Chapter 6 N:n Network; System Configuration; Wiring; Selection Of Cable - Mitsubishi Electric LE7-40GU Instruction Manual

6
N:N NETWORK
LE7-40GU can be operated as a local station for FX PLC N:N network communication.
Data monitoring and parameter writing from a master station FX PLC for up to seven local stations (LE7-40GU units) can be
carried out.
Precautions
• For 5 seconds after turning on the power of LE7-40GU, data from master station will not be accepted.
• Initial setting of LE7-40GU can not be done only with N:N Network.
• Simultaneous use of N:N Network and CC-Link communication is not possible.
6.1

System Configuration

N:N Network master station
(FX series PLC)
Connection equipment Communication
form
FX5 PLC (master station) RS-485
6.2

Wiring

This section describes wiring.

Selection of cable

Use the following procedure to select cables.
Twisted pair cable
Use a shield twisted pair wire for connection with RS-485 communication equipment.
■RS-485 cable specification
Item
Cable type
Pairs
Conductor resistance (20)
Insulation resistance
Withstand voltage
Capacitance (1 kHz)
Characteristic impedance (100 kHz)
Connection Cable
Connection cable Tension controller
(Local station)
Cable type name Optional equipment
 (Built-in to main unit)
User created
Specifications
Shielded cable
2 p, 3 p
88.0 /km or less
10000 M-km or more
500 V DC1 minute
An average of 60 nF/km or less
11010 
LE7-40GU
Connectable
No. of units
Main unit
LE7-40GU Up to seven local stations (LE7-
40GU) from the master station
6 N:N NETWORK
6.1 System Configuration
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