SINUMERIK operating mode
6.2 Networking
ITC V3, ITC V3 PRO
138 Operating Instructions, 03/2024, A5E42761061-AF
Operating principle
If the TCU_SHIFT_LOCK bit is set for switchover disable, a user authorization request is not
carried out independently of the mode set on the HMI for allocation of user authorizations
(veto mode), i.e., a change of user authorization is rejected.
This message is displayed to the operator on all Panels for approximately 5 seconds:
"No switchover: Switchover disable set in current PLC."
While this message is displayed, operations on the Panel with the user authorization can still
be carried out unaffected.
Active switching of a Panel to another IPC is possible
The switchover disable only relates to changing the user authorization on the Panel in a
shadowing group on an IPC.
This means that active switching away from one Panel to another IPC is not prevented.
Special features
The following special cases should be noted:
• Even if switchover disable is set, the TCU_INDEX field value may change in the PLC. This is
the case under the following circumstances:
– If the Panel in possession of the user authorization is actively switched to another IPC.
Depending on whether another ITC takes over user authorization or no ITC is currently
active, like for user authorization switchover, the index of the ITC or the IPC itself is
entered if its directly connected Panel is active.
This can also be the value 255 if no TCU index is available for the Panel. Or 0 is entered
if a Panel is no longer available in the shadow group.
– If an m:n switchover is in progress. The HMI program of the incoming IPC deactivates
the HMI program which is active on it. A Panel from the shadow group of the new
(incoming) IPC must receive the user authorization. The TCU index of this Panel is
entered in the TCU_INDEX field.
– If an IPC is disconnected from an NCK/PLC in the context of m:n. No HMI program and,
therefore, no Panel with user authorization is then available on the exited NCK/PLC.
This is signaled independently of a switchover disable by entering the value 0 into the
TCU_INDEX field.
• If an ITC is actively switched over to another IPC it can be deactivated there, i.e. it does not
obtain user authorization if a switchover disable is set for the destination IPC.
• With an m:n switchover of the IPC – the IPC is switched to another NCK and, therefore, to
another PLC – the IPC accepts the switchover disable settings of that PLC.
• The m:n interlock options on the PLC side have priority over the ITC switchover disable, so
that a set ITC switchover disable cannot prevent an m:n switchover. If necessary, the m:n
influencing options should be synchronized here with those for the ITC in the PLC. It may,
for example, be practical to set or remove the m:n displacement disable simultaneously
with the ITC switchover disable.
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