Resolving an Allen Breadly PLC Fault: Help Needed!

  • Thread starter Thread starter Arifur
  • Start date Start date
  • Tags Tags
    Fault Plc
Click For Summary

Discussion Overview

The discussion revolves around troubleshooting a fault in an Allen Bradley MicroLogic 1400 PLC, specifically related to an emergency stop condition that prevents the system from resetting. Participants explore potential causes and solutions, focusing on both hardware and software aspects of the PLC operation.

Discussion Character

  • Technical explanation
  • Debate/contested
  • Exploratory

Main Points Raised

  • One participant describes the issue of a blinking fault indicator after an emergency stop, indicating a potential fault that cannot be reset.
  • Another participant suggests contacting MicroLogic technical support, but a subsequent reply indicates that such support is unavailable.
  • Speculation arises regarding whether the emergency stop circuit kills power to the PLC, with a suggestion to check the S: data table for a fault bit that may need to be reset.
  • Concerns are raised about bypassing the fault indicator without addressing the underlying issue, as it may lead to further damage.
  • A participant notes that the fault indicator's flashing suggests an application fault, and they seek advice on minimizing this issue.
  • Access to the PLC program and data tables is mentioned as potentially necessary for diagnosing the problem effectively.
  • A suggestion is made to reboot the PLC by disconnecting power and reconnecting after a brief wait.

Areas of Agreement / Disagreement

Participants express various viewpoints on the nature of the fault and potential solutions, with no consensus reached on the best course of action. Some emphasize the importance of diagnosing the fault properly, while others propose specific troubleshooting steps.

Contextual Notes

Participants acknowledge limitations in their ability to diagnose the issue without access to the PLC software or technical support, and there are unresolved questions regarding the nature of the fault and its implications.

Who May Find This Useful

This discussion may be useful for individuals working with Allen Bradley PLCs, particularly those involved in troubleshooting emergency stop conditions and fault indicators.

Arifur
Messages
8
Reaction score
0
Hi, everybody today I have got a problem in my Allen Breadly PLC which is after getting emergency HMI shows emergency button pressed and after pull the emergency it can't reset and it was noticed that Plc fault indicator shows blinking. I have checked all corresponding issue & make all things right but the fault indicator still blinking.

Anybody please help me to rectify this fault.
Note: The Plc is MicroLogic 1400.

Your co operation will be highly appreciated.
 
Last edited by a moderator:
Engineering news on Phys.org
Arifur said:
Hi, everybody today I have got a problem in my Allen Breadly PLC which is after getting emergency HMI shows emergency button pressed and after pull the emergency it can't reset and it was noticed that Plc fault indicator shows blinking. I have checked all corresponding issue & make all things right but the fault indicator still blinking.

Anybody please help me to rectify this fault.
Note: The Plc is MicroLogic 1400.

Your co operation will be highly appreciated.

Can you call MicroLogic technical support?
 
No technical support is not available here.
 
Pure speculation here...

Does the e-stop circuit kill power to the plc?

If so, on power up when the e-stop was cleared a fault bit may have been set. Check the s: data table for a set PLC fault bit. If the condition is cleared you may be able to simply set it back to 0. Also if it is an ongoing nuisance problem you could SSV the bit to 0 on first scan or power up. Just make sure it is not a "real" problem with the processor or programming.
 
  • Like
Likes   Reactions: berkeman
As Montoya said, make sure it's not a real problem. The PLC is trying to tell you it's broken. Your ability to diagnose may be too limited in the field.

Bypassing the warning without fixing the problem may cause more damage.

Good luck.
 
  • Like
Likes   Reactions: berkeman
Thanks to all of you for help,
but the Plc power is on and the fault indicator floushing, from the Plc manual it's for application fault and it can minimized. So, please help me to minimize this.
If there are any hardware failure then the fault indicator should solid on.

Thanks again
 
Last edited by a moderator:
I understand. PLC power is on and a fault is indicated by a flashing LED on the front of the processor. Everything I said still applies.

Do you have access to the PLC program and can you view the data tables? RSLogix?

If you don't you need to get someone with the ability to access the PLC software. The problem may not be solvable from the normal HMI.
 
In that case, maybe all you need to do is reboot. Disconnect it from all power, wait one minute, then connect again.
 

Similar threads

Potential Difference/Voltage-Graph Help Needed (Long)
  • · Replies 1 ·
Replies
1
Views
2K
Graduate Are Women and New Researchers Shaping the Future of Quantum Gravity Studies?
  • · Replies 24 ·
Replies
24
Views
8K
Kerbal Space Program - Rocket Design Basics
  • · Replies 2 ·
Replies
2
Views
10K
Mathematica This Week's Finds in Mathematical Physics (Week 230)
  • · Replies 1 ·
Replies
1
Views
3K
Mathematica This Week's Finds in Mathematical Physics (Week 230)
  • · Replies 1 ·
Replies
1
Views
4K
News Bush Honest & Trustworthy Until How Many Lies?
  • · Replies 65 ·
3
Replies
65
Views
11K
Mathematica This Week's Finds in Mathematical Physics (Week 264)
  • · Replies 6 ·
Replies
6
Views
5K
Mathematica This Week's Finds in Mathematical Physics (Week 241)
  • · Replies 8 ·
Replies
8
Views
5K
Mathematica This Week's Finds in Mathematical Physics (Week 228)
  • · Replies 2 ·
Replies
2
Views
3K
Mathematica This Week's Finds in Mathematical Physics (Week 228)
  • · Replies 2 ·
Replies
2
Views
4K