Allen-Bradley MicroLogix 1100

Publication 1763-RM001C-EN-P - October 2009
Recipe and Data Logging 439
DLG - Data Log
Instruction
Instruction Type: output
The DLG instruction triggers the saving of a record. The DLG instruction
has one operand:
Queue Number - Specifies which data log queue captures a record.
The DLG instruction only captures data on a false-to-true rung transition.
The DLG rung must be reset (scanned false) before it will capture data
again. Never place the DLG instruction alone on a rung. It should always
have preceding logic, as shown below:
DLG
Data Log
queue number 0
DLG
Execution Time for the DLG Instruction
Controller When Rung Is:
True False
MicroLogix 1100 35.9 μs + 2.5 μs/data stamp +
1.9 μs/time stamp + 1.9 μs/
word logged + 4.3 μs/long
word logged
7.5 μs
IMPORTANT
You must configure a data log queue before
programming a DLG instruction into your ladder
program.
Data Log
queue number 0
DLG
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