Attribute Semantics - Allen-Bradley 1444-TSCX02-02RB User Manual

Attribute Semantics

Transient Buffer Status
The status for the normal mode buffers occupy the first (lowest) 16 bits. The
highest 16 bits are reserved.
Bits 0...3 are for Buffer 0, through to bits 12...15 for Buffer 3.
Within each section, the following values/meaning have been allocated:
• 0x00 Buffer Free (available, ready for a transient event)
• 0x01 Data Ready Normal (transient completed normally, buffer
latched)
• 0x02 Data Latched Normal (transient completed normally, but could be
overwritten by a new event)
• 0x03 Transient in progress RPM (delta time acquisition in progress)
• 0x04 Transient in progress Time (delta time acquisition in progress)
• 0x05 Data Ready Aborted (speed crossed back over the same threshold,
but could be overwritten by a new event)
• 0x06 Data Latched Aborted (speed crossed back over the same
threshold, buffer latched)
• 0x07 Data Ready timeout (speed crossed one RPM threshold then
timed out, but could be overwritten by a new event)
• 0x08 Data Latched timeout (speed crossed one RPM threshold then
timeout, buffer latched)
• 0x0F Buffer not allocated/enabled
Example 0x****2222 indicates all four transient buffers that are latched with
data from transient events that completed normally.
In the case where the speed crossed back over the same threshold (an
incomplete transient event), a buffer that is configured as latching is still left
unlatched. This condition makes it available for a new event if the amount of
data that is stored is less than a fixed percentage of the buffer capacity. This
function helps to make sure that an aborted transient event with little data
available is automatically 'released' for potential capture of later events.
The percentage is not configurable, but is set at 20%. A completed transient
event (one that crosses both speed thresholds) always latches if so configured.
Timeout refers to the situation where one speed threshold is crossed and the
buffer is filled to maximum capacity before any further speed threshold
crossing occurs.
Rockwell Automation Publication 1444-UM001D-EN-P - June 2018
CIP Objects Appendix A
399