Publication 1762-RM001C-EN-P
22-10 Data Logging (MicroLogix 1500 1764-LRP Processor only)
File Size (FSZ)
File Size (FSZ) shows the number of records that are allocated for this
queue. The number of records is set when the data log queue is
configured. FSZ can be used with RST to determine how full the queue is.
To address this word in ladder logic, use the format: DLS0:Q.FSZ, where
Q is the queue number.
Records Stored (RST)
Records Stored (RST) specifies how many data sets are in the queue. RST
is decremented when a record is read from a communications device. To
address this word in ladder logic, use the format: DLS0:Q.RST, where Q is
the queue number.
DLS information can be used in the following types of instructions:
NOTE
If a queue is full and another record is saved, the oldest
record is over-written. Queue behavior is the same as a
FIFO stack—first in, first out. If a queue is full and an
additional record is saved, the “first” record is deleted.
Instruction Type Operand
Relay (Bit) Destination Output Bit
Compare Source A
Source B
Low Limit (LIM instruction)
Test (LIM instruction)
High Limit (LIM instruction)
Source (MEQ instruction)
Mask (MEQ instruction)
Compare (MEQ instruction)
Math Source A
Source B
Input (SCP instruction)
Logical Source A
Source B
Move Source
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