Allen-Bradley MicroLogix 1400 Instruction Manual page 522

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520 Recipe and Data Logging
Publication 1766-RM001A-EN-P - October 2008
Number of Records
Using Queue 0 as an example, each record consumes:
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
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 7281. The maximum number of records is calculated by:
Maximum Number of Records = Data Log File Size/Record Size
Example Queue 5
Queue 5 (Time = , Delimiter = TAB)
Time
Record 0 20:00:00
Record 1 20:30:00
Record 2 21:00:00
Record 3 21:30:00
Record 4 22:00:00
Record 5 22:30:00
Record 6 23:00:00
String Length of Record
The size of a record is limited so that the length of the maximum
formatted string does not exceed 109 characters. The following table can
be used to determine the formatted string length.
= 128K bytes/18 bytes
= (128)(1024)/18
= 7281 records
N7:11
TAB 2315 TAB 8190
TAB 2400 TAB 8210
TAB 2275 TAB 8150
TAB 2380 TAB 8195
TAB 2293 TAB 8390
TAB 2301 TAB 8400
TAB 2308 TAB 8100
I1:3.0 I1:2.1
TAB 4465
TAB 4375
TAB 4335
TAB 4360
TAB 4375
TAB 4405
TAB 4395