
112
7 MODBUS/RTU, ASCII (SLAVE)
7.1 System Configuration
7
MODBUS/RTU, ASCII (SLAVE)
LE7-40GU can be operated as a slave station for MODBUS/RTU and ASCII communication.
Data monitoring and parameter writing from a master station for up to 247 slave 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 by MODBUS communication.
• Simultaneous use of MODBUS communication and CC-Link communication is not possible.
7.1
System Configuration
*1 The shortest specification on the MODBUS/RTU master device side takes precedence.
7.2
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
Connection equipment
Communication
form
Connection cable
Tension controller
(Slave station)
Number of
connectable
devices
Cable type name
Longest
distance
Optional equipment
Main unit
MODBUS/RTU, ASCII
master device
RS-485
User created
1200 m
(Built-in to main unit)
LE7-40GU
Up to 247 slave
stations (LE7-40GU)
from the master station
Item
Specifications
Cable type
Shielded cable
Pairs
2 p, 3 p
Conductor resistance (20
)
88.0
/km or less
Insulation resistance
10000 M
-km or more
Withstand voltage
500 V DC 1 minute
Capacitance (1 kHz)
An average of 60 nF/km or less
Characteristic impedance (100 kHz)
110
10
MODBUS/RTU, ASCII master station
(FX series PLC)
Connection Cable
LE7-40GU
Содержание LE7-40GU
Страница 1: ...LE7 40GU INSTRUCTION MANUAL Communication ...
Страница 2: ......
Страница 10: ...8 TRADEMARKS 150 ...
Страница 11: ...9 CONTENTS ...
Страница 37: ...3 CC LINK IE FIELD NETWORK BASIC COMMUNICATION 3 3 Reference Program 35 3 ...
Страница 38: ...36 3 CC LINK IE FIELD NETWORK BASIC COMMUNICATION 3 3 Reference Program ...
Страница 39: ...3 CC LINK IE FIELD NETWORK BASIC COMMUNICATION 3 3 Reference Program 37 3 ...
Страница 40: ...38 3 CC LINK IE FIELD NETWORK BASIC COMMUNICATION 3 3 Reference Program ...
Страница 57: ...4 SLMP COMMUNICATION 4 3 Reference Program 55 4 Program example ...
Страница 58: ...56 4 SLMP COMMUNICATION 4 3 Reference Program ...
Страница 59: ...4 SLMP COMMUNICATION 4 3 Reference Program 57 4 ...
Страница 60: ...58 4 SLMP COMMUNICATION 4 3 Reference Program ...
Страница 61: ...4 SLMP COMMUNICATION 4 3 Reference Program 59 4 ...
Страница 82: ...80 5 MODBUS TCP SLAVE 5 3 Reference Program Program example ...
Страница 83: ...5 MODBUS TCP SLAVE 5 3 Reference Program 81 5 ...
Страница 84: ...82 5 MODBUS TCP SLAVE 5 3 Reference Program ...
Страница 85: ...5 MODBUS TCP SLAVE 5 3 Reference Program 83 5 ...
Страница 86: ...84 5 MODBUS TCP SLAVE 5 3 Reference Program ...
Страница 110: ...108 6 N N NETWORK 6 4 Reference Program Program example ...
Страница 111: ...6 N N NETWORK 6 4 Reference Program 109 6 ...
Страница 112: ...110 6 N N NETWORK 6 4 Reference Program ...
Страница 147: ...7 MODBUS RTU ASCII SLAVE 7 4 Reference Program 145 7 Function code H03 Read holding register ...
Страница 149: ...7 MODBUS RTU ASCII SLAVE 7 4 Reference Program 147 7 ...
Страница 153: ......