adccommunitymod (AutomationDirect) asked a question.
EZ Touch "Write Queue Overflow"
Created Date: September 19,2006
Created By: fequihua
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Using EZ Touch 10 " HMI, Every once in a while I get an error message saying "write Queue Overflow ". What could be the cause of this problem and how can it be cured? searching for queue overflow on the automationdirect website, I was led to the error codes of the ethernet card, where it said to check for significant bandwidth, but I know that should not be an issue.
Created Date: September 19,2006
Created by: Tech Guy
"Adapter write queue overflow "
This error means that the EZ Touch panel is writing write requests into the EZ Ethernet/EtherPLUS's queue faster than the EZ Ethernet/EtherPLUS is able to empty them out via write requests to the ECOM. This can especially happen if the situation is busy (see above suggestions for "Write tag retry count exceeded ") and if there are writes from the EZ Touch for recipes. The write queue is only 25 requests in size and a recipe can be up to 20 requests. The EZ Ethernet/EtherPLUS has to guarantee that these recipe writes get to the PLC, so if they cannot, then the requests are reentered into the write queue to try again. So if things are busy, then this error can happen. Thus, again, try the above things.
Please check your EZ-ETHERNET firmware for the latest version.
Created Date: September 26,2006
Created by: GKiser
Originally posted by Tech Guy:
...(see above suggestions for "Write tag retry count exceeded ")... "
Those "above suggestions " are:
- Does the EZ Touch project have more than one screen? (If it does, there was a bug in EZ Ethernet v1.0.0e. Newer firmware than this one can be downloaded from our website.
- Is the network bad or network situation bad?
- Is the PLC scan time excessively large? (Try putting PLC in STOP mode; reduces scan time to 0).
- Does the EZ Touch have an excessive number of tags on a single screen? (Especially if they are noncontiguous locations?)
- Is the network hardware OK? (Replace hub? Switch?)
- Try increasing the Timeout for the node in EZ Touch software.
- Consider using multiple ECOMs for different EZ Ethernet/EtherPLUS cards.
- If using multiple ECOMs, consider using isolated networks.
- Use a hub instead of a switch, or vise versa.
And this information comes from Host Engineering website (hosteng.com) EZ Ethernet FAQ0006. Goto Products --> Hardware --> EZ-Ethernet and then scroll down to FAQ0006.
Best regards,
Greg Kiser
Host Engineering, Inc.
support@hosteng.com
Created Date: September 19,2006
Created by: fequihua
Using EZ Touch 10 " HMI, Every once in a while I get an error message saying "write Queue Overflow ". What could be the cause of this problem and how can it be cured? searching for queue overflow on the automationdirect website, I was led to the error codes of the ethernet card, where it said to check for significant bandwidth, but I know that should not be an issue.