Retentive Memory Nvram - Siemens simatic ET 200SP User Manual

Temperature monitoring
Three temperature sensors monitor the temperature at different locations of the
CPU 1515SP PC:
● Processor temperature
● Temperature in the vicinity of the RAM ICs/blocks
● Temperature of the basic module
If one of the temperature values exceeds the set temperature threshold, a temperature error
is triggered which activates the IPC DiagBase or IPC DiagMonitor software.
The temperature error remains stored until the temperatures fall below the temperature
threshold again and it is reset using one of the following measures:
● Acknowledgment of the error message by the monitoring software
● Restart of the device
8.2

Retentive memory NVRAM

Retentive memory is non-volatile memory for saving a limited quantity of data in the event of
power failure.
The data defined as retentive is stored in retentive memory. This data is retained beyond a
power-off or power failure.
A corresponding function is implemented in the S7-1500 software controller to allow NVRAM
to be used there. This saves up to 183.5 KB of data in non-volatile data memory in the case
of power failure. This function can be set on the engineering station in the TIA Portal.
CPU 1515SP PC
Manual, 12/2014, A5E32701806-AA
Functions
8.2 Retentive memory NVRAM
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