Siemens SCALANCE X-400 Operating Instructions Manual page 37

The modules in the individual slots have the following function (slot 1 is reserved
for a power supply unit):
● Slot 2
Power module
The input voltage of 24 V DC is transformed to the internal supply voltage. The
module has two 4-pin sockets for connecting a redundant power supply and for
connecting the signaling contact and protective earth.
● Slot 3
Digital input module
The input module has two 5-pin sockets for connecting eight digital inputs that
allow different signaling modes.
● Slot 4
CPU module
- Contains the processor that provides the management functionality.
- C-PLUG for storage of parameter assignment.
- DIL switch for the redundancy manager function and to specify the ring
ports.
- SELECT/SEL button for switching over the display modes, for resetting to
the factory default settings and to define the fault mask.
- LED display of the display modes DMode A through DMode D.
● Slot 5
Contains two RJ-45 jacks allowing attachment of electrical (twisted pair) con-
nections (10, 100, 1000 Mbps).
As an option, slot 5 allows the use of an optical gigabit module with two ports
(1000Base-SX or 1000Base-LX).
● Slots 6 and 7
Optional use of two optical fast Ethernet modules (100 Mbps) each with two
ports (100Base-FX).
● Slot 8
No function in system.
● Slot 9 through 11
Each contains four RJ-45 jacks allowing attachment of 12 electrical (twisted
pair) connections in total (10, 100 Mbps).
These cannot be used by media modules.
Operating Instructions for SCALANCE X-400 Industrial Ethernet Switches
C79000-G8976-C186-03
Product Description of SCALANCE X-400
37