13
Wiring Section 2-2
• Press the cable connector in firmly until it locks into place at both the
switching hub and the ED Router.
• Do not lay the twisted-pair cable together with high-voltage lines.
• Do not lay the twisted-pair cable near devices that generate noise.
• Do not lay the twisted-pair cable in locations subject to high temperatures
or high humidity.
• Do not lay the twisted-pair cable in locations subject to excessive dirt and
dust or to oil mist or other contaminants.
Switching Hub Installation
Environment Precautions
• Do not ground the switching hub in the same location as a drive-system
component such as an inverter.
• Always use a dedicated power supply for the switching hub’s power sup-
ply. Do not use the same power supply used for other equipment, such as
an I/O power supply, motor power supply, or control power supply.
• Before installation, check the switching hub’s environment-resistance
specifications, and use a switching hub appropriate for the ambient condi-
tions. Contact the switching hub manufacturer for details on switching
hub’s environment-resistance specifications.
Switching Hub
Connection Methods
• Connect two hubs to each other as follows: Connect an MDI port to an
MDI-X port with a straight cable; connect two MDI ports with a cross
cable; and connect two MDI-X ports with a cross cable.
Note It is very difficult to distinguish cross cables and straight cables by
appearance. Incorrect cables will cause communications to fail. We
recommend using cascade connections with straight cables when-
ever possible.
• Some switching hubs can automatically distinguish between MDI and
MDI-X. When this kind of switching hub is being used, straight cable can
be used between switching hubs.
STP
(Shield)
STP
(Shield)
Connect shield.
Do not connect shield.
FG
terminal
ED Router
Connector
FG
terminal
ED Router
Connector
Hub Hub
GR GR
STP
(Shield)
Connector Connector Connector Connector Connector
MDI-X port
(cross)
Switching
Hub
Switching
Hub
Switching
Hub
: Straight cable
: Cross cable
Switching
Hub
MDI ports
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