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Chapter 9
Trend and Transient Capture
234
Alarm Buffer
The alarm buffer consists of a copy of the trend buffer's 640 discrete and 64
dynamic records that are sampled at their user-specified rates. Also, there is a
second "high resolution" 320 record discrete buffer that is sampled at a fixed
100 millisecond update rate.
For each of the data sets, the low and high-resolution discrete buffers and the
dynamic data buffer, provide independent definition of how much of the
buffer to capture post trigger. This capability lets any portion of the 640, 320
and 64 record buffers be updated after the trigger.
Triggering the Alarm Buffer
The alarm buffer "triggers" on an event that can be any of:
• Voted Alarm
Voted Alarm is the 'normal' method. You can select any unique alarm
and the alarm status: alert, danger, or fault. See
page
222.
• Any Voted Alarm
When defined, this triggers alarm buffer capture when any voted alarm
actuates, regardless of the status, such as alert, danger, or fault.
• Controller Output Tag
Regardless of the trigger on selection, the alarm buffer always triggers
when the AlarmBufferTrigger, bit 8 of the control tag, in the controller
output assembly is set.
• Service Request
Regardless of the trigger on selection, the alarm buffer always triggers
upon receipt of the Dynamix™ data manager object alarm buffer trigger
service.
Rockwell Automation Publication 1444-UM001D-EN-P - June 2018
Voted Alarms Page on
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