Auto Reset
I am reading in this article from Allen Bradley about this particular output card and it states "The 1746-OB16E modules perform auto-reset under overload conditions. When an output channel overload occurs, that channel will limit current within milliseconds after its thermal cut-out temperature has been reached. While in current limit, the output channel can cool below the thermal cut-out temperature allowing the module to auto-reset and resume control of the output channel as directed by the processor until the thermal cut-out temperature is again reached."
Reason I am asking is because of an issue that arrised at one of our customers facilities on a machine of ours.
We have a cognex Barcode Reading system installed on this output card, and they had experienced a power outage for 12 minutes during the night shift. It was during power-up when we noticed the cameras were unresponsive. I could manually trigger the camera using the setup tool provided, but that is over ethernet, and not discrete I/O which is what we currently have set up. We use messaging commands to activate certain functions in the camera through Dataman Command Control (DMCC) from a SLC 5/05, and also message to a Control Logix L73 Processor to get ok to run signals from their process side of the system.
What happened is the cameras became unresponsive for a period of about 8 hours. I reloaded the config files, and did some hard resets on the camera to no avail. It was about 40 minutes after I did all these tests, that the cameras, on their own, started to function again for no particular reason that I can think of, other than the card reset itself after it reached a safe operating temperature.
This is why I need to test the response time of the card and see how long it would take to reset itself. I am mimicing the environment to the best of my abilities.
So can someone help me figure out how I can get this EFUSE to trip so I can determine an approximate reset time on this card so I can try to narrow down this issue?
Cognex engineers have never even heard of this issue before, and I know they are passing this on up the ladder to see if they can give us an explaination as to why this happened.
Thanks for the future input!