Siemens SINUMERIK 840D sl Commissioning Manual page 956

Configuring the system
2.4 PCU with SITOP UPS module
Configuring the "EXIT" softkey
During production, the option to shut down the HMI via the "EXIT" softkey in the operating
area menu should be disabled, as this function cannot be synchronized with the UPS
module.
The "EXIT" softkey is disabled by entering ExitButton=False in the regie.ini file.
Hibernate
The operating system's hibernate mode is suspended when operating the UPS, as the USB
interface always has to be active for the UPS module.
Note
More information can be found in the product descriptions with the corresponding order
number.
62
Commissioning Manual, 02/2012, 6FC5397-1DP40-3BA0
PCU-Basesoftware (IM8)