SI-EtherCAT User Guide
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Issue Number: 2
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Electrical installation
4.1
SI-EtherCAT module information
4.1.1
Bus media
The SI-EtherCAT option module incorporates two 100 BASE-TX RJ45 interfaces.
4.1.2
Cabling considerations
To ensure long-term reliability it is recommended that any cables used to connect a system
together be tested using a suitable Ethernet cable tester, this is of particular importance when
cables are constructed on site.
4.1.3
Cable
Cables should be shielded and as a minimum, meet TIA Cat 5e requirements.
4.1.4
Maximum network length
The main restriction imposed on Ethernet cabling is the length of a single segment of cable. The SI-
EtherCAT module has two 100BASE-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-EtherCAT
port and another 100BASE-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, fiber optic,
etc.).
Cabling issues are the single biggest cause of network downtime. Ensure cabling is
correctly routed, wiring is correct, connectors are correctly installed and any switches or
routers used are rated for industrial use. Office grade Ethernet equipment does not
generally offer the same degree of noise immunity as equipment intended for industrial
use.
The EtherCAT system designer must consider the impact that the selected network
structure will have on performance.
NOTE
NOTE
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