Using an SCP instruction with a 1769-IF8 Analog Module

lsam · Aug 21, 2013

Could someone tell me which of the available tags in a 1769-IF8 analog module is typically used for the output of an SCP instruction. I am currently using the following tag for the input.

Local:5:I.CH0Data

Any Good thoughts anyone?

Donnchadh · Aug 21, 2013

Hi

That's correct are you reading any values maybe you expand
More if it's not working

Donnchadh

lsam · Aug 21, 2013

I am getting a reading of -2 and I would have thought to have seen a reading of somewhere in the neighborhood of about 10 to 12.

This instruction is for reading the amount, in Amperage, of dc being used by either a 12vdc or 24vdc motor. I am using a transducer with an output scale of 4-20ma. The transducer is connected to a 24vdc - 100amp power supply. The SCP instruction is scaled from 0 - 50. The 12vdc motors typically draw about 12-15amps and the 24vdc motors typically draw about 8-10amps. That's why I was hoping to see a reading of about 10-12 instead of -2.

lsam · Aug 21, 2013

I tried changing the "scaled_Max" value from 50 to -50 and now I get a positive 2 reading. Does anyone have any idea why this happened? I ran the #8761 Belden shielded cable just like was suggested in the analog module manual, connected the black wire to the (-) output terminal on the transducer and the V/Iin0(-) terminal on the module. Then I connected the clear wire to the (+) terminal on the transducer and the Iin0(+) terminal on the module. Lastly, I connected the drain wire, on the module end of the cable only, to chasis ground(the closest thing to an earth ground since this equipment is mobile). This is not the power Supply negative.

If I decrease the "scaled_Max" value to (-)100, the resulting output value increases to "5".

Is this normal or what?

Mickey · Aug 21, 2013

Post your program, zip it first and someone with the software can take a look.

Tell the forum how the transducer is scaled 4ma = ??, 20ma = ?? in engineering units.

If you can't post the programming then post a snap shot of how you have the card configured and your SCP instruction.

Greg Fowlds · Aug 21, 2013

Is the transducer 2 wire only?
If so it will need 24v supply.
+24v --> + of transducer
- of transducer --> + AB module input.
- of AB module --> Neg of 24v.

Look at the raw value from the AB card?
What is the value?

lsam · Aug 21, 2013

No. It's a 4-wire Automation Direct AcuAmp DCT200-42-24-F Fixed Core DC Transducer. I'll post a snapshot of the module configuration, the instruction, and a snapshot of part of the actual program shortly.

lsam · Aug 21, 2013

Here are three attachments including module configuration tab, SCP Instruction, and a sampling of the code that I am working with. The company's laptop does not the availability of zipping a file but at least I can take screen shots and it doesn't lockup half way through the uploading/downloading process. Just looking for the positive things!

lsam · Aug 21, 2013

Oops! I forgot the attachments!

Here are three attachments including module configuration tab, SCP Instruction, and a sampling of the code that I am working with. The company's laptop does not the availability of zipping a file but at least I can take screen shots and it doesn't lockup half way through the uploading/downloading process. Just looking for the positive things!

bernie_carlton · Aug 21, 2013

Why is your configuration for voltage if you have a current input?

lsam · Aug 21, 2013

Where is it configured for voltage?

bernie_carlton · Aug 21, 2013

In your first picture.

Mickey · Aug 21, 2013

Tell the forum how the transducer is scaled 4ma = ??, 20ma = ?? in engineering units.

Also provide the above.

lsam · Aug 21, 2013

Being that this is my first solo project since leaving the classroom this past Spring, I'm at a loss for an explanation.

Isn't the input range supposed to be 4-20ma since that's what the transducer's output is? Also,isn't the filter supposed to be set to 60Hz for the good ole USA? Is the Data Format wrong too - Engineering Units?

bernie_carlton · Aug 21, 2013

All of your enabled channels are set to -10 to +10 Volts. The only settings for 4-20 ma are on disabled channels. You have indicated that you are using channel 0. It is set to -10 to +10 volts.

Using an SCP instruction with a 1769-IF8 Analog Module

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