Siemens SINUMERIK 840D sl Function Manual page 893

DB19
DBX 126.4
Data Block
Edge evaluation: No
Signal state 1 or
edge change
0 → 1
Signal state 0 or
edge change
1 → 0
DB19
DBX126.5
Data Block
Edge evaluation: No
Signal state 1 or
edge change
0 → 1
Signal state 0 or
edge change
1 → 0
2. HMI/PLC online interface
The signals of the 2nd HMI/PLC online interface are analogous in meaning to the signals of
the 1st HMI/PLC online interface (MMC2_ ... replaces MMC1_...)..
Sign-of-life monitoring HMI
After a control unit has gone online to an NCU, the HMI sign of life is set in the interface.
(E_BTSSReady, E_MMCMPI_Ready, E_MMC2Ready)
The signals are automatically set by the HMI when the control unit goes online and stay set
for as long as it remains online.
They are provided separately for each HMI/PLC interface and used by the PLC to monitor the
HMI sign of life.
First HMI/PLC online interface
A distinction between an control unit link via the OPI (1.5 Mbaud) or the MPI (187.5 kbaud) is
made on this interface.
The signal corresponding to the bus type is set while the control unit is online.
DB10 DBX104.0
FALSE
TRUE
DB10 DBX104.1
Extended Functions
Function Manual, 10/2015, 6FC5397-1BP40-5BA3
MMC1_ACTIVE_CHANGED
Active/passive operating mode of HMI
Signal(s) updated: Cyclic
HMI to PLC:
Control unit has completed changeover from passive to active mode
HMI to PLC:
Control unit has completed changeover from active to passive mode
MMC1_CHANGE_DENIED
Operating mode changeover rejected
Signal(s) updated: Cyclic
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.
HMI to PLC or PLC to HMI depending on status of interface:
Acknowledgement on MMC1_CHANGE_DENIED (FALSE → TRUE)
MCP1 ready
MCP1 is not ready
MCP1 is ready
MCP2 ready
Z2: NC/PLC interface signals
19.2 Distributed systems (B3)
893