Siemens SINUMERIK 840D sl Function Manual page 86

Several Operator Panels on Several NCUs, Distributed Systems (B3)
2.1 Brief Description
Possible faults
The NCU with which the connection is to be set up can reject the connection setup. Reason:
NCU faulty or the NCU cannot operate any additional control units at this time.
Machine data MD10134 $MN_MM_NUM_MMC_UNITS (number of possible simultaneous
HMI communications partners) contains the setting which defines how many control units
can be processed by an NCU at one time.
The OP030 uses one unit. A PCU, as supplied, uses two units. Other units (up to 12) are
required for larger OEM packages.
Alarms, messages
HMI Embedded, OP030
It is only possible to output the alarms of the NCU
to which a connection is currently active.
Alarm text management
HMI Embedded, OP030
Only one version of the alarm texts can be stored
on the operator component.
The standard alarm texts are stored once in the
same formulation for all NCUs.
The possible alarms for all connected NCUs must
be stored in the area for user alarms.
HMI connection check
The address of a connected NCU (only on the OPI bus) can be changed in the
"Connections/Service" menu. The new address of the NCU is stored on the NCU.
The softkey labeled "Service" is only displayed if the password for the "Service" protection
level has been entered. "
When the function for changing the address is started up, a direct connection between the
HMI and the relevant NCU must always be set up so as to ensure that the address is not
programmed more than once on the bus.
Note
When the NCU is replaced (service case) or if the backup battery fails, the stored address is
lost.
The address of the NCU is not lost after a general reset of the NCU.
The address can only be changed via the HMI software.
The display of the current connection in the basic display should be based on the
assignment of a unique channel name in machine data:
MD20000 $MC_CHAN_NAME (channel name)
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HMI Advanced
The alarms and messages of all connected NCUs
can be processed simultaneously.
HMI Advanced
NCU-specific user alarm texts cannot be created.
Function Manual, 01/2008, 6FC5397-1BP10-3BA0
Extended Functions