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About RandomCST

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  1. Control Cabinet with 1 ProSoft MVI69-PDPMV1 Master and two Siemens 6ES7972-0AA02-0XA0 repeaters feeding 54 Powerflex 40 VFDs.  Over the last couple week's we've been having random motor faults across all sections of the network.  Running ProfiTrace isolated a single run that appeared to be the source of the issue.  After faulting (F071 - Communications loss), restarting would bring up the network again. Yesterday a failure led to a 4 hour downtime where  the network did not recover, and a single VFD was found to have a broken pin to the ribbon cable connecting the 22-comm-p card (2nd up from the bottom). A couple questions.  Has anyone seen a failure on on side of a repeater that would cause VFDs on the other side to fault.  Does anyone have a pinout of the connector for the ribbon cable.   Does anyone have similar experiences with similar or even different root causes.   The big question though, was the broken pin actually the fault, or did we do something to the network (moving cable, reseating connector, etc) that could have returned it to service, and it might be a matter of time before it bites us in the *** again.
  2. Has anyone used 2 Keyence PZ series or similar retroreflective sensors in parallel to detect on the closest distance of irregular shaped objects? It should work if my sensor-fu is correct, but in actual use, has anyone had experience with it, and are there any 'gotchas' to watch out for?
  3. ProfiBus Noise

    RS-485.  Purple cable.
  4. ProfiBus Noise

    On one of our installations we have a noise issue with a long segment of profibus.  Will installing snap-on ferrite cores help, hurt or make no difference.  I've heard both.  One side says proper grounding is more important and that the beads will round off the leading and trailing edges.  The other side says the beads are always helpful in noisy environments.
  5. Dematic PTL

    For the Dematic PTL (Push To Light) systems, does anyone have any information on the protocol used.  I'm assuming it's RS-485 based since the buttons use MAX1487 drivers. What I'm looking for is if anyone has a starting place to look at the handshaking or messaging.