Program Instructions That Control Data Logs - Siemens S7-1200 System Manual
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- Operating instructions manual (132 pages) ,
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- Manual (46 pages)
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Extended instructions
8.7 Recipes and Data logs
8.7.2.2
Program instructions that control data logs
DataLogCreate (Create data log) instruction
Table 8- 158 DataLogCreate instruction
LAD/FBD
In the SCL example, "DataLogCreate_DB" is the name of the instance DB.
1
Table 8- 159 Data types for the parameters
Parameter and type
REQ
IN
RECORDS
IN
FORMAT
IN
TIMESTAMP
IN
382
SCL
"DataLogCreate_DB"(
req:=_bool_in_,
records:=_udint_in_,
format:=_uint_in_,
timestamp:=_uint_in_,
done=>_bool_out_,
busy=>_bool_out_,
error=>_bool_out_,
status=>_word_out_,
name:=_string_inout_,
ID:=_dword_inout_,
header:=_variant_inout_,
data:=_variant_inout_);
Data type
Bool
UDint
UInt
UInt
Description
Creates and initializes a data log file. The file is
created in the PLC \DataLogs directory, named
by the NAME parameter, and implicitly opened
for write operations. You can use the Data log
instructions to programmatically store run-time
process data in flash memory of the CPU.
STEP 7 automatically creates the associated
instance DB when you insert the instruction.
Description
A low to high (positive edge) signal starts the operation.
(Default value: False)
The maximum number of data records the circular data
log can contain before overwriting the oldest entry:
The header record is not included. Sufficient available
PLC load memory must exist in order to successfully
create the data log. (Default value - 1)
Data log format:
0 - Internal format (not supported)
•
1 - Comma separated values "csv-eng" (Default
•
value)
Data time stamp format: Column headers for date and
time fields are not required. The time stamp uses the
system time (Coordinated Universal Time - UTC) and not
the local time.
0 - No time stamp
•
1 - Date and time stamp (Default value)
•
System Manual, 03/2014, A5E02486680-AG
S7-1200 Programmable controller
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