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Siemens X-200 User Manual

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Product Characteristics 
 
4.3 SCALANCE X208PRO 
4.3.5 
SCALANCE X208PRO Power Supply and Signaling Contact 
Power Supply 
The power supply is connected over two 4-pin M12 connectors (a-coded). The power supply 
can be connected redundantly. Both inputs are isolated. There is no distribution of load. 
When a redundant power supply is used, the power supply unit with the higher output 
voltage supplies the SCALANCE X208PRO alone. The power supply is connected over a 
high resistance with the enclosure to allow an ungrounded set up.  
 
 
Figure 4-8 
SCALANCE X208PRO Power Supply 
 
 
Warning 
The SCALANCE X208PRO is designed for operation with safety extra-low voltage. This 
means that only safety extra-low voltages (SELV) complying with IEC950/EN60950/ 
VDE0805 can be connected to the power supply terminals. 
The power supply unit to supply the SCALANCE X208PRO must comply with NEC Class 2 
(voltage range 18 - 32 V, current requirement 350 mA) 
If the device is connected to a redundant power supply (two separate power supplies), both 
must meet these requirements. 
The signaling contact can be subjected to a maximum load of 100 mA (safety extra-low 
voltage (SELV), DC 24 V). 
Never connect the SCALANCE X208PRO to AC voltage or DC voltage higher than 32 V DC.
 
Signaling Contact 
The signaling contact is connected over one 5-pin M12 connector (b-coded). 
The signaling contact (relay contact) is a floating switch with which error/fault states can be 
signaled by breaking the contact.  
 
 
Figure 4-9 
SCALANCE X208PRO Signaling Contact 
 
Industrial Ethernet SCALANCE X-100 and SCALANCE X-200 Product Line 
4-20
 
Commissioning Manual, 1,