Analog inputs on AB Micro810

scrapjockey · May 19, 2016

Mornin', I'm using an AB Micro 810 (QWB). I'm not able to get the plc to read the analog input (0-10v), the input is acting like a discreet input. Do I have to configure the input in CCW? If so, I can't locate where to do it in the software.
Any help would be greatly appreciated. Thanks.

damica1 · May 19, 2016

OK, so you have an "Analog device" that generates a 0-10v signal and you have it hooked up to the PLC like this.

The gnd or 0v is hooked up to input(com0) and the positive end would be hooked to input (I:00, I:01, I:02, I:03)

Now this is a 12 bit value so the raw read will be 4096.

Now in CCW are you sure you are working with the "Analog Input" address?
It will be "_IO_EM_AI_00" or _IO_EM_AI_01" and so forth.

scrapjockey · May 19, 2016

Yes, that's how I'm set up. The device is wired to "_IO_EM_AI_00".
The input status shows an input when my device reaches aprox 6V, instead of scaling with the input.

damica1 · May 19, 2016

I'm also assuming your analog device is "linear".

I would setup a rung with "Any to Real" function block, and then I would probably use a scaler with my min-input = to 0(zero) and my Max-input would be 4095)

My min-output and max-output would be what ever I'm trying to read "Temperature", "Pressure".

Don't know why your starting at 6 v unless it's a temperature sensor and that would probably be your room temp.

I would be happy to send you and example if your want one. I use a lot of 0-10v current sensors to measure the current on our 460v 3 phase motors.

tom_stalcup · May 19, 2016

scrapjockey said:
Yes, that's how I'm set up. The device is wired to "_IO_EM_AI_00".
The input status shows an input when my device reaches aprox 6V, instead of scaling with the input.

When you say "input status" what exactly are you referring to?

Boorabee Parker · May 19, 2016

damica1 said:
I'm also assuming your analog device is "linear".

I would setup a rung with "Any to Real" function block, and then I would probably use a scaler with my min-input = to 0(zero) and my Max-input would be 4095)

My min-output and max-output would be what ever I'm trying to read "Temperature", "Pressure".

Don't know why your starting at 6 v unless it's a temperature sensor and that would probably be your room temp.

I would be happy to send you and example if your want one. I use a lot of 0-10v current sensors to measure the current on our 460v 3 phase motors.

I have done the same as this test all my AI (about twenty) on a recent project. Worked well. I could then check what my AI read and scale my HMI to read the same. Edit this was on an 850 model.

scrapjockey · May 20, 2016

Problem solved. After further research, I moved the device to terminal I:04 and everything is responding as expected. I assumed AI_00 would correspond to terminal I:00 on the plc. Rookie mistake, lesson learned.

Thank you to all who responded.

Analog inputs on AB Micro810

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