Siemens SINUMERIK 840D sl Function Manual page 212

Several Operator Panels on Several NCUs, Distributed Systems (B3)
Examples
Note for the reader
The arrangement of the signals of a block in box PLC_x (marked as B) corresponds to the
arrangement of signal names in the header section (marked as A). Blocks B repeat in box
PLC_x from top to bottom as a function of time.
Figure 2-34
212
MMC_1 requests active mode, MMC_2 is in active mode, can change to passive mode
Function Manual, 03/2009, 6FC5397-1BP10-4BA0
Extended Functions