Data Log Status File - Allen-Bradley MicroLogix 1400 Instruction Manual

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526 Recipe and Data Logging

Data Log Status File

Publication 1766-RM001A-EN-P - October 2008
There is a Data Log Status (DLS) file element for each Data Log Queue.
The DLS file does not exist until a data log queue has been configured.
The Data Log Status file has 3-word elements. Word 0 is addressable by
bit only through ladder logic. Words 1 and 2 are addressable by word
and/or bit through ladder logic.
The number of DLS file elements depends upon the number of queues
specified in the application. The status bits and words are described
below.
Data Log Status (DLS) File Elements
Control Element
Word 15 14 13 12
0 EN 0 DN OV
(1) (2) (3)
1 FSZ = File Size (number of records allocated)
2 RST = Records Stored (number of records recorded)
(1) EN = Enable Bit
(2) DN = Done Bit
(3) OV = Overflow Bit
(4) CQ = ClearQueue bit
Data Logging Enable (EN)
When the DLG instruction rung is true, the Data Logging Enable (EN) is
set (1) and the DLG instruction records the defined data set. To address
this bit in ladder logic, use the format: DLS0:Q/EN, where Q is the queue
number.
Data Logging Done (DN)
The Data Logging Done (DN) bit is used to indicate when the associated
queue is full. This bit is set (1) by the DLG instruction when the queue
becomes full. This bit is cleared when a record is retrieved from the
queue. To address this bit in ladder logic, use the format: DLS0:Q/DN,
were Q is the queue number.
11 10 09 08 0 0
7 6
CQ 0 0 0 0 0
(4)
0 0 0 0 0 0
5 4 3 2 1 0
0 0 0 0 0 0