SMP Gateway User Manual • 187
19.2.2 SMP Manager’s Redundancy Column
The Redundancy column shows the current state of each SMP Gateway within a redundancy
group. In the previous section’s example, the second SMP Gateway is on hot standby. This
happens if the data points of the devices connected to the SMP Gateways have been configured for
hot standby (for details, see “Hot Standby”, page 191). There can be several intermediate states,
suc
h as “initial”, “listen” or “speak”, while the grouping takes place. Thereafter, the following
states may be displayed:
Active.
Indicates that this SMP Gateway is active. It communicates with the field devices and sends
“keep alive” messages at a frequency set through parameter settings. In the event of a failover,
it becomes the standby SMP Gateway.
Standby.
Indicates that this SMP Gateway is on standby. It listens for “keep alive” messages from the
active SMP Gateway and takes over as the active SMP Gateway if the latter fails to send a
message within the expected number of milliseconds.
Hot Standby.
Indicates that this SMP Gateway is on hot standby. It listens for “keep alive” messages from
the active SMP Gateway. It also synchronizes all the data points that have been set up for hot
standby in SMP Config. See “Hot Standby”, page 191, for more information about this
part
icular redundancy feature.
Partial Hot Standby.
Indicates that this SMP Gateway is on hot standby (see above), but that the SMP Gateways
have different configuration files.
When nothing is displayed, SMP Manager is not able to communicate with the SMP Gateway for
one of the following reasons:
The SMP Gateway’s redundancy software is not running because you have not set its
redundancy parameters.
The redundancy software has not been installed correctly on the SMP Gateway.
The SMP Gateway is down.
This column may also advise you of exceptional situations, as described here:
Peer IP: nnn.nnn.nnn.nnn.
Indicates that one SMP Gateway of the group is not present in the SMP Gateway list of
SMP Manager. To fix the problem, simply add the second gateway to the list.
Too Many SMPs.
There are more than 2 SMP Gateways in this redundancy group. To fix the problem, remove
the excess SMP Gateways.
Different parameters.
The 2 SMP Gateways in this group do not have the same redundancy settings.
To fix the problem, take the following steps:
Click one or both SMP Gateways.
From the Redundancy menu, click Group Properties.
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