Siemens SCALANCE X-200 - Manual (Page 34)

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,