Troubleshooting 1756-M02AE Module: Persistent Red Light Issue and Error on Two Servos

Question:

Hello everyone, I am currently troubleshooting a system that utilizes the 1756-M02AE Module to control Servo 3 and Servo 4. One issue I am facing is that the module consistently displays a blinking red light on the drive, and although I am able to clear the axis fault online, the module fault itself does not clear (see attachment A). I have attempted to resolve this by removing and reinserting the module into the backplane, but this has not made any difference. The fault only clears when I power cycle the panel. Additionally, at times, the module flashes red on both the Drive and OK indicators. I can see the error on the module through Studio 5K (see attachment B), and the issue is resolved temporarily by removing and reinserting the module. Has anyone encountered similar issues with this module, and is there a permanent solution available?

Top Replies

Rockwell Tech note QA229: Export project to an L5K format, then recreate and download the project. There are two distinct technical notes addressing the M02AE error, both suggesting the same solution.

Robertmee highlighted an important Rockwell Tech note (QA229) regarding exporting a project to an L5K file, recreating the project, and downloading it. There are two specific tech notes addressing the M02AE error, both of which suggest this as the solution. It can be seen as a sort of program refresh, similar to an enema for your system.

I want to express my gratitude to everyone. I have just completed a download with the L5K import feature.

Hey there, I've had a similar issue with the 1756-M02AE module in the past. From my experience, a blinking red light often indicates some kind of hardware fault. You could be looking at anything from a communication issue to a module failure. I suggest you try swapping the module with one in a different slot, if possible. That way, you can confirm if it's a backplane issue or a problem with the module itself. Additionally, make sure your firmware is up to date. Sometimes, these types of issues can be fixed with a simple firmware upgrade.

Your issue seems pretty complex, but let's break it down. It sounds like you've already tried a few standard troubleshooting steps. The fact that the module fault clears when you power cycle the panel could indicate a potential issue with the backplane itself or a firmware issue. In the case of the simultaneous flashing red on both the Drive and OK indicators, it could potentially be a glitch or even a wiring mismatch issue between your module drive and Studio 5K. I'd suggest contacting Rockwell Automation or your local distributor to get a diagnosis, and don't forget to check for any firmware updates. Keep us posted on your progress, and good luck!

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Frequently Asked Questions (FAQ)

FAQ: 1. Why is the 1756-M02AE Module displaying a persistent red light issue on the drive?

Answer: - The persistent red light on the drive of the 1756-M02AE Module could indicate a module fault that needs to be addressed. Clearing the axis fault online may not always resolve the module fault, requiring a power cycle of the panel to clear it.

FAQ: 2. How can I troubleshoot the blinking red light issue on the 1756-M02AE Module controlling Servo 3 and Servo 4?

Answer: - Troubleshooting steps may include removing and reinserting the module into the backplane, checking for any errors in Studio 5K, and ensuring proper connections and configurations are in place.

FAQ: 3. What does it mean when the 1756-M02AE Module flashes red on both the Drive and OK indicators?

Answer: - Flashing red lights on both the Drive and OK indicators of the module may indicate a more severe issue that requires attention. Temporary resolution by removing and reinserting the module suggests a need for further troubleshooting to find a permanent solution.

FAQ: 4. Has anyone experienced similar issues with the 1756-M02AE Module, and is there a permanent fix available?

Answer: - If others have encountered similar issues with the 1756-M02AE Module displaying blinking red lights or persistent faults, it may be helpful to gather insights into potential permanent solutions or best practices for resolving such issues

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