Retentive Memory Areas - Siemens S7-1500 Function Manual

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Memory areas and retentive memory

2.3 Retentive memory areas

2.3
Retentive memory areas
Introduction
The CPUs have a memory for storing retentive data at POWER OFF. You can find the size
of the retentive memory in the technical specifications of the respective CPU.
You can find the utilization of the retentive memory of the configured CPU in STEP 7 offline
under "Program info > Resources" or online under Online & diagnostics with "Diagnostics >
Memory".
If you define data as retentive, its content is retained for the startup of a program after STOP
or a power failure.
You can define the following data and objects as retentive:
● Tags of global data blocks
● Tags of instance data blocks of a function block
● Bit memories, timers and counters
Tags of technology objects are retentive, e.g. calibration values of absolute encoders. STEP
7 manages the retentivity of the technology object tags automatically. Hence, you do not
have to configure retentivity.
The retentive tags of technology objects are unaffected by a memory reset. You can delete
these retentive tags only by a reset to factory settings.
26
Structure and Use of the CPU Memory
Function Manual, 10/2018, A5E03461664-AC

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