Siemens SINUMERIK 840D sl Commissioning Manual page 976

Backing up and restoring data
4.2 Operating the service PC or the PG on the network
Configuration with PG/PC directly to PCU
Figure 4-7
Configuration with PG/PC and switch to PCU
Figure 4-8
Note
If a PCU is switched off and on again without its own OP/TP including TCU, and if the PCU
boot-up is supposed to take place from the service system (EBS), an external VGA monitor
and keyboard are needed in order to operate the PCU.
An external VGA monitor and keyboard are not needed if the TCUs are operating and the
PCU is not switched off with the EBS during booting.
82
Connecting a PG directly to a PCU
Connecting a PG via a switch to a PCU
Commissioning Manual, 02/2012, 6FC5397-1DP40-3BA0
PCU-Basesoftware (IM8)