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Why Do I Get “Out Of Range” Status Message In MAX With My [c]FP-SG-140?

Hardware: FieldPoint>>Analog I/O Modules>>FP-SG-140

Problem:
I have set up my FieldPoint hardware correctly and I can see my configuration in the Measurement and Automation Explorer (MAX). If I click on [c]FP-SG-140, which shows up under the name of my FieldPoint controller in My System»Data Neighborhood»FieldPoint Items, I can see all channels listed. When I click on Start to monitor all input channels, I see the status for each channel change to “out of range”. I also do not have anything connected to the input terminals of the [c]FP-SG-140.

Solution:
The “out of range” status is assigned when the input signal is out of the specified range. The supported ranges are listed on page 1 of the [c]FP-SG-140 operating instructions linked below. If nothing is connected to the module, then the signals on each channel are floating. This results in the “out of range” status. Once you connect a valid signal source, the status of all channels changes to “successful”.

If you connect a strain gauge to your module, and you still get the “out of range” status. Try measuring the output of your strain gauge with a regular voltmeter to see if the value is really out of the specified range. Make sure your strain gauge is compatible with the input ranges of the [c]FP-SG-140. If you keep getting the “out of range” status for no apparent reason, try using your strain gauge with another [c]FP-SG-140 to confirm that there is something wrong with the module.

Overcurrent protection is the circuitry that protects the module from damage caused by current that exceeds the input range. According to page 7 of the [c]FP-SG-140 manual the current limit is 21mA per channel. Table 2 on the same page shows the minimum bridge resistance for each level of excitation. If the bridge resistance is lower than the minimum value for the excitation voltage level, the readings are not valid and the red LED for the channel lights, indicating an overcurrent error. According to that table, the minimum bridge resistant for 10V of excitation is 477 ohms. When the excitation level is adjusted accordingly, the "overcurrent protection" status changes to "successful". Please refer to the manual (linked below) for more details.

Related Links:
Product Manuals: FP-SG-140 and cFP-SG-140 Operating Instructions (October 2002)


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Report Date: 10/15/2006
Last Updated: 04/10/2007
Document ID: 42ECQTLA

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