Rockwell Automation T7832 ICS Regent+Plus Historian Packages for Winterpret - Manual (Page 40)

Historian Package for W INTERPRET (T7832)
4 0
Industrial Control Services
detected, an event is recorded in the events buffer for the
entry.
3. No further processing occurs during the scan.
Start Contact Is Off
If the start contact was on during the previous scan, The
“Start Contact” event is added to the event buffer. No further
processing occurs during the scan
Clear Contact Is On
If the clear contact was on during the previous scan, no
further processing occurs.
If the clear contact has switched from off to on, the following
occurs:
1. The count is set to zero.
2. All events are deleted from the events buffer.
3. The “Clear Contact” event is added to the events buffer.
4. No further processing occurs during the scan.
Buffer Usage
The sequence of events are stored in a circular buffer in the
Regent, the size of which is determined by the user. As events
are stored in the buffer, the Count register reports the amount
of space in use. Therefore, to determine the amount of space
available in the buffer, subtract the value in the Count
register from the constant in the Size field.
Once the buffer is full, new events will begin to overwrite the
oldest events in the buffer. The Count register value will
remain at its maximum value (Size - 3) as this occurs. Only
when the Clear contact is energized will the Count value be
reset to zero.
Execution Speed
The execution speed of a sequence of events function block can
be measured in three modes:
1. Function block is in the run mode, but no events have
occurred.
2. Events are being recorded.