Installation guide

Elements of Network Planning
890 USE 100 00
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2.2.1 Modbus Plus Trunk Cable
Cable specified for Modbus Plus trunk use is available from Modicon as
the following part numbers:
Length of Cable on Reel Part Number
100 ft (30.5 m) 490NAA27101
500 ft (152.5 m) 490NAA27102
1000 ft (305 m) 490NAA27103
1500 ft (457 m) 490NAA27104
5000 ft (1525 m) 490NAA27106
Your cable will run directly between the network device locations. Each
cable segment must be a continuous run between the taps at two
locations. The use of splices, splitters, or any other configurations such
as star or tree configurations, is not allowed. The only allowed media
components are the network cable and taps.
You will typically plan your cable runs according to the horizontal
distances between sites. When you order trunk cable, you will be
ordering it by reels of fixed length. Order reels of sufficient length to
allow continuous runs between the network devices.
2.2.2 Modbus Plus Drop Cables
A drop cable is used at each site to connect between the tap and a
network node device. The cable is preassembled with a 9-pin D
connector on one end for connection to the node device. The other end
is open for connection to the tap. Cables are available in two lengths
with the following Modicon part numbers:
Length of Cable Part Number
8 ft (2.4 m) 990NAD21110
20 ft (6 m) 990NAD21130
You should plan to order a sufficient quantity of drop cables and taps to
allow extra ones for service access and spares.