Studio 5000 Analog Output Logic Help

[Jim Diesel]

Hey guys,

I'm a novice programmer and looking to learn how to create logic for an analog output to control a VFD. I've taking the Logix Designer level 1 CCP 299 & Logix 5000 Programmer Certificate CCP 250. Those classes never went into logic for AI/AO control.


I need to program logic so that I have two set points for speed. I thought I could just use a Bit to control a Move function, use the Source as a INT and the Dest the Analog Output. I tried this with a project I had on my PC, I noticed when I built the logic it showed as an error. What would be the best practice on creating logic for this and I'm pretty sure I've seen RS500 logic that worked as a Bit and MOV.

Thanks

 

[Ken Moore]

What is the scaling of your AO card set for?
I usually do mine 0-100% = 4-20mA
You also have to make sure the AO limits match you output parameters.
Most AO card channels are REAL numbers, you need to make your setpoints REAL also.

 

[Mispeld]

The ".1" at the end of the address is indicating a boolean type for the destination.

 

[A_G]

Check the scaling of the analog output channels you are using (like Ken Moore said). Right click on the module (module 8) and go to Properties.

Also I think the correct way to select a channel is "Local:8:O.Ch1Data" not "Local:8:O.Ch1Data.1", this might be why you're getting the rung error. (I'd check it for you myself but I don't have RSLogix software right now.)

 

[Jim Diesel]

That was it, I removed the .1 and the error went away. Thanks Guys!!

Ken, Thank you!! I will fix that as well!