Dave Posted June 23, 2021 Report Share Posted June 23, 2021 I have a machine with a Unistream 7" modular and some remote I/O attached to a URB-TCP. It has been working fine for about 10 months., but now, occasionally when the machine is powered up, the PLC doesn't establish a connection with the URB-TCP. The hardware model numbers are: Panel: USP-070-B10 CPU: USC-P-B10 I/O Adapter: URB-TCP When it does fail, all the status LED's on the URB are green, except the "Active" LED. I have checked the connections between the URB and the adjacent I/O module and the power supply connections on the front of the URB and they are all good. The cat5e cable between the PLC and the URB has also been verified as OK. The boot-up of the PLC seems to take quite a long time... a little over 2 minutes. Sometimes when it fails, not only does the remote I/O communication not get established, but also a couple of fields on my start up screen don't get populated with the related data. (I have the system tags "Panel SW Version.Unilogic Program Name" and "Panel SW Version.Unilogic Project Version" displayed on the start-up screen). It has, at times, booted up with these fields populated, but still no remote I/O communication. I have not actually been there to hook up my laptop when it fails to see if there are any error codes. The customer "fixes" the problem by powering off/on until it boots up normally. If anyone could shed some light on this behavior, it would be greatly appreciated. At this point, I'm thinking about replacing the CPU, but I am only guessing. Quote Link to comment Share on other sites More sharing options...
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