242 Rockwell Automation Publication 2080-UM002N-EN-E - November 2022
Chapter 12 Using microSD Cards
Data Log Function (DLG) Block
The data logging function block lets a user program to write run-time global values into the
data logging file in microSD card.
DLG Input and Output Parameters
Parameter Parameter Type Data Type Description
Enable INPUT BOOL
Data logging write function enable.
On rising edge (that is, Enable value is triggered from low to
high), the function block executes. The precondition for
execution is that the last operation has completed.
TSEnable INPUT BOOL Date and timestamp logging enable flag.
CfgId INPUT USINT Configured dataset (DSET) number (1…10).
Status OUTPUT USINT Data logging function block current status.
ErrorID OUTPUT UDINT Error ID if DLG Write fails.
DLG Function Block Status
Status Code Description
0 Data logging IDLE status.
1 Data logging BUSY status.
2 Data logging COMPLETE SUCCEED status.
3 Data logging COMPLETE ERROR status.
DLG Function Block Errors
Status Code Name Description
0 DLG_ERR_NONE No error.
1 DLG_ERR_NO_SDCARD microSD card is missing.
2 DLG_ERR_RESERVED Reserved.
3 DLG_ERR_DATAFILE_ACCESS Error accessing data log file in microSD card.
4 DLG_ERR_CFG_ABSENT Data log configuration file is absent.
5 DLG_ERR_CFG_ID
Configuration ID is missing in data log configuration
file.
6 DLG_ERR_RESOURCE_BUSY
Same Configuration ID is used with other data log
function block call at the same time
7 DLG_ERR_CFG_FORMAT Data log configuration file format is wrong.
8 DLG_ERR_RTC Real time clock is invalid.
9 DLG_ERR_UNKNOWN Unspecified error has occurred.
IMPORTANT File access error will be returned during DLG function block execution
when card is full.
DLG
Enable
TSEnable
CfgId
Status
ErrorID
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