FALCON USER GUIDE
EN2Z-0962GE51 R0715 216
Trend Buffer Settings
Here you can define the trend buffer settings and clear the buffer.
Under Entries in Buffer, the current number of records is displayed.
Under Buffer Size, the max. buffer size can be set (trend logging must be
disabled).
NOTE: The internal flash memory (2 MB) is capable of storing a maximum
of 64,000 trend records distributed among a max. of 125 trend log
objects (all LON properties are saved within one trend log object).
Each trend record allocates 30 bytes of memory. Based upon the
internal flash storage selection, the default value for the max. buffer
size is 2880 records, distributed among 24 trend log objects
according to the calculation:
2 MB / 30 / 2880 = 24
Based on the preceding calculation, external flash cards with
capacities higher than 2 MB enable you to extend the no. of
trend log objects and trend records to be saved.
IMPORTANT
Irrespective of the buffer size (step h) and the storage mode selected
(internal or external flash, step j), it is recommended not to increase
the default buffer size. Increasing the value above 2880 results in
decreased performance when viewing and browsing trend record
pages and creates additional effort when manually downloading trend
records into a csv. file on the PC (step 7).
The maximum no. of storable trend records per download is 1550
independent of the no. of trend log objects selected. To reduce the no.
of manual downloads necessary for the total download of trend records
exceeding the max. no. of 1550, the date range can be set accordingly
(step 6).
x. Enter buffer size.
y. Select buffer type under Buffer Type:
• Ringbuffer
The oldest record will be overwritten by the latest record when the buffer
size is exceeded.
• Stop when full
Trending is stopped when the buffer size is exceeded.
z. Select storage location under Storage (trend logging must be disabled):
• Compact Flash
The trend results are saved on the "external" flash card. The compact flash
is portable and allows trending of additional trend log objects with more trend
records.
• Internal Flash
The trend results are saved on the internal flash memory.
See previous Buffer Size Note.
aa. To clear the buffer, click the CLEAR BUFFER button.
10. To save settings, click the SUBMIT button.
View BACnet Diagnostic Data
Procedure 1. In the tree, expand the Advanced item, the System Settings item and then the
Diagnostics item.
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