
①
Rack:
Contains slots for the CPU modules and communications
modules.
Contains terminal points.
②
CPU modules:
Can be installed individually or as a redundant pair. CPUs
are plugged into the rack.
③
Communications modules:
Optional modules with additional functions. These can al‐
so be installed individually or as a redundant pair. Com‐
munications modules are plugged into the rack.
3.3
Basic components of the system
3.3.1
Rack with 4 slots
Definition
The core component of the SIMATIC CN 4100 communication system is the rack.
The four-slot rack provides the following:
• Two slots for CPU modules.
– Redundant operation: Two CPUs.
– Simple operation: A CPU in the first slot.
• Two slots for communications modules.
• Power supply connections
• Network connections
Design of the front panel
The following figure shows the front panel of the rack:
System overview
3.3 Basic components of the system
CN 4100 Communication System
12
Equipment Manual, 10/2021, A5E50871363-AA