Siemens SINUMERIK 840Di Manual page 400

10 NC Start-Up with HMI Advanced
10.10 NC/PLC diagnosis (840Di SW 2.3 and higher)
10-400
S
512KB SRAM
This selection option assigns the 1 MB physical SRAM SRAM of the
MCI boards to the NCK for storing retentive data. Approx. 512KB, de-
pending on the configuration of the NCK (number of channels, number of
axes, etc.) are available to the user as user memory.
S
2560KB RAM / HD non–volatile
This selection option assigns 3MB of virtual SRAM (see Subsection
10.4.3, Page 10-300) to the NCK for storing retentive data. Approx.
2560KB, depending on the configuration of the NCK (number of chan-
nels, number of axes, etc.) are available to the user as user memory.
Notice
On loss of voltage or if the PCU is deactivated without terminating Window NT
correctly, all user data are lost. A UPS system (see Subsection 1.1.8, Page
1-29) is therefore absolutely necessary in conjunction with the virtual SRAM.
S
Signal input for Shutdown behavior: Signal source
Use the list box to configure the digital input used for the shutdown signal of
the UPS:
S
deactivated
No input signal present
S
NCK inputs 0...3
The shutdown signal of the UPS is connected to the digital input of the
MCI board extension module (see Subsection 2.4.3, Page 2-66).
S
Signal input for shutdown behavior: Signal level
Use the list boc to configure the level of the shutdown signal of the UPS:
S
Low active
On detection of the low level (0) at the configured input,
SINUMERIK 840Di NCK / PLC and then Windows NT are terminated
S
High active
On detection of the high level (1) at the configured input,
SINUMERIK 840Di NCK / PLC and then Windows NT are terminated.
 Siemens AG, 2003. All rights reserved
SINUMERIK 840Di Manual (HBI) – 06.03 Edition
06.03