Siemens SINUMERIK 840D sl Function Manual page 208

Several Operator Panels on Several NCUs, Distributed Systems (B3)
2.15 Examples
Figure 2-38 MMC_1 online to NCU_1, MMC_1 wants to switch over to NCU_2, but does not receive permission from
PLC_2
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Function Manual, 01/2008, 6FC5397-1BP10-3BA0
Extended Functions