Startup After Power Failure/Power Fail; Power-Up With Shutdown Signal - Siemens SINUMERIK 840Di sl Commissioning Manual

5.3.7

Startup after power failure/Power Fail

Case 1: SRAM saved
Thanks to the Power Fail Detection integrated in the PCU, in the event of a power failure the
SINUMERIK 840Di sl saves the user data in the SRAM of the MCI board. An SRAM image,
however, cannot be created any more in this case.
When the power returns or with the next power-up, the data is available again.
The SINUMERIK 840Di sl is thus ready again immediately.
NOTICE
Saving of the user data in the SRAM of the MCI board in case of power failure/Power Fail is
only guaranteed if the PCU is operated within its defined specifications.
References:
/BH/ Operator components Manual, Section "Component PCU 50"
Case 2: SRAM not backed-up
If the SINUMERIK 840Di sl was operated outside its defined specifications, it may not be
possible to save the user data in the SRAM. Proceed, therefore, as in section "Power-up
after changing the MCI board" (Page 132) Case 2 described.
5.3.8

Power-up with shutdown signal

If the SINUMERIK 840Di sl is operated with a UPS unit, the shutdown signal must be
configured accordingly. Refer to Section "Menu: Settings" (Page 490). If a shutdown signal is
pending, first the NC and PLC and then Windows XP are shut down correctly.
1. Power-up
If power-up is executed with a pending shutdown signal, Windows XP is immediately
correctly shut down again.
Manual
Commissioning Manual, 05/2008, 6FC5397–4CP10–4BA0
Power-On and Power-Up
5.3 Power-up
133