Mitsubishi Electric MELSEC-L Series - Troubleshooting by Symptom; Communications Cannot be Performed with the Connected Device

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CHAPTER 16 TROUBLESHOOTING
16
16.6 Troubleshooting by Symptom 16.6.1 Communications cannot be performed with the connected device.
16.6 Troubleshooting by Symptom
The following describes how to troubleshoot for each phenomenon. When an error occurs in the E71, identify the
cause with the programming tool. ( Page 239, Section 16.2)
16.6.1 Communications cannot be performed with the connected
device.
The following table lists how to troubleshoot the problem when the E71 cannot communicate with the connected
device.
Check item Action
Is the RUN LED of the E71 on?
Reset the CPU module. If resetting the CPU module does not turn on the
RUN LED on the E71, the hardware of the E71 may be faulty. Replace the
E71 and restart all the connected devices that were performing
communications with the own station.
*1
Does the connected device conform to the Ethernet
standard?
Replace the device with one conforming to the Ethernet standard.
( Page 57, CHAPTER 5)
Is the cable securely connected?
• Securely lock the cable.
• Check the wiring. ( Page 62, Section 6.2)
Is the network parameter mode set to "Online"?
Set the network parameter mode to "Online".
( Page 66, Section 7.1.2)
Does the communication data code (ASCII or binary)
setting match with that of the connected device?
If the data code settings do not match, data cannot be sent or received
because the connected device cannot normally decode commands.
*2
Set the
same data code as that of the connected device in "Communication Data
Code" of the Ethernet operation setting.
( Page 67, Section 7.1.3)
Has the initial process been completed normally? (Is Initial
normal completion signal (X19) on?)
• If Initial normal completion signal (X19) is off, perform the initial process.
( Page 311, Appendix 4)
• If the initial setting of the programming tool is same as that of the initial
process program, delete the initial process program.
Was a device on the line (such as an E71, connected
device, hub, and router) replaced by the one with the same
IP address?
Restart all the devices on the line.
*1
Is the access from the connected device set to be denied
by the IP filter function?
If the access from the connected device is denied by the IP filter function,
correct the values in IP filter settings (address: 5700
H
to 5721
H
) and perform
IP filter setting by the reinitialization process again. ( Page 175, Section
14.3)