Siemens SINUMERIK 840D sl Function Manual page 216

B3: Several operator panels connected to several NCUs, distributed systems - only 840D sl
2.15 Examples
Figure 2-39 MMC_1 online to NCU_1, MMC_1 switches over to NCU_2 (no suppression)
Extended Functions
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Function Manual, 09/2009, 6FC5397-1BP20-0BA0