Siemens Automation System S7-400 - Manual (Page 49)

Installing the S7-400
2-33
Automation System S7-400 Hardware and Installation
A5E00850741-01
2.14 Marking the Modules with Slot Labels
Slot Number
Once the modules are installed, you should mark each one with its slot number to
avoid the risk of mixing up modules during operation. If modules do get mixed up,
you may have to reconfigure the assembly.
The slot number is printed on the rack.
Double-width modules occupy two slots and are assigned the consecutive slot
numbers of both slots.
Triple-width modules occupy three slots and are assigned the consecutive slot
numbers of these three slots.
Fitting Slot Labels
You use slot labels to mark a module with its slot number. The slot labels are
provided with the rack as a “number wheel”.
To attach the slot labels:
1. Hold the “number dial” on the module and rotate it to the slot number for the
module inserted at this slot.
2. Use your finger to press the slot label into the module. The label will break away
from the “number wheel”.
Figure 2-6 Fitting a Slot Label