control logix msg slc read / write. in a 24 hour period i have 5600 successful and 60 failed. failed with ".err 656" and ".exterr 516" unconnected message timeout. i currently have 72 message instructions that are controlled (dn / er bit executes next msg). i am using clx L75, and en2t module. any suggestions on how to track down where the issue is, backplane, etc.
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