SI-Ethernet User Guide
15
Issue: 3
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4.4
Cable shield connections
Standard Ethernet UTP or STP cables do not require supplementary grounding.
4.5
Cable
It is recommended that a minimum specification of CAT5e is installed on new installations, as this
gives a good cost/performance ratio. If you are using existing cabling, this may limit the maximum
data rate depending on the cable ratings. In noisy environments, the use of STP or fiber optic cable
will offer additional noise immunity.
4.6
Maximum network length
The main restriction imposed on Ethernet cabling is the length of a single segment of cable as
detailed in Table 4-1. If distances greater than this are required it may be possible to extend the
network with additional switches or by using a fiber optic converter.
4.7
Network topology
The SI-Ethernet option module and onboard Ethernet interface support multiple network topologies
this allows the user to design a robust network using the topology that works best for the chosen
design.
Star topology:
•
Enables individual devices to be swapped out
•
Minimise message transmission delays
Line topology (daisy chain):
•
Simple wiring
•
Lowest cost
Tree topology:
•
Maximises bandwidth - contains messages within appropriate segments
•
Products can be connected in functional groups, e.g. to enable one section of a machine to be
turned off
Cabling issues are the single biggest cause of network down-time. 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.
Table 4-1 Ethernet maximum network lengths
Type Of Cable
Data rate (bit/s)
Maximum trunk length (m)
Copper - UTP/STP CAT 5
100 M
100
Fiber Optic - Multi-mode
3000
Fiber Optic - Single-mode
up to 100000
The distances specified are absolute recommended maximums for reliable transmission
of data. The distances for the fiber optic sections will be dependent on the equipment
used on the network. The use of wireless networking products is not recommended for
control systems, as performance may be affected by many external influences.
NOTE
NOTE
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