Memory Configuration - Siemens SINUMERIK 840D sl Commissioning Manual

10.3

Memory configuration

Introduction
On the SINUMERIK 840D sl, the persistent data are divided into various independent areas:
● SIEMENS
● Vendor
● Users
SRAM
For historical reasons, SRAM is still named as the memory medium at various points in
relation to persistent data. For SINUMERIK solution line, this only applies insofar as SRAM
is also sometimes used in the context of persistent data management. However, when a
SINUMERIK solution line control system is in continuous operation, the data are physically
stored in the much more powerful DRAM. Only when the control system is switched off are
the data saved to a persistent data storage area. SRAM is also used for specific control
systems.
Memory division
The figure below shows how NCK persistent data is divided:
Figure 10-3
IBN CNC: NCK, PLC, drive
Commissioning Manual, 07/2007, 6FC5397-2AP10-3BA0
Memory division
NCK start-up
10.3 Memory configuration
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