Siemens S7-1500 Function Manual page 56
Automation system
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Also See for S7-1500:
- System manual (523 pages) ,
- Function manual (402 pages) ,
- Manual (188 pages)
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Data type
String
Time
Tod
UDInt
UInt
USInt
WChar
Word
Number of data records in a data log
The RECORDS parameter of the "DataLogCreate" instruction specifies the maximum
number of data records that can be stored in a data log.
Time stamp bytes in a data record
● No time stamp = 0 bytes
● Time stamp = 22 bytes
Structure and Use of the CPU Memory
Function Manual, 10/2018, A5E03461664-AC
Bytes
Example 1: MyString String[10]
The maximum character string size is specified with 10 characters.
Text character + automatic filling with spaces = 10 bytes
•
Quotation marks at the start and end + comma character = 3 bytes
•
10 + 3 = 13 bytes total
Example 2: Mystring2 String
If no size is specified in square brackets, 254 bytes are assigned by default.
Text character + automatic filling with spaces = 254 bytes
•
Quotation marks at the start and end + comma character = 3 bytes
•
254 + 3 = 257 bytes total
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12
7
5
1
6
Memory usage and application examples
3.2 Memory usage for data logging
55
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