Glossary - Siemens S7-1500 Function Manual

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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.

Structure and Use of the CPU Memory

Function Manual, 10/2018, A5E03461664-AC

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