Siemens X-400 ユーザーズマニュアル

Operating Instructions for SCALANCE X-400 Industrial Ethernet Switches 
C79000-G8976-C186-03 

119

 

 

 

 

Connecting end devices or network 
segments over twisted pair 

2 x RJ-45 jack (10/100/1000 Mbps) 
12 x RJ-45 jack (10/100 Mbps) 
All electrical ports support autonegotia-
tion and autocrossover. 

 

Installation of media modules 

2 x slot (6 and 7) for media module 
types MM491-2 and MM491-2LD 
1 x slot (5) for media module types 
MM492-2 and MM492-2LD 

 

Installation of extender modules 

1 x slot for extender module 
EM495-8 or EM496-4 

 

Connector for power supply and signal-
ing contact 

2 x 4-pin plug-in terminal blocks 

 

Connection of digital inputs 

2 x 5-pin plug-in terminal blocks 

 Power 

supply 

(redundant inputs isolated) 

2 power supplies 24 V DC (20.4 to 
28.8 V) safety extra-low voltage 
(SELV) 
Power supply voltage connected over 
high resistance with housing (not elec-
trically isolated). 
Tested to IEC 6100-4-5, 1995 "Surge 
Immunity Test“, performed with light-
ning protection device DEHN Blitzduc-
tor VT AD 24V, article no. 918 402 is 
used 

 

Power consumption (without modules) 
at 24 V DC 

15 W 

 

Current consumption at 24 V DC 

< 2000 mA