SI-PROFINET RT User Guide
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Issue Number: 2
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4.4
Maximum network length
The main restriction imposed on Ethernet cabling is the length of a single segment of
cable. The SI-PROFINET RT module has two 100 BASE-TX Ethernet ports, which
support segment lengths of up to 100 m. This means that the maximum cable length
which can be used between one SI-PROFINET RT port and another 100 BASE-TX port
is 100 m, however it is not recommended that the full 100 m cable length is used.
The total network length is not restricted by the Ethernet standard, but depends on the
number of devices on the network and the transmission media (copper, fibre optic, etc).
4.5
SI-PROFINET RT terminal descriptions
The SI-PROFINET RT module has two RJ45 Ethernet ports for connection to a
PROFINET network. Each Ethernet port operates in full duplex mode as a network
switch and has an LED associated with it to indicate the connection status as shown in
Table 4-2.
Table 4-2 LED functionality
Figure 4-2 SI-PROFINET RT connections
NOTE
State
Meaning
OFF
No Ethernet network connection detected
Steady green
Ethernet connection established
Flashing green
Ethernet message frame detected
Ethertnet
Port A
Ethertnet
Port B
Ground
tab
Link LEDs
