Siemens SIMATIC ET 200AL System Manual page 1886

Operating states
Operating states describe the behavior of a single CPU at a specific time.
The CPUs of the SIMATIC standard systems feature the STOP, STARTUP and RUN operating
states.
The primary CPU of the S7-1500R/H redundant system has the operating states STOP,
STARTUP, RUN, RUN-Syncup and RUN-Redundant. The backup CPU has the operating states
STOP, SYNCUP and RUN-Redundant.
Organization block
Organization blocks (OBs) form the interface between the CPU operating system and the user
program. The order in which the user program is executed is defined in the organization
blocks.
Parameter
1. Tag of a STEP 7 code block:
2. Tag used to set one or several characteristics of a module
In delivery state, every module has practical basic settings, which can be modified by
configuration in STEP 7.
There are static and dynamic parameters
PG
→ Programming device
PLC
→ Programmable logic controller
Primary AR
The primary AR is the system redundancy AR between an IO device with system redundancy
S2 and the primary CPU of the redundant S7-1500R/H system.
Primary CPU
If at least one R/H CPU is in RUN state, the primary CPU is the controlling CPU. The primary
CPU controls the process (productive data).
The user program is executed identically in the primary CPU and the backup CPU.
PROFINET with STEP 7
Function Manual, 05/2021, A5E03444486-AL
Glossary
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