Siemens SIMATIC NET System Manual page 130

SCALANCE network components
4.3 Common properties of all SCALANCE devices
Avoiding loops
The typical configuration of a network with SCALANCE products is a tree structure. The
direct connection of two ports on the switch or accidental connection over several switches
causes an illegal loop. Such a loop can lead to network overload and network failures.
The loop detection function detects network loops at the ports monitored by it. Loop
Detection is solely an analysis function; detected errors must be eliminated with other
measures. Network loops can, for example, be eliminated by changing the topology or by
switching off ports.
Cable length at the electrical ports
A maximum of two IE-TP cords or IE-TP-XP cords with a total length of max. 10 m can be
used between two adjacent SCALANCE devices with IE TP ports.
With the IE FC cables and IE FC RJ-45 plug, an overall cable length of a maximum of 100 m
is permitted between two devices depending on the cable type.
Table 4- 1
Cabling structure
In one piece
(without IE TP cords)
Structured
(with IE-TP cords and
IE FC outlet RJ-45 or IE
FC RJ-45 modular
outlet)
Notes on installation
When installing the devices note the information in the operating instructions of the particular
device. Apart from a few exceptions, the devices are suitable for wall mounting, DIN rail
mounting and S7 standard rail mounting. In individual cases the required type of mounting
can be made possible by using a mounted adapter.
130
Maximum section length with twisted-pair cables
Cable type
IE FC standard cable GP
IE FC flexible cable GP
IE FC torsion cable GP
IE FC trailing cable GP
IE FC trailing cable
IE FC marine cable
IE FC FRNC cable GP
IE FC food cable
IE FC festoon cable GP
IE FC standard cable GP
IE FC flexible cable GP
IE FC torsion cable GP
IE FC trailing cable GP
IE FC trailing cable
IE FC marine cable
IE FC FRNC cable GP
IE FC food cable
IE FC festoon cable GP
Max. length Max. total of the patch
cables (TP cord)
100 m
85 m
55 m
85 m
85 m
85 m
85 m
85 m
85 m
90 m
75 m
45 m
75 m
75 m
75 m
75 m
75 m
75 m
System Manual, 09/2019, C79000-G8976-C242-10
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10 m
Industrial Ethernet