Siemens SINUMERIK 840D sl Function Manual page 127

B3: Several operator panels connected to several NCUs, distributed systems - only 840D sl
If the default settings in FB101 are not changed, the alarms start at
DB2.DBX188.0 (1st alarm) and end at
DB2.DBX188.(6th alarm)
With variable:
DBX_Byte_alarm, the byte value for the 6 alarms can be changed from the default setting of
188. With variable:
DBX_Byte_report, the byte value of the operational message can be changed from the
default setting of 192.
Mixed mode
Definition:
The term "mixed mode" refers to a state in which a conventional OP without control unit
switchover function is connected to the first HMI interface on the NCU. The control unit
switchover then operates exclusively on the 2nd HMI interface.
Parameter "MMC_mixed_mode" (variable in FB101/DB101) can be set to switch the
operating mode from pure HMI operation to mixed mode by entering the following settings.
When FB101 is called, this must be assigned:
TRUE Mixed mode is effective. Control unit switchover operates on the 2nd interface
FALSE Mixed mode is not effective. Control unit switchover operates on both interfaces
Supplementary conditions:
● A machine control panel (MCP) must not be configured for the first HMI interface. The
● To allow the second HMI interface to be assigned active mode status, it is possible to
Server mode
Once a server has occupied the HMI interface of an NCU, it cannot be suppressed by any
other device.
Extended Functions
Function Manual, 09/2009, 6FC5397-1BP20-0BA0
2.2 Several operator panel fronts and NCUs with control unit management option
first HMI interface is always assigned active mode status in mixed operation.
assign active mode status to both online interfaces in mixed operation. However, certain
supplementary conditions apply.
WARNING
When data are input from both control units simultaneously, there is a risk that
inconsistent data will be transferred to the control.
127