Siemens 020-011 Benutzerhandbuch
Industry Sector, IA&DT
SCE Training Curriculum
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SCE_EN _020-011_R1404_Startup Programming with SIMATIC S7-1500
Retentive memory
The retentive memory is a non-volatile memory for saving certain data if there is a power failure. The
variables and operand areas that are defined as retentive are saved in the retentive memory. This data
is retained beyond a switch-off or a power failure.
All other program tags are set to their start values in the case of operating mode transitions POWER ON
after startup, and at STOP after startup.
The retentive memory content is cleared through the following actions:
● General reset
● Rest to factory settings
variables and operand areas that are defined as retentive are saved in the retentive memory. This data
is retained beyond a switch-off or a power failure.
All other program tags are set to their start values in the case of operating mode transitions POWER ON
after startup, and at STOP after startup.
The retentive memory content is cleared through the following actions:
● General reset
● Rest to factory settings
Note:
Certain tags of technology objects are also stored in the retentive memory. These are not deleted when
a general reset is performed.
a general reset is performed.