Siemens SIMATIC ET 200SP - Retentive Memory NVRAM

Functions
8.2 Retentive memory NVRAM
CPU 1515SP PC (F)
60 Manual, 05/2017, A5E32701806-AC
Temperature monitoring
Three thermistors monitor the temperature at multiple locations of the CPU 1515SP PC (F):
● 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, the temperature
monitoring triggers a temperature error. The temperature error activates the IPC DiagBase
and/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. Up to 410 KB of data is backed up to non-volatile data memeory by this in
the event of power failure. This function can be set on the engineering station in the TIA
Portal.