Hello everyone, I hope I am clear in explaining my situation. Please feel free to provide feedback if needed. I am facing a mysterious issue that I can only describe as "chasing ghosts." Several processors are generating a 0379h fault, specifically at the third expansion module, which happens to be a thermocouple module in our setup. This fault occurs randomly across multiple units, and we are struggling to pinpoint the root cause. Although we can temporarily clear the fault and resume normal operations, it tends to reappear on different processors. Rockwell has recommended updating our firmware, but we are open to any additional troubleshooting suggestions. Your input on where to begin investigating would be greatly valued.
To ensure optimal performance, monitor the status of the I/O module through the IOS file for any potential issues such as open circuit, overrange, underrange errors, or CJC (cold junction compensation) errors.
I have a follow-up inquiry regarding checking the status file of the I/O module. Can this information be located in RS Logix 500? I am new to this topic, so I appreciate your understanding.
It appears that we are facing a common hardware issue with limited information provided in the extended fault details. How should we go about resolving this situation? This problem seems to affect multiple PLCs, all of which are newly installed. Instead of replacing multiple T/C modules for each line, perhaps we should consider exploring alternative temperature controllers. Could this issue be related to the 1400 processors or is there a possibility of interference from electrical noise or power fluctuations?
Have you been utilizing grounded thermocouples in conjunction with your modules? I have limited experience using the T/C module with a 1400, but have faced challenges with other modules due to noise interference transmitting back to the card through grounded thermocouple tips.
Quite the conundrum you've got there! While flashing the firmware as recommended by Rockwell might help, I would suggest simultaneously checking the grounding and wiring of the thermocouple modules. There's a possibility that environmental factors such as power fluctuations or electromagnetic interference could be causing the random errors. It's also prudent to ensure that these modules are correctly configured and compatible with the processors. Don't forget to thoroughly document where and when these faults occur. This might help you spot a pattern or a common factor linking these instances together.
Hey there, it does sound like you are indeed "chasing ghosts" with this issue. Given my experience with similar situations, I'd first suggest double-checking the wiring on your thermocouple module in all the units showing this fault. Loose or faulty wires can cause random problems like this. Secondly, while it may seem unrelated, consider checking the ambient temperature of the room housing your processors. Sudden temperature changes might influence the thermocouple readings and subsequently cause faults. Lastly, though it might be a long shot, check for any potential electromagnetic interference. Unusual random errors like these can sometimes be traced back to EM interference. It doesn't hurt to try these while you sort out your firmware update with Rockwell. Hope this helps.
It sounds really frustrating to deal with the intermittent 0379h fault, especially when it's linked to a specific module. Since Rockwell suggested a firmware update, I'd definitely recommend starting there, as it's often a catch-all fix for quirky issues like this. Beyond that, consider checking the wiring and connections for any signs of wear or loose connections, especially since thermocouples can sometimes be sensitive to environmental factors. I’d also suggest monitoring the temperature readings closely during operation to see if there's a pattern associated with the faults. Hopefully, you can uncover the ghost in your system soon!
It sounds like you're dealing with quite a frustrating issue! Given that the 0379h fault is appearing randomly across multiple units, I'd suggest looking into any potential grounding issues or electrical noise that could be affecting the thermocouple module, especially if all your units are in similar environments. Also, ensure that all connections and terminations are secure, as intermittent faults can sometimes be traced back to loose wires. If Rockwell's firmware update is on the table, that might be a good first step since it could address underlying firmware bugs, but also consider inspecting the thermocouples themselves for any signs of wear or damage. Good luck—hope you find the source soon!
It sounds like a frustrating situation! Since the fault occurs randomly and affects multiple units, I’d recommend checking for any interference that may be affecting the thermocouple signals, like nearby electrical equipment or faulty wiring. Given that Rockwell suggested a firmware update, it might also be worth reviewing the release notes for any known issues related to the specific fault code you’re encountering. Additionally, if possible, try swapping out the thermocouple module with a known good one to see if the problem persists; sometimes it’s a simple hardware issue that gets overlooked. Good luck, and I hope you get to the bottom of this soon!
It sounds really frustrating to deal with that intermittent 0379h fault, especially when it's popping up in different units! Before diving into the firmware update, you might want to check the connections and wiring for that thermocouple module, as loose or damaged wires can often lead to these kinds of intermittent faults. Also, consider isolating the module—if you can, swap it with a known good one to see if the fault follows. Sometimes grounding issues can also create ghost signals, so assessing the grounding and shielding of your setup might help narrow down the culprit. Good luck!
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Answer: - The 0379h fault on a MicroLogix 1400 thermocouple module typically signifies a fault or error condition that the system has encountered.
Answer: - The random occurrence of the 0379h fault across multiple processors with the third expansion module suggests a potential issue with the hardware or communication between the module and the processors.
Answer: - Possible troubleshooting steps may include checking for loose connections, verifying proper module configuration, ensuring adequate power supply, updating firmware as recommended by Rockwell, and inspecting for any environmental factors that could be contributing to the fault.
Answer: - Identifying the root cause of the 0379h fault may involve systematically testing different components, monitoring system behavior, collecting data during fault occurrences, and possibly seeking further assistance from technical support or Rockwell experts.
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