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A data log file is created with a pre-determined fixed sized based on the RECORDS and
DATA parameters. The data records are organized as a circular log file. New records are
appended to the data log file, until the maximum number of records that is specified by the
RECORDS parameter is stored. The next record written will overwrite the oldest record.
Another record write operation will overwrite the next oldest data record and so on.
Note
If you want to prevent overwriting any data records, then you can use the DataLogNewFile
instruction to create a new data log based on the current data log, after the current data log
has stored the maximum number of records. New data records are stored in the new data
log file. The old data log file and record data remain in flash memory. Memory resource usage:
● The data logs consume only load memory.
● There is no set limit for the total number of data logs. The size of all data logs combined
is limited by the available resources of load memory. Only eight data logs may be open at
one time.
● The maximum possible number for the RECORDS parameter is the limit for an UDint
number (4,294,967,295). The actual limit for the RECORD parameter depends on the
size of a single record, the size of other data logs, and the available resources of load
memory. In addition, Excel limits the number of rows allowed in an Excel sheet.
Note
A DataLogCreate operation extends over many program scan cycles. The actual time
required for the log file creation depends on the record structure and number of records.
Your program logic must monitor and catch the DataLogCreate DONE bit's transition to
the TRUE state, before the new data log can be used for other data log operations. No error
0 7000 Call with no REQ edge: BUSY = 0, DONE = 0
0 7001 First call with REQ edge (working): BUSY = 1, DONE = 0
0 7002 Nth call (working): BUSY = 1, DONE = 0
1 8070 All internal instance memory is in use.
1 807F Internal error
1 8090 Invalid file name
1 8091 Name parameter is not a String reference.
1 8093 Data log already exists.
1 8097 Requested file length exceeds file system maximum.
1 80B3 Insufficient load memory available.
1 80B4 MC (Memory Cartridge) is write protected.
1 80C1 Too many open files: No more than eight opened data log files are allowed.
1 8253 Invalid record count
1 8353 Invalid format selection
1 8453 Invalid timestamp selection
1 8B24 Invalid HEADER area assignment: For example, pointing to local memory
1 8B51 Invalid HEADER parameter data type
1 8B52 Too many HEADER parameter data elements
1 8C24 Invalid DATA area assignment: For example, pointing to local memory
1 8C51 Invalid DATA parameter data type
1 8C52 Too many DATA parameter data elements Opens a pre-existing data log file. A data log must be
opened before you can write new records to the log. Data
logs can be opened and closed individually. A maximum
of eight data logs can be open at the same time.
STEP 7 automatically creates the associated instance DB
when you insert the instruction.
A low to high (positive edge) signal starts the operation. (Default value:
False)
MODE IN UInt Operation mode:
 0 - Append to existing data (Default value)
 1 - Clear all existing records
NAME IN Variant Name of an existing data log: This variant only supports a String data type
and can only be located in local, DB, or M memory. (Default value: ' ')
ID In/Out DWord Numeric identifier of a data log. (Default value: 0)
Note: Symbolic name access for this parameter is not allowed.
DONE OUT Bool The DONE bit is TRUE for one scan, after the last request was completed
with no error. (Default value: False)
BUSY OUT Bool  0 - No operation in progress
 1 - Operation on progress