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Badprop · Junior Joined: 10 Jun 2015 Posts: 2

Hi

We are running a control logix PLC system with controlnet. The controlnet has 12 nodes. Uses fiber in between the fiber repeaters .

My main question is about the setup. I noticed in the logix 5000 studio tree that all the electronic keying is disabled. All revisions are are set to 3.1, but the field devices are 4.3 and higher.

NUT = 20ms

ACN RPI = 80ms

IO RPI = 160ms

Current installed Configured (PLC)
Node Revision Type Revision Type
15 4,3 ACN15/C 3,1 ACN15/C
16 10,2 ACN15/D 3,1 ACN15/C
19 4,3 ACN15/C 3,1 ACN15/C
20 4,3 ACN15/C 3,1 ACN15/C
21 4,3 ACN15/C 3,1 ACN15/C
22 4,3 ACN15/C 3,1 ACN15/C
23 5,1 ACN15/C 3,1 ACN15/C
24 4,3 ACN15/C 3,1 ACN15/C
25 4,3 ACN15/C 3,1 ACN15/C
26 5,1 ACN15/C 3,1 ACN15/C
27 10,2 ACN15/D 3,1 ACN15/C
28 4,3 ACN15/C 3,1 ACN15/C

Can this setup cause intermittent communications failures. Comes ON for a second then goes offline. Not every day and not every week.

We sometimes go for a month without a problem and then it starts. Could last for several hours to a couple of days and then go back to normal operation by itself.

Fiber has been tested, all cables and connectors has been checked and cleaned.

PLC is setup, when device fails then set the analog value to full PV. Thats why the spikes are so clear.

So can "Disable keying" and mismatch revisions cause this problems?

Node 16 is the only node reporting Collisions. They start off small value then grows to about over 240 then resets to zero and starts counting.[/img]