You are not registered yet. Please click here to register!

plc storereviewsdownloads
This board is for PLC Related Q&A ONLY. Please DON'T use it for advertising, etc.
Try our online PLC Simulator- FREE.  Click here now to try it.

---------->>>>>Get FREE PLC Programming Tips

New Here? Please read this important info!!!

Go Back - Interactive Q & A > - Interactive Q & A > LIVE PLC Questions And Answers

PLC training tools sale

Thread Tools Display Modes
Old July 24th, 2003, 12:03 PM   #1
Posts: n/a
Ab Plc5 Rio Adapter Fault

I have the below LED sequence in our RIO Adapter :

Active (Green) : Blinking

Adapter fault (red): ON

I/O rack fault : OFF

RIO user manual 1771-UM001A-US-P- February 2000 says (Page no. 59 / Troubleshooting):

Module Identification Line fault

Probable cause :
Excessive noise on Backplane

Recommended Action:
Identify source of noise. Check powersupply incomming ac power with a line disturbance analyser. Monitor scanner channel for retries to determine if noise is entering the RIO cable.Possible problem with block transfer module. Remove to Isolate.

My comments:
We donot have any Block transfer module(like analog module) in that rack. This RIO rack has been operating for past 6 years without any problem.

Details of cards present in this rack:

Slot 0 : RIO Adapter
Slot 1 & 2 : 1771-IADK (16 pt. 120vac input module)
Slot 3 : 1771-IBD ( I am about to install this module in slot 3 within few days when we have shutdown but then found the above module fault.I havenot installed this module yet.
Slot 4 to 6 : 1771-ODD ( 16 pt. 120Vac isolated input module)
Slot 7 to 8 : 1771-OW16K ( 16 pt. contact output)
Slot 9 to 12 : Empty

Now how can i clear this fault. As said i read the above manual and i realy donot know what i should after reading that. So need your help.

My processor Cat no.1785-L60's Channel 1B is Blinking (it is configured as RIO Scanner) and i understand that its blinking because of my RIO adapter fault.

Can i clear this fault by connecting my PC to CPU and which bit should i reset to clear this fault online without shutting the power to rest of the system.

My fear is whenever the CPU has a fault i just connect my PC to DH+ port and go online and just click clear fault (yes before that i read the fault and then only i clear it). But in this case, the processor is not faulted but only the RIO adapter so just hint me how to do this.

Thansk ALL
  Reply With Quote
Old July 24th, 2003, 07:14 PM   #2
United States

rogerhollingsworth is offline
rogerhollingsworth's Avatar
Join Date: Nov 2002
Location: Southern Ohio.
Posts: 385
The green blinking LED is telling you that you are not communicating between the ASB and the PLC. Check your blue hose for proper connection (1-blue, sh-shield, 2-clear), recycle power to the ASB, see what happens.

  Reply With Quote
Old July 25th, 2003, 06:01 AM   #3
Posts: n/a
thanks for the post.
Yes i understand the green blinking led. MY cable are intact there is no lose connection.
My question is why am i getting this fault after 6 years and what would have caused this problem and how to avoid this problem in the future.

The adapter to cpu cable is intact.

  Reply With Quote
Old July 25th, 2003, 11:54 AM   #4
Posts: n/a
Can you describe what is going on prior to getting the fault?
Is the fault always there?
Does it come & go or what?
  Reply With Quote
Old July 25th, 2003, 10:27 PM   #5
United States

rogerhollingsworth is offline
rogerhollingsworth's Avatar
Join Date: Nov 2002
Location: Southern Ohio.
Posts: 385
Has anyone installed any devices or DC relays in the cabinet just prior to the starting of the problems? Making/breaking of relay contacts carrying DC will cause the ASB to fault. Put suppression on any such contacts.(RF signals)
Any welders/ welding cables or high current devices in close proximity to the ASB or its communications wire? (anywhere in the run)


Last edited by rogerhollingsworth; July 25th, 2003 at 10:34 PM.
  Reply With Quote
Jump to Live PLC Question and Answer Forum


Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Forum Jump

Similar Topics
Thread Thread Starter Forum Replies Last Post
RSLogix User Fault Routine jthornton LIVE PLC Questions And Answers 17 October 23rd, 2008 03:55 PM
AB PLC5 RIO Adapters & Steeplechase plsticsman LIVE PLC Questions And Answers 0 November 12th, 2004 03:59 PM
AB PLC5/80B RIO Flex IO Fault corkers LIVE PLC Questions And Answers 9 September 4th, 2004 02:12 AM
Ab Plc5 Rio Problem. fernandes LIVE PLC Questions And Answers 5 March 7th, 2004 02:25 PM
AB RIO Again Jezz LIVE PLC Questions And Answers 7 December 9th, 2003 03:47 PM

All times are GMT -5. The time now is 08:11 AM.