Siemens SINUMERIK 840D sl Function Manual page 1018

NC/PLC interface signals (Z2)
19.2 Several Operator Panels on Several NCUs, Distributed Systems
Bit signals
DB19
DBX 126.0
Data Block
Edge evaluation: No
Signal state 1 or
edge change
0 → 1
Signal state 0 or
edge change
1 → 0
DB19
DBX 126.1
Data Block
Edge evaluation: No
Signal state 1 or
edge change
0 → 1
Signal state 0 or
edge change
1 → 0
DB19
DBX 126.2
Data Block
Edge evaluation: No
Signal state 1 or
edge change
0 → 1
Signal state 0 or
edge change
1 → 0
DB19
DBX 126.3
Data Block
Edge evaluation: No
Signal state 1 or
edge change
0 → 1
1018
MMC1_SHIFT_LOCK
Disable/enable control unit switchover
Signal(s) updated: Cyclic
Control unit switchover or change in operating focus is disabled.
The current control unit-NCU constellation remains unchanged.
Control unit switchover or change in operating focus is enabled
MMC1_MSTT_SHIFT_LOCK
Disable/enable MCP switchover
Signal(s) updated: Cyclic
MCP switchover is disabled.
The current MCP-NCU constellation remains unchanged.
MCP switchover is enabled
MMC1_ACTIVE_REQ
Control unit 1 requests active operating mode
Signal(s) updated: Cyclic
HMI to PLC: passive control unit 1 requests active operating mode
PLC to HMI: Request received
MMC1_ACTIVE_PERM
Active/passive operating mode
Signal(s) updated: Cyclic
PLC to HMI:
passive operator unit 1 can change to active operating mode
Function Manual, 01/2008, 6FC5397-1BP10-3BA0
Extended Functions