Mitsubishi Electric FX3U-ENET-ADP, User Manual

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9 Troubleshooting
9.4 Troubleshooting Flowchart
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FX
3U
-ENET-ADP User's Manual
*1. If [ERR.] LED turns ON, refer to Section 9.1.
When an error is shown in the Error history (refer to Subsection 8.6.2) offered by the Ethernet
diagnostics function of GX Works2, check the error code, and check the contents of the error and take
countermeasures in accordance with Subsection 9.3.1.
*2. Error codes not found in the error code list may be returned to the external device side if the
communication data settings on the Ethernet adapter side (refer to Section 6.6) and the data code
settings on the external device side are different.
The Ethernet adapter cannot decode commands correctly if data with different data codes is received.
The Ethernet adapter returns error responses according to the communication data code settings.
<POINT>
1) When the Ethernet adapter is replaced due to an error, reboot the following external devices and restart
data communication:
(If the external device retains the Ethernet address, it may be impossible to continue communication
because when a adapter is replaced the Ethernet address changes.)
Similarly, when the external device (personal computer, etc.) is replaced, restart the Ethernet adapter
(PLC).
- All external devices that communicated with the station whose Ethernet adapter was replaced.
- All external devices that communicated with other stations' PLC via a station whose Ethernet adapter
was replaced.
2) When connecting a device to the Ethernet adapter, see the following sections for the required devices
and connection method:
Section 3.2: Devices Required for Network Configuration
Section 5.3: Connecting to the Network
3) When the Ethernet adapter often cannot receive messages sent from an external device (that is, when
the error log is long), it may be that considerable load is applied on the Ethernet network due to data
communication among connected devices.
To reduce the load to the Ethernet line, it is necessary to take corrective measures such as dividing the
network or reducing the data transmission frequency.
Consult your network administrator and take appropriate measures.
4) If the ground terminals of the Ethernet adapter are not set, the communication line is closed
(disconnected) due to the effects of noise, and as a result there may be no communication with external
devices.