Hello, I am currently experiencing a discrepancy in the accuracy of my 1734-AENT POINT I/O with 1734-IE2V module when operating at low voltages. Despite sending a stable 874mV signal, the PLC readings fluctuate between 840 and 910, showing a significant 5% variation. However, when a higher voltage like 1.75V is sent, the PLC readings exhibit a more precise 1% margin between 1745 and 1755. This issue appears to be consistent across all my IE2V modules. I am seeking clarification on whether this variance is a normal phenomenon or if there may be an issue with my POINT I/O. Thank you.
Make sure to inspect the earthing system in your setup. In a previous situation, the cable's shield was connected at both ends along with an earth bonding. By disconnecting one end of the shield, it significantly improved the signal integrity. This is a crucial step to take to prevent value fluctuations. Make sure to assess your earthing system for any similar issues that may be affecting your setup.
Parky suggested checking the earthing in your setup. They had a similar issue where the screened cable was connected to both ends, along with an earth bonding. By removing one end of the screen, they saw an improvement in the value swing. It's a recommendation worth looking into. Thank you for the suggestion!
One common issue in AI systems is synchronizing sampling with the phase angle of the AC supply line to maintain consistent noise levels. This synchronization setting usually offers a choice between 50Hz and 60Hz frequencies.
In his comment, danw mentioned the presence of noise in some AI systems. Certain AI models offer a feature that synchronizes the sampling with the AC supply line's phase angle to maintain consistent noise levels. This synchronization option usually includes a selection between 50Hz or 60Hz. Is this synchronization feature referred to as the Notch Filter? Additionally, what does AI stand for in this context?
charlesG123 inquired about the Notch Filter set at 60Hz and the meaning of AI, which likely stands for Analog Input.
From what I've experienced, the variance you're seeing is actually quite common with the 1734-IE2V module at lower voltage ranges. You'll often find that these modules tend to be less accurate at lower voltages due to a phenomenon known as "offset error," which is prevalent in most analog to digital converters. However, if you're getting 5% error, that seems a bit on the higher side - usually you might see something closer to 1-2%. You may want to confirm if all the wiring/signal pathways are free from any potential interference. Also, it would be worth checking the calibration. If the fluctuation exists even after these checks, consider reaching out to the module manufacturer, as there could be a specific issue with your module's hardware.
It sounds like you're dealing with a frustrating issue! Fluctuations like that at lower voltages can sometimes be attributed to noise or the inherent limitations of the analog inputs at lower ranges. In many cases, lower voltage signals tend to be more susceptible to interference, which can definitely impact accuracy. It might be worth looking into the grounding and shielding of your wiring, or even trying to filter out any noise if possible. Additionally, checking if there are any configuration settings on the PLC that could optimize performance at lower voltages could help too. If the problem persists even after those adjustments, consulting the manufacturer for specific diagnostics related to your modules might be a good step.
It sounds like you're encountering a common challenge with low voltage sensing in analog input modules. Typically, these systems can struggle with lower signals due to factors like noise or insufficient resolution at those levels. It might be worth checking the wiring for any interference or ensuring that your grounding is solid, as these can significantly affect readings. Additionally, double-check the configuration settings on your PLC to confirm they’re optimized for low voltage readings. If everything checks out, it might be useful to reach out to the manufacturer’s support for more in-depth troubleshooting or to see if there's a firmware update that addresses this issue.
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Answer: Answer: The accuracy issues you are facing at low voltages could be due to various factors such as signal stability, module calibration, or electrical interference.
Answer: Answer: A 5% variation in PLC readings at a specific voltage level may indicate a potential issue with the equipment or setup. It is recommended to investigate further to determine the root cause of this discrepancy.
Answer: Answer: The difference in accuracy between low and high voltages could be influenced by the module's sensitivity to different voltage levels, calibration settings, or signal processing mechanisms. Further testing and analysis may be needed to pinpoint the exact reason for this behavior.
Answer: Answer: To troubleshoot accuracy issues, you can start by checking the signal stability, verifying calibration settings, examining for electrical interference, and ensuring proper connections between components. Consulting the equipment manuals or contacting technical support for assistance may also be beneficial.
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