IsNAN

[padees]

We often must design for the lowest common denominator.

The program I wrote for this system is actually quite outstanding. I'm just dropping in the fluffy parts and removing programmers stuff.

 

[padees]

Yea, thats handy.

I wish RA had one like that, basically a NOTE instruction just to bring a value to the surface where you need it.

The way I am using it, it is technically a Note instruction.


Figured I should toss that in...

 

[padees]

I agree it would be nice to be able to show data values in the rung comments, sort of like a mini HMI in the middle of the ladder logic. The software lets you save watch lists, imagine being able to embed a watch list in a rung comment.

This is part of why I am doing this. See what's happening without flipping thru a bunch of stuff.


I did a robot cell last year in similar fashion, and that's their new standard. It makes it easy for maintenance and robot programmers.

 

[padees]

I'm just waiting on Dr.BitBoy to chime...

 

[drbitboy]

I'm just waiting on Dr.BitBoy to chime...

Who am I, the Oracle at Delphi?

Anyway, I think it's a neat hack. MOV would work, as would any compare instruction, or a CLR with an XIO/XIC pair on some bit at the front of the rung.

But IsNAN minimizes the vertical and horizontal screen real estate used up.

 

[padees]

Who am I, the Oracle at Delphi?

Anyway, I think it's a neat hack. MOV would work, as would any compare instruction, or a CLR with an XIO/XIC pair on some bit at the front of the rung.

But IsNAN minimizes the vertical and horizontal screen real estate used up.

I forgot to put in LOL. LOL!


Anyway, I just wanted to find the most benevolent, single item instruction I could find, that doesn't really do anything, but hold the tag for display in logic. That way, no need for 2 part items where you have to create new tags.

 

[padees]

A MOV instruction with the same variable for both the source and destination should do the same thing.

I've done that before, and it does as you say.



I think the IsNAN removes a level of confusion someone might have, because there are hundreds of MOV instructions in this program already.

 

[drbitboy]

I forgot to put in LOL. LOL!

me2! LOL!

Anyway, I just wanted to find the most benevolent, single item instruction I could find, that doesn't really do anything, but hold the tag for display in logic. That way, no need for 2 part items where you have to create new tags.

well done!

 

[padees]

Thank you for your replies. It is kinda a neat tool to use. I'll bet Rockwell reads this and, [slap on forehead] why didn't we think of something like this? Ha!

 

[padees]

I agree it would be nice to be able to show data values in the rung comments, sort of like a mini HMI in the middle of the ladder logic. The software lets you save watch lists, imagine being able to embed a "watch list" in a rung comment.

That would be nice!