Jump to content
salb001

"CPU Error Detected" after PLC start-up

Recommended Posts

Hi all,
After downloading my latest changes I get a message on the screen saying

     "CPU Error Detected. Communications with the CPU cannot be established..."

See attached screenshot for details.
I have tried resetting the modules, have checked all the wiring, grounding etc. and can't find anything amiss there. Also, I can revert to an older version of the PLC and it will run for a short time before getting the Error message again.

I'm not an expert with Unitronics but can't seem to find anything relevant in the forums or online. Can anybody shed some light on this?

 

Thanks in advance.

Unistream_Error.jpg

Share this post


Link to post
Share on other sites

Hi guys,

 

Despite the message, this has nothing to do with the CPU, its connector, or any hardware.
In UniLogic version 1.23.25, a certain set of circumstances that involved the 'ACK Alarm' Ladder function called this error message—it's just a minor bug 
J.

It's been fixed

Share this post


Link to post
Share on other sites

I do not believe the bug is completely fixed yet. I started receiving this message after updating the firmware on my USP - 070-B10/B08 by using the  "copy to dok" method. 

The first time i attempted to upgrade the PLC, the upgrade failed (i forgot to reformat the flashdrive to fat32). I made another attempt to update the PLC after formatting the flashdrive to fat 32. The update completed, but upon starting up the "CPU error message" posted in the screenshot appeared... again and again. I have not been able to connect to my PLC to upload my program. Btw, this is my first time using that particular PLC (its brand new). I am using ethernet/IP to connect with it, and before the update, the PLC would be successfully pinged from anywhere on my network. But now, i am unable to get the IP address settings in the uniapps to stick, the fields clear themselves after entering the information. ("CPU IP Config Failed" pops up with description "Unknown error occured" after touching prompt to allow PLC to reset.)

Share this post


Link to post
Share on other sites
11 hours ago, GBerkheimer said:

I do not believe the bug is completely fixed yet.

This possibly may not be the bug at all, but a true problem that is bringing up the same screen because of a genuine error.  The bug incorrectly brought up this screen in certain circumstances of running.  Yours sounds like a corruption issue, and I would be starting again from the very basics.

cheers,

Aus

Share this post


Link to post
Share on other sites
12 hours ago, Ausman said:

This possibly may not be the bug at all, but a true problem that is bringing up the same screen because of a genuine error.  The bug incorrectly brought up this screen in certain circumstances of running.  Yours sounds like a corruption issue, and I would be starting again from the very basics.

I have captured the debug log and sent a copy of my simple application to support. The CPU error occurred before ever downloading my program to the PLC. I have reinstalled the same firmware but the outcome is the same. 

Share this post


Link to post
Share on other sites
10 hours ago, GBerkheimer said:

I have captured the debug log and sent a copy of my simple application to support.

Good.  Please let us know what support say. Hope it is easily fixed.

cheers,  Aus

Share this post


Link to post
Share on other sites
On ‎6‎/‎8‎/‎2018 at 7:32 PM, Ausman said:

Good.  Please let us know what support say. Hope it is easily fixed.

cheers,  Aus

Support said that it is common for CPUs to lose connection with the Panel immediately after applying a firmware update, and that just cycling the power should fix the problem. However, cycling the power did not fix the connection issue, and my ip settings still would not save so I could not ping it from any other device. I did eventually get it to work after performing the following:

1. Forced a reinstall of the same firmware version, but this time I had re-downloaded the firmware onto a different flashdrive that had over 14gb of free space

2. rebooted the device, tried changing the IP address (and apply/reboot system) x2

3. Finally, my laptop pinged the panel, so I tried setting the CPU ip address again and applied the change (reboot)

4. Connected laptop to panel via UniLogic, and downloaded my application ( "Download ALL")

Now I can finally get to controlling several linear actuator controllers via Ethernet (unfortunately no information in the manuals to tell you what the Class and Instance of the devices are though, but Ill contact IAI  (Intelligent Actuator Industrial) if I cant figure it out.

 

Share this post


Link to post
Share on other sites

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now

×