Siemens SINUMERIK Series Function Manual page 855

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
FALSE
TRUE
DB10 DBX104.2
FALSE
TRUE
DB10 DBX108.3
FALSE
TRUE
DB10 DBX108.2
FALSE
TRUE
Extended Functions
Function Manual, 03/2013, 6FC5397-1BP40-3BA1
MCP1 ready
MCP1 is not ready
MCP1 is ready
MCP2 ready
MCP2 is not ready
MCP2 is ready
HHU ready
HHU is not ready
HHU is ready
E_MMCBTSSReady
No control unit online to OPI
Control unit online to OPI
E_MMCMPIReady
No control unit online to MPI
Control unit online to MPI
Z2: NC/PLC interface signals
18.2 Distributed systems (B3)
855