234 Rockwell Automation Publication 2080-UM002M-EN-E - April 2022
Chapter 11 Using microSD Cards
Data Log Performance
(1) BOOL, DATE, TIME data variables are presented in decimal digital format in the microSD Card. You have the option to convert
this format to a more friendly format. For example, use ANY_TO_STRING function block to convert BOOL data type (0, 1) to
FALSE or TRUE. You can similarly do the same for DATE and TIME data types.
DATE data type is presented in differential decimal digital value between system baseline time (1970/01/01,00:00:00) and
current date value. Unit is millisecond.
Time should be absolute time value. Unit is second.
(2) String data variables are enclosed in double quotation marks in the data log file.
The example below shows DSET1 using string variables and DSET2 using integers.
Data Log – Data Payload vs. Performance Time
Parameter
Number of Characters
28 502 518 1028 1493 3676
Average write time per data log
file including all overheads
541.75 ms 1043.75 ms 1086.67 ms 1632.36 ms 1972.9 ms 2696.22 ms
Average write time excluding first
sample
500.40 ms 963.86 ms 999.14 ms 1472.37 ms 1818.33 ms 2545.92 ms
Average write time excluding all
overheads
479.10 ms 493.03 ms 502.78 ms 505.54 ms 519.91 ms 715.68 ms
Time (msec)
Data Payload
2750
2250
1750
1250
750
250
0
500
1000
1500
2000
2500
3000
3500
4000
715.68
519.9090909
505.5405405
493.0344828
502.7840909
479.10
541.75
963.858859
999.1414141
1043.75
1086.67
1472.367347
1632.36
1818.326531
1972.9
2545.918367
2692.22
Average write time per
data log including all
overheads
Average write time
excluding first sample
Average write time
excluding all overheads
500.40
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