Siemens SINUMERIK 840D sl Function Manual page 219

B3: Several operator panels connected to several NCUs, distributed systems - only 840D sl
Figure 2-42
Figure 2-43
Extended Functions
Function Manual, 09/2009, 6FC5397-1BP20-0BA0
MMC_1 server, wishes to switch operating focus from NCU_1 to NCU_2, switchover
disabled in PLC_1
MMC_1 is server, wishes to switch operating focus from NCU_1 over to NCU_2,
switchover is disabled in PLC_2
2.15 Examples
219