Siemens SIMATIC MV550 S Operating Instructions Manual page 78

Connection
6.3 Connecting the power supply
NOTICE
Maximum torque for M12 knurled screws
Make sure to tighten the knurled screw of the M12 connector with ≃ 1 Nm to prevent
ingress of moisture.
Note
Power supply for SIMATIC MV500 via Power over Ethernet
Power can also be supplied to the optical readers via Power over Ethernet (PoE). You can
find information on PoE switches in the section "Power supply using Power over Ethernet
(PoE) (Page 76)".
NOTICE
Do not change the power supply during operation
Note that simultaneous or alternating operation (power supply) via the combination
interface and/or via the Ethernet interface (Power over Ethernet) is not guaranteed. If the
power supply is changed during operation, this can lead to malfunctions.
Note
Maximum CM cable length
You can connect a communication module to the optical reader with a max. cable length of
50 m.
In some situations, longer connecting cables up to 1000 m are possible. In this case,
consider the power consumption of the optical reader.
Avoid connecting more than two cable sections to create a long cable, because this
increases the cable resistance.
The reader is supplied with voltage via the combination interface or the Ethernet interface,
depending on your system configuration. Connect the reader to the power supply via the
appropriate interface using the appropriate cable. The following power supply options are
available:
● To an external power supply using the Power-IO RS232 cable over the combination
interface
● To a communication module using the communication module cable over the combination
interface
● To a PoE switch using the Industrial Ethernet connection cable via the Ethernet interface
When connecting to a communication module, power can also be supplied via an external
1)
power supply, however. This has the advantage that both the digital outputs and the trigger
can be used through the digital inputs.
78
1)
Operating Instructions, 05/2019, C79000-G8976-C494-02
SIMATIC MV500