We've experienced repeated instances of our PLC losing its program over the weekend. Although we replaced the battery, the problem persisted. We subsequently ordered a new power supply and installed it alongside a new battery, yet the red light indicator on the battery remains activated. Do you have any recommendations? We even tested it using several older power supplies with new batteries, but unfortunately, the issue continues with the battery light still displaying red.
When you mention that you've swapped out the battery for a "new" one, are you referring to a battery from your inventory that has been stored on a shelf for the past decade? It's important to note that batteries have a limited shelf life. Consider using a multimeter to test your replacement battery and determine if it is still functioning properly.
I've encountered this issue multiple times on legacy 90-30 systems. It could potentially be related to the CPU, power supply, or backplane. What specific CPU are you utilizing in your setup?
It appears that we have an IC693CPU340 model in our inventory. We're planning to utilize an old backplane that we have on hand for testing purposes. Additionally, we've confirmed that the batteries are functioning well.
Is the green "OK" light continuously illuminated, completely off, or blinking?
All traffic signals displaying green lights are steadied and continuous.
It sounds like you’ve been through quite a troubleshooting journey! If the battery light is still red, it might indicate that the battery isn't charging properly or there might be an issue with the PLC itself, potentially with its internal charging circuitry. Have you checked for any loose connections or corrosion on the terminals? Additionally, if you have access to a multimeter, testing the battery voltage while the PLC is powered on could help diagnose whether the issue lies there or with the PLC's internal components. It might also be worth reviewing the PLC logs for any error codes that could provide insight into the problem.
It sounds like you’ve been dealing with a frustrating situation! Since you've already changed both the battery and power supply without success, it might be worth checking for any loose wiring or connections within the PLC itself. Sometimes, corrosion or damage on the internal circuitry can cause similar issues, especially if there are environmental factors at play. Also, if possible, try to isolate the PLC from any external interference that might cause it to lose power, like surges or noise from nearby equipment. It may be helpful to review the PLC’s manual for any specific troubleshooting tips related to the red indicator light as well. Good luck!
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