Publication 1766-RM001A-EN-P - October 2008
518 Recipe and Data Logging
Data Logging
Data Logging allows you to capture (store) application data as a record for
retrieval at a later time. Each record is stored in a user-configured queue
in battery backed memory (B-Ram). Records are retrieved from the
MicroLogix 1400 processor via communications. This chapter explains
how Data Logging is configured and used.
This section contains the following topics:
• Queues and Records on page 518
• Configuring Data Log Queues on page 523
• DLG - Data Log Instruction on page 525
• Data Log Status File on page 526
• Retrieving (Reading) Records on page 528
Queues and Records
The MicroLogix 1400 processor has 128K bytes (128 x 1024) of additional
memory for data logging purposes. Within this memory, you can define
up to 256 (0…255) data logging queues. Each queue is configurable by
size (maximum number of records stored), and by length (each record is
1…109 characters). The length and the maximum number of records
determine how much memory is used by the queue. You can choose to
have one large queue or multiple small queues.
The memory used for data logging is independent of the rest of the
processor memory and cannot be accessed by the User Program. Each
record is stored as the instruction is executed and is non-volatile
(battery-backed) to prevent loss during power-down.
Data Files Function FilesProgram Files
1
2
0
3
4 to 255
STI
EII
HSC
PTOX
PWMX
RTC
3
4
2
5
6 to 255
Q1
Q2
Q0
Q3
Q4 to 255
Specialty Files
efesotomasyon.com - Allen Bradley,Rockwell,plc,servo,drive
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