User's Manual
8. ETHERNET CONNECTION
8.2 System Configuration
8 - 9
1
PREPARATORY 
PROCEDURES FOR 
MONITORING
2
DEVICE RANGE 
THAT CAN BE SET
3
ACCESS RANGE 
FOR MONITORING
4
HOW TO MONITOR 
REDUNTANT 
SYSTEM
5
BUS CONNECTION
6
DIRECT 
CONNECTION TO 
CPU
7
COMPUTER LINK 
CONNECTION
8
ETHERNET 
CONNECTION
 When connecting to MELSEC-FX
*1 The destination connected with the twisted pair cable varies with the configuration of the applicable Ethernet network system.
Connect to the Ethernet module, hub, transceiver or other system equipment corresponding to the applicable Ethernet network 
system.
Use cables, connectors, and hubs that meet the IEEE802.3 10BASE-T/100BASE-TX standard.
A cross cable is available for connecting the GOT to the Ethernet module.
*2 When connecting GT16 of the function version A to an equipment that meets the 10BASE (-T/2/5) standard, use the switching 
hub and operate in a 10Mbps/100Mbps mixed environment.
For how to check the function version, refer to the following.
GT16 User's Manual (Hardware)
*3 A length between a hub and a node.
The maximum distance differs depending on the Ethernet device to be used.
The following shows the number of the connectable nodes when a repeater hub is used.
• 10BASE-T: Max. 4 nodes for a cascade connection (500m)
• 100BASE-TX: Max. 2 nodes for a cascade connection (205m)
When switching hubs are used, the cascade connection between the switching hubs has no logical limit for the number of 
cascades.
For the limit, contact the switching hub manufacturer.
*4 For the system configuration of the Ethernet module, refer to the following manuals.
For FX Ethernet Interface Module User’s Manual
*5 Select one of the following [Controller Type] in [Ethernet] of GT Designer3.
• Ethernet module (FX Series): FX
For [Ethernet] of GT Designer3, refer to the following.
8.3.3 Ethernet setting
Ethernet
module
GOT
Connection cable
PLC CPU
Ethernet (FX), Gateway
Communication driver
PLC
Connection cable
*1
Maximum 
segment 
length
*3
GOT
Number of 
connectable 
equipment
Model name
Ethernet module
*4*5
Communication 
type
Cable model Option device Model
MELSEC-FX
(FX
3U, FX3G)
FX
3U-ENET Ethernet
Twisted pair cable
• 10BASE-T
Shielded twisted pair 
cable (STP) or unshielded 
twisted pair cable (UTP): 
Category 3, 4, and 5
• 100BASE-TX
Shielded twisted pair 
cable (STP): 
Category 5 and 5e
100m
- (Built into GOT)
*2
*7
2 GOTs
GT15-J71E71-100
MELSEC-FX
(FX
3UC, FX3GC)
FX
3UC-1PS-5V,
FX
2NC-CNV-IF
+
FX
3U-ENET
*6
Ethernet 100m
- (Built into GOT)
*2
*7
GT15-J71E71-100
MELSEC-FX
(FX
3U)
FX
3U-CNV-BD,
FX
3U-422-BD,
FX
3U-232-BD,
+
FX
3U
-ENET-ADP
*8*9
Ethernet 100m
- (Built into GOT)
*2
*7
4 GOTs
GT15-J71E71-100
MELSEC-FX
(FX
3UC)
FX
3U
-ENET-ADP Ethernet 100m
- (Built into GOT)
*2
*7
GT15-J71E71-100
MELSEC-FX
(FX
3G)
FX
3G
-CNV-ADP,
+
FX
3U
-ENET-ADP
*9
Ethernet
100m
- (Built into GOT)
*2
*7
MELSEC-FX
(FX
3GC)
FX
3U
-ENET-ADP
*9
Ethernet GT15-J71E71-100










