Properties Of The User Memory - Siemens SIMOTION C Operating Instructions Manual

Commissioning
7.5 User memory concept
7.5.2

Properties of the user memory

Non-volatile data (NVRAM)
Non-volatile data is used with the objective of retaining user- and system-relevant data when
the SIMOTION C is de-energized. You will find information about the area that can be used
for non-volatile data in the SIMOTION SCOUT Configuration Manual.
The following non-volatile data is available in a SIMOTION C:
Table 7- 2
Non-volatile data
Kernel data
Retain variables
Retain TO
The non-volatile data of a SIMOTION C has the following properties:
Table 7- 3
Property
Location
Backup time
Note
IP and DP parameters in non-volatile data
If there is a configuration on the MMC, the IP and DP parameters are loaded from the MMC
during ramp-up, written to the non-volatile data and used by the SIMOTION C. The
SIMOTION C uses the addresses defined in these parameters to go online. The IP and DP
parameters in the non-volatile data are retained and used by the SIMOTION C if a ramp-up
is performed with an MMC that does not contain a configuration.
A SIMOTION C can therefore always go online if a configuration has been loaded at least
once with the SIMOTION SCOUT, or if the SIMOTION C has been ramped up once with an
MMC.
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Content of non-volatile data
Content
Last operating state

IP parameters (IP address, subnet mask, router address)

DP parameters (DP addresses, baud rate)

Diagnostic buffer

Variables in the interface or implementation section of a UNIT

declared with VAR_GLOBAL RETAIN
Global device variables set with the "RETAIN" attribute

Absolute encoder offset

Properties of non-volatile data
Meaning
In the NVRAM of the SIMOTION C, no back-up battery required
Unlimited
SIMOTION C
Operating Instructions, 02/2012