Troubleshooting By Symptom; Communications Cannot Be Performed With The External Device - Mitsubishi Electric MELSEC iQ-RJ71EN71 User Manual

3.4

Troubleshooting by Symptom

This section describes troubleshooting method by symptom. If an error has occurred in the Ethernet-equipped module,
identify the error cause using the engineering tool. ( Page 282 Checking the Module Status)

Communications cannot be performed with the external device.

The following table lists how to troubleshoot the problem when the Ethernet-equipped module cannot communicate with the
external device.
Check item
Is the READY LED of the CPU module off?
Is the RUN LED of the RJ71EN71 or the RnENCPU (network part) off?
Is the Ethernet cable securely connected?
Does the external device conform to the Ethernet standard?
Is the external device powered on?
Does any error occur in the external device, hub, router, or other devices?
Does the protocol (TCP/IP or UDP/IP) match with that of the external device?
Is the access from the external device set to be denied in "IP Filter Settings"
under "Security" of "Application Settings".
Was a device on the line (such as an Ethernet-equipped module, external
device, hub, and router) replaced with the one with the same IP address?
Is the IP address of the external device specified correctly?
Is "Module Operation Mode" of "Application Settings" set to other mode than
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"Online"?
Has the initial processing been completed normally? (Check 'Initial status'
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(Un\G1900024.0))
Does the communication data code (ASCII or binary) setting match with that
of the external device?
Is the target connection in forcibly invalidated state in the "Force Deactivation
Status" column in the "Status of Each Connection" tab of the "Ethernet
Diagnostics" window?
Is the access from the Ethernet-equipped module denied by the security
setting of the external device?
For the RJ71EN71 or the RnENCPU (network part), is 'IP address change
function operating status' (Un\G11715.0) on?
Does a timeout occur when connecting to the engineering tool?
Action
If the READY LED of the CPU module is off, perform the troubleshooting of
the CPU module. ( MELSEC iQ-R CPU Module User's Manual
(Application))
If the RUN LED of the RJ71EN71 or the RnENCPU (network part) is off, reset
the CPU module. If the RUN LED is still off even after resetting the CPU
module, the possible cause is a hardware failure. Replace the RJ71EN71 or
RnENCPU and restart all the external devices that were performing
communications with the own station.
If the Ethernet cable is not securely connected, take following actions.
• Securely lock the cable.
• Check the wiring. ( MELSEC iQ-R Ethernet/CC-Link IE User's Manual
(Startup))
If the device does not conform to the Ethernet standard, replace it with one
conforming to the standard. ( MELSEC iQ-R Ethernet/CC-Link IE User's
Manual (Startup))
If the external device is not powered on, power it on.
If an error occurs, refer to the manual for each device and take action.
Correct the parameters so that the protocol matches with that of the external
device. ( Page 244 External Device Configuration)
If the access from the external device is denied, change the setting so that the
access is allowed. ( Page 263 IP Filter Settings)
If a device was replaced, take any of the following actions.
• Wait for update of the ARP cache (waiting time varies depending on the
device)
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• Restart all the devices on the line.
Execute a PING test to the IP address of the external device.
If the existence of the external device cannot be checked, network
configuration is incorrect. Consult with the system or network manager.
Set "Module Operation Mode" of "Application Settings" to "Online". ( Page
275 Module Operation Mode)
If the initial processing has not been completed successfully, correct the
module parameters. ( Page 241 PARAMETER SETTINGS)
If the data code settings do not match, data cannot be sent or received
because the external device cannot normally decode commands.
Set the same data code as that of the external device in "Communication Data
Code" under "Own Node Settings" of "Basic Settings". ( Page 242 Own
Node Settings)
Turn off the area corresponding to the target connection in 'Forced connection
invalidation setting area' (Un\G5646 to Un\G5650) to cancel the forced
invalidation.
Correct the security setting (such as firewall) of the external device.
When 'IP address change function operating status' (Un\G11715.0) is on, the
module is operating according to the settings of the IP address change
function. Either clear the IP address storage area, or correct the settings.
( Page 211 IP Address Change Function)
Increase the value for "Check at Communication Time" and "Retry Times" in
the following windows in the "Specify Connection Destination Connection"
window and connect again.
• "Host Station Detailed Setting" window of "No Specification"
• "Other Station Detailed Setting" window of "Other Station (Single Network)"
or "Other Station (Co-existence Network)"
3.4 Troubleshooting by Symptom
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3 TROUBLESHOOTING
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