6 Introduction of Functions
33
FX3U-ENET-ADP User's Manual
1
Introduction
2
Specification
3
System
Configuration
4
Installation
5
Wiring
6
Introduction of
Functions
7
Communication
Using
MC Protocol
8
The Operation
of GX Works2
9
Troubleshooting
A
List of Special
Devices
6.2 Details of functions
6.2.3 MELSOFT Direct Connection (Simple Connection)
This function connects the Ethernet adapter attached to the main unit to a MELSOFT product (such as GX
Works2) with one Ethernet cable without using the hub.
The direct connection enables communication by only specifying the connection target. IP address setting is
not required.
For direct connection operation of GX Works2, refer to Section 8.5.1.
Caution
• When the item "Disable direct connection to MELSOFT" is checked in the Ethernet adapter setting, direct
connection is disabled. Check this item to prevent illegal connections from remote places.
• When the Ethernet adapter is connected to the LAN line, do not set direct connection. It may increase the
load on the line and adversely affect communication or other devices.
• Do not configure direct connection in a system configuration that connects the Ethernet adapter with an
external device using a hub.
• When two or more Ethernet ports are enabled in the network connections setting on the personal
computer, communication by direct connection is not possible. In the setting, leave only one Ethernet port
enabled for direct connection and disable the other Ethernet ports.
• Under the following conditions, direct connection communication may not be available. In that case, check
the setting of the Ethernet adapter, main unit and/or personal computer.
- When all bits corresponding to "0" of the subnet mask in the personal computer are ON or OFF
- When all bits corresponding to the host address in each class of IP address in the personal computer
are ON or OFF
6.2.4 Find CPU function
This function searches Ethernet adapters (connected to PLC main units) connected to the same hub as the
personal computer using GX Works2, and enables selection of a desired Ethernet adapter (PLC main unit)
from the list of found Ethernet adapters (PLC main units) and acquisition of the IP address.
For operation of GX Works2, refer to Section 8.5.2.
Caution
• When the item "Do not respond to search for CPU on network" is checked in the Ethernet adapter setting,
the Ethernet adapter does not respond to search for CPU on the network.
• Ethernet adapter (PLC main unit CPU) connected to a cascade connected hub are also found and
displayed in the list.
• Ethernet adapter (PLC main unit CPU) connected via a router cannot be found.
• If Ethernet adapter (PLC main unit CPU) with the same IP address are found in the list, correct the
parameter settings of the Ethernet adapter side IP address. If communication is performed in this situation,
a communication error occurs.
• Search for CPU may be disabled when the scan time in the main unit is long. In such a case, make the
response waiting time longer on the search for CPU screen.
• When "*****" is displayed as the comment, the keyword setting in the main unit is set to "Read and write
prohibited" or "All online operations prohibited".
FX3U/FX3UC PLC
FX
3U-ENET-ADP
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