Node 51 (AC800M) is not visible on Network RNRP list

During my daily check on system I noticed that all my AC800M controllers are visible on RNRP list apart from Node 51. We used Node 51 only for Serial Link signals from 3rd part equipments on our asset. I have done on investigation on this matter and used RNRP Fault Tracer tool for monitoring and found this message:

** Incorrect Subnet Mask for 172.16.68.151 (IP Address of Node 51)

Just for info: IP Subnet mask: 255.255.252.0 (default)

I have done the comparsion between Node 51 and Node 52 (which is visible on RNRP) and identified with the same settings.

You recommendation would be helpful to sort out this issue.

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Farid Rank: 1256

Asked 3 years ago

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Is this a new problem with this controller, or has it never been active on RNRP?

I've never seen the "Incorrect subnetwork mask" without a reason.

Where did you check existing network settings? Control Builder project? Can it be so that the controller *is* running 255.255.255.0 but has been downloaded with 255.255.252.0 and is since waiting for a controller reset (which is required when changing IP-setting)?

Try checking the controller log - if there has been little output you may be able to see the *current* IP-settings which is written to the log when controller has started, perhaps it is running with 255.255.255.0 - if so, schedule a controller reset when process conditions permit.

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Stefan Stromqvist AKS expert

Rank: 1

Answered 3 years ago

Yes, Sir, it has recently happend and noticed just a week ago. Before it was on the list.

Yes, I have checked the controller settings like the chain below:

** Controller>Hardware AC 800M>PM866>Ethernet

** Ethernet details: IP address: 172.16.68.151

IP Subnet mask: 255.255.252.0 and etc.

I got your point about IP config, dont know to be honest. Because I have also checked the controller log and found such an message from comissioning time:

** I 1979-12-31 00:00:00.517 Network Interface 172.16.68.151 (255.255.255.0 )

** I 1979-12-31 00:00:00.525 Toolport IP adress 192.168.255.254 (255.255.255.0)

** E 1979-12-31 00:00:04.701 RNRP Config error: Incorrect Subnet Mask for 172.16.68.151 LP=260

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by Stefan Stromqvist AKS expert

Rank: 1 on 5/8/2016 2:01:46 AM | Like (0) | Report

Date/time is 1979... when information is not available (cold start with no battery) - hence, the information you see could be from last reset.

However, if *this* controller was up on RNRP some time ago IP settings should be OK.

Do you have 100% info of when/who/why last reset/download was made?

If controller is running 5.1 firmware you can pull Ethernet info from CBM->Remote System->Controller Diagnostics->(Get)Network Information.

by Farid Rank: 1256 on 5/8/2016 3:14:26 AM | Like (0) | Report

Last time I downloaded the controller 2 months ago but for absolutely different job. And even after this modification Node 51 was on the RNRP list. It just disappeared 2 weeks ago.
I got the network information through controller analysis, but there is only today's activity, nothing more.

by Stefan Stromqvist AKS expert

Rank: 1 on 5/8/2016 3:26:54 AM | Like (0) | Report

Could you see the active subnetwork mask in the diagnostics?

A mask does not change by itself - a wrong setting is most likely due to a human error.

Just remember; whatever IP-setting you download it will not take effect until controller is reset.

It easy to think that the setting is allright by looking at the figures in CBM - but the controller may be running a different netmask because no reset was made at last download.

Store the controller log and Network Information - possibly you must file a support case with regional ABB support center. They will probably ask for the logs then.

by Farid Rank: 1256 on 5/8/2016 5:20:36 AM | Like (0) | Report

There is this note in the diagnostics:
Netmask 0xffff0000 Subnetmask 0xffffff00

Thank you very much for your useful comments, Sir. Much appreciated!

by Stefan Stromqvist AKS expert

Rank: 1 on 5/8/2016 5:51:51 AM | Like (0) | Report

No need to Sir a simple support engineer - lets leave the titles and greetings to the managers... :-)

Good work Farid!

Controller is actively running 255.255.255.0 (0xffffff00) and waiting for controller reset to change to 255.255.252.0 (0xfffffc00).

For a controller to change from 252 to 255 there are only a few possibilities:

1) Controller was downloaded with 255.255.255.0 by someone. Control Builder M leave log file(s) in C:\ABB Industrial IT Data\Engineer IT\CBM...\LogFiles. Maybe you can find evidence of download in some engineering station? If system is running with audit trail (license required) download will leave audit events.

2. Controller has been replaced with spare hardware; the new hardware was pre-configured with IPConfig tool (serial cable) with wrong subnetmask and no controller reset was made after CBM download.

by Farid Rank: 1256 on 5/8/2016 6:56:21 AM | Like (0) | Report

:) All right.
I will raise my permit on the asset and will reset the controller in order to change subnetmask from 255 to 252.

Thank you very much for your time. I will put my comment here after controller reset.

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Farid Rank: 1256

Answered 3 years ago

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Node 51 (AC800M) is not visible on Network RNRP list

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