Siemens SINUMERIK 840D sl Manual page 53

If all the TCUs are active, the new one cannot be a replacement. The system will then
automatically switch to the name assignment phase after a set period of time has elapsed.
Figure 1-18
Replacing a device
If "Replacement" is selected, all the registered TCUs will appear in a selection menu. Those
which are active in the network will be grayed out. (As these are functioning, there should be
no question of replacing them.) The cursor automatically defaults to the first row for selection.
As the accessibility test is still running in the background, the active status of the rows may
change if panels are switched on or off.
If a name is ultimately chosen, it will be applied to the new TCU along with the associated
saved settings.
Operator panel front: OP 012
Manual, 09/2016, A5E36371591B
TCU menu: Name of TCU
General information and networking
1.4 Networking
53