Siemens S7-1500 Function Manual page 79
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
Restart
A restart (warm restart) deletes all non-retentive bit memory and resets non-retentive DB
contents to the start values from the load memory. Retentive bit memory and retentive DB
contents are retained. Program execution begins at the call of the first startup OB.
Retentivity
A memory area whose content is retained after power failure and after a transition from
STOP to RUN is retentive. The non-retentive bit memory area, timers and counters are reset
after power failure and after a STOP to RUN transition.
SIMATIC memory card
Memory for the user program for programmable modules and communications processors.
You can also use the SIMATIC memory card for exchange of user software and user data.
Standard access
Data blocks with standard access have a fixed structure. In the declaration, the data
elements contain both a symbolic name and a fixed address within the block. The address is
displayed in the "Offset" column.
In these data blocks, you can address tags both symbolically and absolutely:
"Data".FillState
DB1.DBW2
System states
The redundant S7-1500R/H system has various system states. The system states result
from the operating states of the Primary and Backup CPUs. The concept of the system state
is used to obtain a simplified expression that characterizes the simultaneously occurring
operating states of the two CPUs. The following system states are available for the
redundant system S7-1500R/H: STOP, STARTUP, RUN-Solo, SYNCUP and RUN-
Redundant.
Timer
Timers are components of the system memory of the CPU. The operating system
automatically updates the content of the "timer cells" asynchronously to the user program.
STEP 7 instructions specify the precise function of the timer cell (e.g. on delay) and trigger
its execution.
78
Structure and Use of the CPU Memory
Function Manual, 10/2018, A5E03461664-AC
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