Siemens SCALANCE X-200 - Manual (Page 18)

Product Characteristics
4.1 SCALANCE X108
4.1.5 SCALANCE X108 Power Supply and Signaling Contact
Power Supply
The power supply is connected using a 4-pin plug-in terminal block. 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 X108 alone. The power supply is connected over a high resistance
with the enclosure to allow an ungrounded set up.
Figure 4-2 SCALANCE X108 Power Supply
Warning
The SCALANCE X108 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 W108 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 X108 to AC voltage or DC voltage higher than 32 V DC.
Signaling Contact
The signaling contact is connected to a 2-pin plug-in terminal block. The signaling contact is
a floating switch with which error/fault states can be signaled by breaking the contact.
The following errors/faults can be signaled by the signaling contact:
• The failure of a link at a monitored port.
• The failure of one of the two redundant power supplies.
The connection or disconnection of a communication node on an unmonitored port does not
lead to an error message.
The signaling contact remains activated until the error/fault is eliminated or until the current
status is applied as the new desired status using the button.
Industrial Ethernet SCALANCE X-100 and SCALANCE X-200 Product Line
4-4
Commissioning Manual, 1,