Dead PU410 doesn't toggle redundancy switchover

The system is 800xA V6.0.3 with two pairs of redundant advant connectivity servers. In case of particular power failure the PU410 (with only one power supply) is dead but the connectivity server is still running. The server doesn't notice that the PU410 is down and therefore no redundancy switchover take place. It there a configuration needed? Does anyone has a workaround?

Thank you in advance!

Erik

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erik

Rank: 31

Asked 10 days ago

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Answers

There are watchdogs between the host and PU410 box. When the PU410 is lost, the related services like OPC DA Connector, Event Collector, TTD Data Server, etc. should abort/restart (which forces clients to failover to another service provider) and remain in abnormal state (e.g. Synchronizing).

If that is not the case, you should file a support case with your regional ABB support center to obtain assistance.

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Stefan Stromqvist AKS expert

Rank: 1

Answered 10 days ago

Hi Erik

I guess that your observation is correct, i.e. the connectivity server still running does not recognize that it has lost connectivity due to power failure on the connected PU410.

But in a redundant connectivity server setup, the other connectivity server maintains connectivity provided that the connected PU410 is still running.

On the other hand, an inappropriate consequence might be that 800xA Clients, fetching OPC Data from the connectivity server that has lost connectivity due to power failure on the connected PU410, will loose OPC Data to Graphic Displays PG2 (remember that the connectivity server is still running and the 800xA Service Provider with respect to OPC Data is still OK, but connectivity has been lost due to power failure on the connected PU410 and 800xA Clients does not automatically switch over to the connectivity server with OPC Data available). Please correct me if I am wrong in this observation.

To my knowledge there is no possible configuration that will prevent / circumvent the above described situation.

A workaround is the following:

I will recommend that you ensure redundant power to the PU410.

This can be achieved with e.g. one "APC Automatic Transfer Switch" which has two inputs 220 VAC (Power A and Power B) and one output 220 VAC for the PU410.

I hope that the above might help you.

BR Carsten

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