Troubleshooting By Symptom; Communications Cannot Be Performed With The Connected Device - Mitsubishi Electric MELSEC-L SERIES Basic User Manual

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. (
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
Is the RUN LED of the E71 on?
Does the connected device conform to the Ethernet
standard?
Is the cable securely connected?
Is the network parameter mode set to "Online"?
Does the communication data code (ASCII or binary)
setting match with that of the connected device?
Has the initial process been completed normally? (Is Initial
normal completion signal (X19) on?)
Was a device on the line (such as an E71, connected
device, hub, and router) replaced by the one with the same
IP address?
Is the access from the connected device set to be denied
by the IP filter function?
Page 239, Section 16.2)
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.
Replace the device with one conforming to the Ethernet standard.
( Page 57, CHAPTER 5)
• Securely lock the cable.
• Check the wiring. (
Set the network parameter mode to "Online".
( Page 66, Section 7.1.2)
If the data code settings do not match, data cannot be sent or received
because the connected device cannot normally decode commands.
same data code as that of the connected device in "Communication Data
Code" of the Ethernet operation setting.
( Page 67, Section 7.1.3)
• 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.
Restart all the devices on the line.
If the access from the connected device is denied by the IP filter function,
correct the values in IP filter settings (address: 5700
IP filter setting by the reinitialization process again. (
14.3)
CHAPTER 16 TROUBLESHOOTING
Action
*1
Page 62, Section 6.2)
*1
to 5721
H
Page 175, Section
16
*2
Set the
) and perform
H
245