Siemens SINUMERIK 840D sl Function Manual page 83

Dynamic properties
The dynamic properties can be changed during runtime.
The states:
Online
Normal HMI operating mode with communication between PCU/HT6 and
NCU: Operation and/or monitoring possible.
Active
The operator can operate and
monitor.
Control unit switchover is enabled.
Operating the M:N function
The M:N function is operated via the "Channel menu" option.
The channel menu is selected using the "Channel switchover" softkey.
Use the horizontal softkeys to select a channel group (HMI Embedded/HT6: max. 8, HMI
Advanced: max. 24 channel groups). Up to eight connections to channels in different NCUs
can be set up in one channel group.
The "Channel menu" display shows all the current connections and the associated symbol
names.
Suppression strategy
If two PCUs/HT6s are online on one NCU, and a third PCU/HT6 would like to go online, then
the latter can "suppress" one of the other two. Communication is then interrupted between
this MMC and the NCU.
The algorithm responsible for this suppression is driven by priorities configured in the file
NETNAMES.INI.
Extended Functions
Function Manual, 01/2008, 6FC5397-1BP10-3BA0
Several Operator Panels on Several NCUs, Distributed Systems (B3)
Passive
Operator cannot operate. He sees a
window with header and alarm line
and a message indicating the
"passive" state.
Control unit switchover is disabled.
2.1 Brief Description
Offline
No communication
between PCU/HT6 and
NCU:
Operation and
monitoring not
possible.
83