Glossary - Siemens S7-1500 Function Manual
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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Glossary
Backup CPU
When the R/H system is in RUN-Redundant system state, the Primary CPU controls the
process. The Backup CPU synchronously executes the user program and can take over the
process control at a failure of the Primary CPU.
Bit memory
Bit memory is a component of the system memory of the CPU for saving intermediate
results. You access the bit memory from the user program in bit, byte, word or double-word
mode.
Code block
In SIMATIC S7, a code block contains a portion of the STEP 7 user program.
Consistent data
Consistent data is data whose content belongs together. Consistent data is read and written
contiguously.
Counter
Counters are components of the system memory of the CPU. You can modify the content of
the "counter cells" using STEP 7 instructions. Example: Count up or down.
Data block
Data blocks (DBs) are data areas in the user program that contain user data. The following
data blocks are available:
● Global data blocks that you access from all code blocks.
● Instance data blocks that are assigned to a particular FB call.
Data log
Data logs are CSV files for the saving of tag values. The data logs are stored on the
SIMATIC memory card in the "\datalogs" directory. Instructions in the user program write
data records of tag values to a data log.
74
Structure and Use of the CPU Memory
Function Manual, 10/2018, A5E03461664-AC
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