Publication 1762-RM001C-EN-P
22-4 Data Logging (MicroLogix 1500 1764-LRP Processor only)
Number of Records
Using Queue 0 as an example, each record consumes:
In this example, each record consumes 18 bytes. So if one queue was
configured, the maximum number of records that could be stored would
be 2730. The maximum number of records is calculated by:
Maximum Number of Records = Data Log File Size/Record Size
= 48K bytes/18 bytes
= (48)(1024)/18
= 2730 records
Example Queue 5
String Length of Record
The size of a record is limited so that the length of the maximum
formatted string does not exceed 80 characters. The following table can
be used to determine the formatted string length.
Record Field Memory Consumption
Date 2 bytes
Time 2 bytes
N7:11 2 bytes
L14:0 4 bytes
T4:5.ACC 2 bytes
I1:3.0 2 bytes
B3:2 2 bytes
Integrity Check 2 bytes
Total 18 bytes
Table 22.2 Queue 5 (Time =
✔
✔✔
✔
, Delimiter = TAB)
Time N7:11 I1:3.0 I1:2.1
Record 0 20:00:00 TAB 2315 TAB 8190 TAB 4465
Record 1 20:30:00 TAB 2400 TAB 8210 TAB 4375
Record 2 21:00:00 TAB 2275 TAB 8150 TAB 4335
Record 3 21:30:00 TAB 2380 TAB 8195 TAB 4360
Record 4 22:00:00 TAB 2293 TAB 8390 TAB 4375
Record 5 22:30:00 TAB 2301 TAB 8400 TAB 4405
Record 6 23:00:00 TAB 2308 TAB 8100 TAB 4395
Data Memory Consumed Formatted String Size
delimiter 0 bytes 1 character
word 2 bytes 6 characters
long word 4 bytes 11 characters
date 2 bytes 10 characters
time 2 bytes 8 characters
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