Help please!

PLCgirl · Apr 14, 2003

I'm finally trying to get my analog sensors to work on this plc (micrologix 1200) we have the analog module too. We are using a SCP command but we cannot get the input of this command to work. The error is either the word bit must be specified or something about configuration. Does anyone know what I'm doing wrong. Exactly how do you type in something for an analog input?

Kim Gold · Apr 14, 2003

Without a sample of the code it is hard to say what the problem is.
I will take a guess however. I do not use Micrologix but I have run across this is SLC500.

Try adding a ".0" to your address.
i.e. instead of I:1 try I:1.0

Kim

PLCgirl · Apr 14, 2003

Probably more specifics are needed in this questions

Allen Bradley Micrologix 1200 1762 something series C
The expansion is 1762-IF20F2
The programming sofware RSlogix 500 version 6

My IR sensor is hardwired to input 0

Can anybody help me with these specifics?

PLCgirl · Apr 14, 2003

Thanks kim, but doing it with the 1 in the middle doesn't allow us to verify the rung. But thanks.

Kim Gold · Apr 14, 2003

Which slot is the card located?
What does you SCP instruction look like so far?

PLCgirl · Apr 14, 2003

Unfortunatly I can't show you what it looks like but we finally got the input things to work so we think but we think our parameters might be wrong. What should the input min and max be (we are using voltage)? What is the scaled min and max? We were using some sample programming but we think that there min and maxes might be too much for us. Is there a way to figure out the min in max if they aren't constants?

Kim Gold · Apr 14, 2003

Have you tried the AB.COM web site.

If you select OnLine Manual, then Control Processors, then MicroLogix 1200, then MicroLogix Analog Input/Output Module.

Allen Bradley Manuals OnLine

Kim Gold · Apr 14, 2003

If the Input card is setup for 0-10 Volts:

0 volts should give 0 counts at card and
10 volts should give 32760

What are the specs of the IR sensor you are using?
If it goes from 0 to 10 volts the input min. will be 0 and the input max. will be 32760.

You can put a calibrator on the input card and see what it reads at 0 volts and see what it reads at 10 volts.

The scaled min. and max. will depend on what engineering units you are using.
If scaled min. = 0 and scaled max. = 100, the sensor will be scaled from 0 to 100 percent.

PLCgirl · Apr 14, 2003

Kim you quickly becoming my best friend but I'm not quite there yet. On the IR sensors the max will not get any higher than about 2.65 volts the min is O. Is there a formula that I can plug the 2.65 in to get my max?

There is a 5 volts power supply to the sensors if this means anything

The error is an I/O configuration mismatch

I don't know how to show people exactly what we have but I can tell ya

Input I:1.0 (we are using input 0 of the expansion unit)
Input min is 0
Input max is 32760
scale min is 0
scale max is 100

I have also tried input min as -32767 to 32767 for a max
Our card is set for raw proportional data and is set for voltage reading 0 to 10 volts

Please please please please help me. Yes I'm a student but this isn't for a class. My prof and I are trying to learn analog I/O so it can be incorporated into the curriculum.

Kim Gold · Apr 14, 2003

The min. and max. will still be the same.
When using voltage the card only has 1 setting, which is 0 to 10 volts. This means that at 0 volts you will see 0 counts. At 10 volts you will see 32760 counts.
So at 2.65 volts you will see something in between. You can see that this will effect you resolution.

Put a calibrator on input card:
0 volts = 0 counts.
10 volts = 32760 counts (check this)
2.65 volts = x counts.

Scaled min. = engineering units min.
Scaled max. = engineering units max. at 10 volts.

e.g. Try scaling to 0 to 1000
When input = 0 you should see 0 as output
When input = 10 volts you should see 1000 as output
When input = 2.65 volts you should see 265 as output.

PLCgirl · Apr 14, 2003

We keep faulting ... we go to error and it reads

"I/O configuration mismatch, check module 1. The expansion I/O configuration in the user program did not match the actual configuration, or specified a module that was not found, or the data size for the module was greater than what the module is capable of holding."

we have tried many things and your specific SCP program you showed us (thanks btw). We don't know how to check the card to see hows its reading right, except we have been using a fluke meter to check our voltages.

Kim Gold · Apr 14, 2003

Here is an example using 2.65 volts scaled to 1000

You can see the scaled max. is set to 3775 counts.

2.65 volts = 8681.4 counts approx.
10 volts = 32760 counts

if you set the scaled min. = 0
and scaled max. = 3775,
you can see that when the Input shows 8681 the output shows 1000.
So 2.65 volts should show 1000 or 100% with a decimal point.

I am not sure about you configuration, I'm sure you have gone into I/O configuration and entered proper card in slot 1.
Also you need to go into advanced configuration and setup 0 to 10 volts.

Kim Gold · Apr 14, 2003

I/O setup

Kim Gold · Apr 14, 2003

Advanced Config

Also in the manual it shows that the input card has switches which need to be set to 0-10 volts.

PLCgirl · Apr 14, 2003

For the analog configuration we have no control over it. It will not allow us to chooses anything. Our options are shaded/faded in the back. But they do say the same thing as you have.

We actually just figured this out. But everytime we fault we have to restart the software in order to be able to control this screen. We still don't understand why we are faulting?

Help please!

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