From your explanation I think you are trying to achieve this.If not please tell.

[huikim]

Hi Danil33,

It's not what i actually wanted but thanks for the support anyway. i'll try to figure it out first.

Thank you

[smercurio_fc]

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@huikim wrote:

Hi there,

I am a new user on labview. Previously a PLC programmer.

I wish to know or is there a sample program for the steps below.

1) declare a local word variable

---

There are no variables in LabVIEW. While you can create "local variables", they are a misnomer. They are actually more like shadow copies of front panel controls/indicators. You can create constants. Perhaps this is what you are looking for.

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2) use (read & write) individual bit from the word for programming

---

Boolean functions can be used to do this. They can operate on integers just as well as Booleans. For example, if you have an integer datatype, like an I8 (8-bit integer). You can find out if the 3rd bit is set by simply ANDing it with the value of 4 and seeing if the result is greater than zero (if you want a Boolean yes/no).

To set a bit you'd OR with the appropriate mask (i.e., a mask that has only a 1 at the position you want to set and everything else a 0).

To clear a bit you'd AND with the appropriate mask (i.e., a mask that has a 0 at the position you want to clear and everything else a 1).

[huikim]

Thanks for the information, smercurio_fc 

I also thought of this method & will try to play around with LabView.

One more request. Do you have the instruction list for LabView. List each instruction/module with details desciption & function?

[GerdW]

Hi huikim,

there's the great context help, also available as online help...

[crossrulz]

Since it sounds like you are very new to LabVIEW, you might want to look at some of the online tutorials.