General Notes On Data Backup - Siemens SINUMERIK 840C Installation Instructions Manual

01.99

11.1.2 General notes on data backup

Loss of data occurs in case of
• hardware defect on the module
• hard disk defect
• backup battery failure (loss of SRAM data)
• withdrawal of modules CSB, NC CPU, MMC CPU
• EMC influence
Data range
Hardware overview
NCK
DRAM not buffered
NCK data
SRAM buffered
NCK data
Note:
The CSB battery is used for SRAM data buffering.
© Siemens AG 1992 All Rights Reserved
SINUMERIK 840C (IA)
Drive 611D
PLC
DRAM not buffered
SRAM buffered
PLC user program
Drive machine data
memory
PLC memory
PLC system data DRAM not buffered
6FC5197- AA50
11 Data Backup/CPU Replacement
11.1.2 General notes on data backup
MMC
SRAM
clock
TEA2
PLC machine data
Hard disk
MMC data
WOP data
NCK data
PLC user program
611D configuration
and MD
Boot file 611D
11–3