S908 Bus Lengths
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By Geoff Nash, submitted on January 29th, 2010
This application note describes S908 Remote IO bus length limitations when using the PLC IO Interface for Modicon S908 Remote IO.
The following information is from the S908 remote IO planning documentation; refer to this for a more detailed discussion. The S908 bus length is dependent on the type of coaxial cable that is used. There are three types of cable, each has a maximum length. The length specified below includes the trunk and drop cables, drop cables may be up to 100 feet from the trunk.
|
Cable type
|
Maximum Cable Length
|
dB loss/1000 ft
|
|
RG-6/U
|
5000
|
7.0
|
|
RG-11/U
|
8000
|
2.0
|
|
CATV
|
15000
|
0.8
|
The maximum dB loss between PIO and any drop is 35 db. Taps and splitters have an effect:
|
Cable type
|
dB loss on trunk
|
dB loss on drop
|
|
Tap
|
1
|
14
|
|
Splitter
|
6
|
|
The RIO cable must be terminated with a 75 Ohm terminator.
Actual maximum cable length may be extended using a fiber optic repeaters.
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