Siemens SINUMERIK Series

Z2: NC/PLC interface signals
18.2 Distributed systems (B3)
Extended Functions
854 Function Manual, 03/2013, 6FC5397-1BP40-3BA1
DB19
DBX 126.3
Data Block
MMC1_ACTIVE_PERM
Active/passive operating mode
Edge evaluation: No Signal(s) updated: Cyclic
Signal state 1 or
edge change
0 → 1
PLC to HMI:
passive operator unit 1 can change to active operating mode
Signal state 0 or
edge change
1 → 0
PLC to HMI:
active operator panel must change to passive operating mode
DB19
DBX 126.4
Data Block
MMC1_ACTIVE_CHANGED
Active/passive operating mode of HMI
Edge evaluation: No Signal(s) updated: Cyclic
Signal state 1 or
edge change
0 → 1
HMI to PLC:
Control unit has completed changeover from passive to active mode
Signal state 0 or
edge change
1 → 0
HMI to PLC:
Control unit has completed changeover from active to passive mode
DB19
DBX126.5
Data Block
MMC1_CHANGE_DENIED
Operating mode changeover rejected
Edge evaluation: No Signal(s) updated: Cyclic
Signal state 1 or
edge change
0 → 1
HMI to PLC or PLC to HMI depending on status of interface:
Operating mode cannot be changed due to uninterruptible processes on active control unit.
Signal state 0 or
edge change
1 → 0
HMI to PLC or PLC to HMI depending on status of interface:
Acknowledgement on MMC1_CHANGE_DENIED (FALSE → TRUE)