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3 TROUBLESHOOTING
3.4 Troubleshooting by Symptom
CPU module search on the network cannot be performed.
When the CPU module search on the network cannot be performed, check the following items.
Communications using the SLMP cannot be performed.
When communications using the SLMP cannot be performed, check the following items.
If the above action does not solve the problem, perform the module communication test to check for hardware failure. (
Page 284 Module communication test)
*3
*1 The buffer memory address is for when the network type of the RJ71EN71 or the RnENCPU (network part) is set to "Ethernet" and the
P1 connector is used.
When using the P2 connector or the CPU module (built-in Ethernet port part), or setting the network type to "Q Compatible Ethernet",
refer to the following.
Page 336 Buffer Memory
*2 If the connection of only the external device is closed due to cable disconnection, personal computer restart, or other reasons, reopen
the connection using the same port used before the error occurred. The E71 does not close a connection if it receives an Active open
request again from the external device with a different IP address or a port number.
*3 The module communication test cannot be performed for the CPU module (built-in Ethernet port part). Perform the troubleshooting of
the CPU module and check for hardware failure. ( MELSEC iQ-R CPU Module User's Manual (Startup))
Check item Action
Is "Do Not Respond to CPU Module Search" under "Security" of "Application
Settings" is set to "Do Not Respond"?
Set "Do Not Respond to CPU Module Search" under "Security" of "Application
Settings" to "Respond".
Is the CPU module cannot be searched connected to a router? The CPU module connected via a router cannot be searched.
Modify the connection to search the CPU module.
Is the CPU module cannot be searched connected with wireless LAN? Perform the search again. (The packet may be lost.)
Is the service processing (such as file read) load of the search target CPU
module high?
• Increase the response waiting time and perform the search again.
• Reduce the service processing load of the CPU module.
Check item Action
Has the connection with the external device been opened? (Check 'Open
completion signal' (Un\G1900000 to Un\G1900007)
*1*2
• If the connection with the external device is not opened, perform the open
processing.
• If an error occurs, check and eliminate the error cause.
Is the correct command format used for the command type, device, address,
and others?
Correct the command format. ( SLMP Reference Manual)
Is "Enable/Disable Online Change" under "Own Node Settings" in "Basic
Settings" set to"Disable All (SLMP)"?
If "Enable/Disable Online Change" is set to "Disable All (SLMP)", change the
setting to "Enable All (SLMP)". ( Page 242 Own Node Settings)
Did the external device send a command? If the device did not send a command, send a command to the Ethernet-
equipped module.
Was a response returned to the device that had sent the command? • If no response was returned, check if the correct IP address was specified
in the command. If not, correct the IP address and send the command
again.
• If a response was returned, check the end and error codes to correct the
error.
Is the communication method of the connection used for communication with
the external device is set to an item other than "SLMP" in the "External Device
Configuration" window of "Basic Settings"?
Correct the communication method setting if an item other than "SLMP" is set.
( Page 244 External Device Configuration)
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