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Using the Integration Capabilities of the VPO Motif-based GUI
Event Integration Through Messages
Chapter 3 105
Message Generation Policies and Message Filtering
Threshold monitoring enables you to choose either a minimum or
maximum threshold:
❏ Maximum threshold monitoring
As long as the values received from the monitored object are less than
the threshold value, no messages are generated. If the values reach or
exceed the threshold value, then VPO generates the configured
message for this object.
❏ Minimum threshold monitoring
As long as the actual values received from the monitored object are
above the threshold value, no messages are generated. If they reach
or drop below the threshold value, then VPO generates the configured
message for this object. The generation of further messages depends
on how the message generation type is configured, see below.
To prevent redundant messages from cluttering the operators’ Message
Browsers, VPO provides three mechanisms you can use to generate
further messages after the value of a monitored object crosses a defined
threshold:
❏ Message generation on crossing threshold with Reset
If the monitored value reaches or crosses the threshold, VPO
generates one message. Before VPO generates further messages, the
monitored value must either:
• Drop below the reset value for maximum threshold monitoring, or
• Rise above the reset value for minimum threshold monitoring.
❏ Message generation on crossing threshold without Reset
If the monitored value reaches or crosses the threshold, VPO
generates one message. Before VPO generates further messages, the
monitored value must either:
• Drop below the threshold value for maximum threshold
monitoring, or
• Rise above the threshold value for minimum threshold
monitoring.