Connection
6.2 Power supply using Power over Ethernet (PoE)
SIMATIC MV500
76 Operating Instructions, 06/2018, C79000-G8976-C494-01
Only connect safety extra-low voltage (SELV) according to IEC 62368-1
Operation with safety extra-low voltage
The device is designed for operation with safety extralow voltage (SELV). This means that
only safety extra-low voltages (SELV) according to IEC 62368-1 can be connected to the
power supply terminals.
The power unit for supplying the device must comply with NEC Class 2 as described by the
National Electrical Code(r) (ANSI/NFPA 70).
The power of all connected power supply units must total the equivalent of a power source
with limited power (LPS limited power source).
Power supply using Power over Ethernet (PoE)
"Power over Ethernet" (PoE) is a power supply technology for network components
complying with IEEE for 802.3af.
● The power is supplied over the Ethernet cables used to connect the individual network
components with one another. This makes an additional power cable unnecessary.
● SIMATIC MV500 is a PD (Powered Device), Type 1, Class 3 (max. 12.95 W)
Restriction of the power supply type
The IEEE standard 802.3af specifies two types of power supplies:
● Voltage via wire pairs that are not used for data transmission (redundant wires).
● Voltage via wire pairs that are used for data transmission (phantom power).
The Ethernet connection of the SIMATIC MV500 optical readers is four-wire. Power can only
be suppled via these four wires with phantom power. The voltage feeding device must
provide the phantom power.
The following Siemens switches with PoE provide phantom power:
● SCALANCE X108 POE
● SCALANCE XP208 POE EEC
● SCALANCE XP216 POE EEC
● SCALANCE X308-2M POE
● SCALANCE XR324-4M POE
● SCALANCE XR324-4M POE TS
● SCALANCE XM-400 with Port Extender PE408 PoE and
PoE power supply SCALANCE PS9230 PoE or SCALANCE PS924 PoE
● SCALANCE XR-500M with media module MM992-4POE or MM992-4POEC
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