[Alarm]IsolationDetectIP1

In a system that has redundant pairs of alarm servers, this parameter needs to be set to the IPAddress of a local piece of infrastructure (e.g. a router) on the network that can be pinged by the alarm server. This will be used by the alarm server to detect if it has become completely isolated from the network due to an outage. Setting this parameter will improve outcomes for alarm server redundancy as described below.

When a redundant pair of alarm servers are unable to connect to each other, both take on the primary responsibility for collecting and archiving alarm data. An alarm server taking on this responsibility is called the 'Main' alarm server. When the connection between the servers is reestablished, the alarm servers communicate with each other and decide which server will remain as 'Main', and which server will be 'Standby'.

Consider the situation whereby the alarm servers could not communicate to each other as one of the servers was completely isolated from the network. Being completely isolated from the network, the server would not have obtained any new alarm data during the outage. Whereas the peer alarm server may have still been obtaining data from the field during this time period. To insure all the data that was captured during the outage is maintained by the alarm system, the alarm server that was not isolated needs to stay 'Main' when the connection is recovered. Configuring this parameter correctly as described above will insure that the correct decision is made, as the alarm servers will know if they have been isolated from the network during the outage.

Depending on your network topology, each alarm server in a redundant pair may require a different setting for this parameter, as they may have different infrastructure nearby their location in the network.

Note: This parameter can also be applied to a specific cluster or alarm server process. For more information, see Configure Alarm Parameters for a Specific Cluster or Process.

Allowable Values:

• Machine name

• IP address

  • If the Plant SCADA system is using an IPv4 network, use a standard IPv4 address format. For example, 192.1.2.34

  • If the Plant SCADA system is using an IPv6 network, use a standard IPv6 address format (or any acceptable abbreviation). For example, 2001:0db8:0000:0000:0000:8a2e:0123:1234 or 2001:db8::8a2e:123:1234 (abbreviated).

Default Value:

None

See Also

[Alarm]IsolationDetectInterval

[Alarm]IsolationDetectRetryCount

Alarm Parameters