Using an SCP instruction with a 1769-IF8 Analog Module

[lsam]

Transducer is scaled 4-20ma and data format is set to Engineering Units.

 

[Mickey]

Isn't the input range supposed to be 4-20ma since that's what the transducer's output is?

Yes, because the model number you posted says it has a 4-20ma output.

Also,isn't the filter supposed to be set to 60Hz for the good ole USA?

Depends on your noisy environment.

Is the Data Format wrong too - Engineering Units?

Your choice. See pdf

 

[lsam]

I don't understand exactly what you are saying. What you should be seeing when you open the picture that I sent is the following:
1. The first column shows the avaliable Channels 0-7
2. The second column allows the programmer to enable(or not) each individual channel of which I have chosen to enable, with a check in each box, channels 0-4
3. The third column is the input range of which I have chosen4ma to 20ma for each channel(even the channels which I did not enable 5-7)
4. The fourth column is for filtration and I chose 60Hz for all 8 channels even though I am only using channels 0-4
5. And for the fifth and final column available titled "Data Format" I chose Engineering Units for all 8 channels again even though I am using only channels 0-4 thinking that might be the easier way to go.

So, shortly, I will again post the module configuration entitled "1769-IF8 Configuration Tab" for further review. Please let me know if you are still seeing only voltage formatting.

Thanks for your patience,

Lloyd

 

[lsam]

Try this again. Here is the configuration file.

 

[bernie_carlton]

That is a much different picture. Look at Your first picture in your post #9.

 

[lsam]

If what is throwing most of you off is that I have more than one channel enabled, it's because I have a total of five motors that are being monitored by 5 transducers.

 

[lsam]

Sorry everyone - my bad! I don't where that first picture came from in post #9 but it entirely wrong. All channels are set for 4ma to 20ma for the input format.

 

[Mickey]

Picture #3 shows a scaled max at -100. Why not just 100?

 

[Greg Fowlds]

What is the raw value on input 0?
Before it is scaled.

 

[lsam]

The scaled_Max value of (-)100 is an arbitrary value that I placed into the equation to see if the output would change and it did change. I originally started with a value of 50 which gave an output value of (-)2. I know that the current value is going to be more than 2 just by doing the math. So I was just trying to figure why I was getting a negative value. When I make the scaled_Max value negative my output goes positive. And so that's the story of the (-)100.

 

[Greg Fowlds]

What is the raw value on input 0?
Before it is scaled.
With no current through your transducer

 

[bernie_carlton]

Now I am confused by your SCP instruction. Why is the output sent back to the module's Control tag?
I now realize what you were asking in the very first post.

 

[lsam]

If by "input 0" you mean channel 0 and by "raw value" you mean the actual reading with an ammeter before excitement of the transducer, I do not know because all of my multimeters have blown fuses for the ammeter circuitry.

 

[Greg Fowlds]

The value at Local:5:I.CH0Data

 

[Mickey]

Have you measured the actual current flowing thru your input card?

The scaled min and max should match the scaling of your transducer.

4ma = ??
20ma = ??