Ran into a weird one this AM which I'd never seen until we upgraded our software and controllers to V14.3.1 and type MQ respectively. One of my controllers lost communications with an intermediate 8-Wide carrier housing 8 120 VAC Isolated input cards. Looked in diagnostics and all eight cards were showing as CFG Present but no card. My first instinct was to change out the carrier, which I did but which didn't rectify the problem. After checking a bunch of other stuff to no avail I decided to download the entire controller, which still didn't rectify the problem. I finally decided to pull the controller off the bus and put it back in. This worked but I'm thinking that the download should have taken care of the problem, or conversely, that it should never have occurred. Has anyone else run into this?
Probably no relationship with your failure and DV version. The issue you describe is related to IOs address bus ( short circuit or open circuit ) . It’s often caused by cables connectors between carriers or at the last pîn connector which should be protected with plastic cover again dust or metal waste. Sometimes in corrosive environments the backplane it self can be dammage, but necessary the backplane where you get issues
also check pin connector behind controller if no one is a lttle bit twisted
Update from Emerson Exchange 365 LaurentB Probably no relationship with your failure and DV version. The issue you describe is related to IOs address bus ( short circuit or open circuit ) . It’s often caused by cables connectors between carriers or at the last pîn connector which should be protected with plastic cover again dust or metal waste. Sometimes in corrosive environments the backplane it self can be dammage, but necessary the backplane where you get issues also check pin connector behind controller if no one is a lttle bit twisted View online You received this notification because you subscribed to the forum. To unsubscribe from only this thread, go here. Flag this post as spam/abuse.
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In reply to patil_chandrashekhar:
In reply to harnettw:
What you have to know that this is a adress buss , consisting on 8 "lines" , for example if the controller want to speak with IO card number 26 , the following bit lines will be put out of high impendance "0001 1010" but for any reason one of bit line is wrong , the card could not be addressed
What I want to say , is that the error observed in one carrier can be generated by failure positionned anywhere on this Address Bus , replacing carrier is not enough, the continuity must be checked from the controller pin mass until the right end of the latest 8wides carrier, including junction cables, inter connexion between rack on din rail
And if the physical issue is on the second rack, this second rack can be OK, the 3rd Not Ok and the following 4, 5 6 ... OK, depending on which address line the faut is
if you tell me the position of you faulty rack I will be able to tell you which bus line is wrong, , but It will not possible to tell you the exact location of the issue.
As previously said the most often case is the latest free Pin connector of the last rack, or on cables connectors or PIN behind the controllers, some times connexion between racks on din rail ( this last case is the worst because impossible to correct it on running plant. This the reason why recommend to check this point on every preventive maintenane done during plant shutdown.
In reply to LaurentB:
Andre Dicaire
In reply to Andre Dicaire:
In reply to Lun.Raznik:
In reply to doug bray: