The NVRAM memory contains:
oFiles saved for the diagnostics
oRemanent (retain-persistent) variables
The following table describes the size of the NVRAM:
|
User Function |
Description |
Size |
|---|---|---|
|
System diagnostics |
Contain the controller context saved on power off. |
128 Kbytes |
|
Remanent (retain-persistent) variables |
Modified and saved in the NVRAM. Saved after each modification. This action impacts the cycle time. |
Retain: 64 Kbytes Persistent: 64 Kbytes |
Remanent or retain-persistent variables are saved in the NVRAM. Each subsequent read/write access to these variables requires a NVRAM access. For more information about remanent variables, see Remanent Variables. For more information about the impact on performance, see Processing Performance.
NOTE: For an optimum cycle time, only access the retain-persistent variables when necessary. For frequent (Read) access, copy theses variables to a working memory in the RAM.
