Chapter 5 Modbus/Tcp (Slave); System Configuration - Mitsubishi Electric LE7-40GU Instruction Manual

5
MODBUS/TCP (SLAVE)
Since LE7-40GU supports the slave function of MODBUS/TCP communication which is an open FA network, it can
communicate with various MODBUS/TCP master equipment. Also, LE7-40GU (as a slave station) can perform data
monitoring and parameter writing from up to four master stations.
5.1

System Configuration

MODBUS/TCP
master equipment
Connection Communic Connection cable
equipment ation form
Cable type
name
MODBUS/ Ethernet • 100BASE-TX
TCP master Category 5 or
device more of shield
twisted pair
cable (STP) or
unshielded
twisted pair
cable (UTP)
• 10BASE-T
Category 3 or
more of shield
twisted pair
cable (STP) or
unshielded
twisted pair
cable (UTP)
*1 Connect with MODBUS/TCP master equipment via a hub.
Use cables, connectors, and hubs that satisfy the IEEE 802.3 10BASE-T/100BASE-TX/1000BASE-T standard.
*2 When connecting LE7-40GU to 10BASE (-T/2/5) compliant equipment, please use it in a network environment where 10 Mbps/100
Mbps can be mixed using a switching hub.
*3 This is the length between the hub and the node.
The maximum distance depends on the Ethernet device used.
When using a repeater hub, the number of units that can be connected is as follows.
· 10BASE-T: Cascade connection up to 4 units (500 m)
· 100BASE-TX: Cascade connection up to 2 units (205 m)
When using a switching hub, the cascade connection between switching hubs has no theoretical limit on the number that can be
cascaded.
Please check with the manufacturer of the switching hub used for any restrictions.
*4 For the twisted pair cable, please use a straight cable.
*5 For details, refer to the manual of the MODBUS/TCP master equipment used.
Hub
Connection Cable
External
device
Maximum
*4
segment
*3
length
*1
100 m Hub
Connection Cable
Connection cable Tension controller
Cable type Maximum Optional
*4
name segment equipment
*3
length
• 100BASE-TX 100 m  (Built-in to
Category 5 or main unit)
more of shield
twisted pair
cable (STP) or
unshielded
twisted pair
cable (UTP)
• 10BASE-T
Category 3 or
more of shield
twisted pair
cable (STP) or
unshielded
twisted pair
cable (UTP)
LE7-40GU
*2
Number of
connectable
Main
devices
unit
LE7-40GU Master
equipment:
When LE7-
40GU is N:1,
four or less
master
equipment for
one LE7-
40GU)
Master
equipment:
When LE7-
40GU is 1:N,
the following
number of LE7-
40GU units for
one master
device.
Depending on
the MODBUS/
TCP master
equipment
*5
used
5 MODBUS/TCP (SLAVE)
5.1 System Configuration
5
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