Experiencing a recurring issue with a 1756-L85EP CPU, where online edits to PLC code sometimes result in a major fault upon downloading. The fault, identified as type 1 code 61 (Power-Up fault - Non-Recoverable fault), is occurring randomly despite upgrading firmware to version 34.014. Seeking solutions or insights to address this issue.
Are you equipped with a fault handler for your project?
JeremyM inquired about the presence of a fault handler in your project, indicating the possibility of one being in place. Can you identify the root cause of the issue, or suggest an effective fault handler to prevent future occurrences?
Leo_pinho23 inquired about the potential causes behind a particular issue and suggested implementing a fault handler to capture details of the fault. While this won't prevent the fault from occurring, it provides an opportunity to gather information about it. Adding a program to the controller Fault Handler in the tree can help in this regard.
Refer to page 16 of this manual for detailed instructions on how to proceed. This section contains valuable information that will guide you through the process effectively.
Leo_pinho23 shared the following issue with his 1756-L85EP CPU: despite performing online edits on the PLC code, the CPU occasionally experiences a major fault upon downloading, specifically a type 1 code 61 - Power-Up fault. Despite updating the firmware to version 34.014, the issue persists intermittently. In my own experience, I encountered this fault multiple times while editing basic ladder routines. To resolve the problem, I exported the code to an L5X file and re-downloaded it. The 1-61 fault is a non-recoverable fault that does not provide specific information on the issue. I had a fault handler program designed to log faults to an SD card, but it failed to record anything in my case.
It sounds like you've already taken a few standard troubleshooting steps, such as updating your firmware, which is great. However, based on your description, this could actually be due to the CPU having some hardware related problem, rather than an issue with your code or firmware. I'd recommend checking your set-up for any signs of physical damage or perhaps even overheating related issues. It may also be due to an unstable power supply, so I'd suggest checking the voltage levels. If the problems persist, you might need to look into possibly replacing the CPU.
I've encountered similar problems before, and in my case, the issue was caused by redundant code or block calls that the CPU couldn't handle. It can also happen if there's a major deviation from the PLC scan time. Since the issue is sporadic, my suggestion would be to thoroughly check if there's any block or instruction causing the CPU to overload. Lastly, involving Rockwell support might provide a more detailed analysis as they've got tools to more deeply diagnose the fault codes.
It sounds frustrating to deal with that fault, especially after a firmware upgrade—those random issues can be the trickiest to pin down. Have you tried checking for any hardware anomalies, like loose connections or overheating? Sometimes, the physical environment can contribute to unexpected faults. Also, if you haven’t already, try doing a bit of a clean slate by clearing any unused tags or structures in your program; it could help streamline the code and possibly prevent those major faults during edits. Good luck!
✅ Work Order Management
✅ Asset Tracking
✅ Preventive Maintenance
✅ Inspection Report
We have received your information. We will share Schedule Demo details on your Mail Id.
Answer: - The Power-Up fault T1:C61 is a Non-Recoverable fault that occurs randomly after making online edits to the PLC code, even after upgrading the firmware to version 34.014.
Answer: - To address this issue, you may need to explore potential solutions such as checking for compatibility issues, reviewing the online edits process, or seeking insights from the Rockwell support community.
Answer: - Troubleshooting steps may include verifying the integrity of the PLC code after online edits, ensuring proper communication settings, and monitoring the system for any anomalies that could trigger the fault.
Answer: - It's advisable to check with Rockwell's technical support or online resources for any official guidance, updates, or known resolutions related to the recurring Power-Up fault T1:C61
Join hundreds of satisfied customers who have transformed their maintenance processes.
Sign up today and start optimizing your workflow.