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Messages - BJMarsh

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Technical support / Re:PLC to PLC, Analog issue
« on: July 20, 2010, 12:10:44 PM »
I should ad to that. The analog signal frequency is 1hz, so on the F2424 I have the ADC on a dCuff that is triggered at the same rate. I figured that would give me a flat signal, but the signal still comes in all over the place.

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Technical support / Re:PLC to PLC, Analog issue
« on: July 20, 2010, 11:56:04 AM »
The first PLC writes an analog signal from 0-5V. I was hoping I would then be able to read the analog signal from the second PLC.

Wasn't sure if I would have to read it with a PWM or if the analog to analog would work. The first PLC is a little Arduino board acting as a sensor slave, the second is an F2424, so RS485 is not a built on ability (that I know of for the Arduino).

I am successfully reading the sensors, and then writing the Analog out from the 1st. Where it is failing, is the F2424 cannot seem to read the analog signal.

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Technical support / PLC to PLC, Analog issue
« on: July 20, 2010, 09:14:07 AM »
For my project I required two PLCs, one of which reads a IR thermometer. The second PLC needs that value, so I made the first write an Analog signal so that in theory I could capture the signal on the second and convert it back into the value I needed.

The problem I am having is that the 1st writes a perfect signal, with minimal error, however I can't seem to get the 2nd to pick up the analog signal successfully. The signal cycles through 0 to 4096 continuously. I anticipate a wiring error but I've tried almost everything.

Has anyone been able to get a TRI PLC to read an external analog signal before? I've done it many times with potentiometers and other sensors using the ground and Vs, but I have hit a wall this way.  Thanks for any help!

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Technical support / Re:MLX90614 IR Thermometer
« on: June 29, 2010, 05:55:09 AM »
That is similar to what I had begun attempting, where I am a little lost is the sensor has the SCL and SDA pins, do you think I then need to put the SCL to one of the PWM outputs?

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Technical support / MLX90614 IR Thermometer
« on: June 28, 2010, 07:23:03 AM »
Has anyone tried using the MLX90614 IR Thermometer with any Tri-Plc PLCs? I have been reading up on what people have done using other PLCs, nothing I can find shows a Tri-Plc.

At the moment I am a bit stumped as to how to structure the code using the F2424, so if you have any experience with this component any help would be greatly appreciated as it will save me loads of reading!

http://www.sparkfun.com/datasheets/Sensors/Temperature/SEN-09570-datasheet-3901090614M005.pdf

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