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Rockwell Automation Publication 1444-UM001D-EN-P - June 2018 239
Trend and Transient Capture Chapter 9
Concluding a Transient Event
A start-up transient concludes when the referenced speed crosses above the
high-speed threshold. If during the startup, the speed falls below the low
threshold, then the transient is suspended, so the sampling stops.
A coast down transient concludes when the referenced speed falls below the
low speed threshold. If during the coast down the speed crosses above the high
threshold, then the transient is suspended, so the sampling stops.
If the sampling stops due to a suspended startup or coast down, then the data
from the event is retained anyway if at least 20% of the discrete data records
was collected. If less than 20% of the data was collected, then the event data is
discarded.
Latching
If latch capability is enabled, then a buffer latches once it has been filled, so has
no remaining empty records. A latched buffer is not available for update until it
is reset.
In the event a transient event occurs when no buffers are available, the data
manager functions as if a buffer was available and triggers samples and
monitors status. However, no data is stored.
Reset a transient buffer latch by any of the following:
• Controller Output: The TransientBufferReset bit (bits 10…13) of the
controller output assembly control tag, where x is the number of the
buffer (0…3)
• Dynamix transient data manager object service
• Uploading the transient Buffer
The data manager automatically resets a buffer after it has been uploaded to a
host.