Mitsubishi Electric MELSEC iQ-RJ71EN71 User Manual page 298

When the problem cannot be solved with above actions, check the error cause according to the communication processing
and take action.
• Communications using the SLMP ( Page 298 Communications using the SLMP cannot be performed.)
• Communications using the predefined protocol ( Page 299 Communications using the predefined protocol cannot be
performed.)
• Socket communications/Communications using the fixed buffer ( Page 300 Socket communications/communications
using the fixed buffer cannot be performed.)
• Communications using the random access buffer ( Page 301 Communications using the random access buffer cannot
be performed.)
• Communications using a link dedicated instruction ( Page 303 Communications using a link dedicated instruction
cannot be performed.)
• File transfer function (FTP server) ( Page 303 Access using the file transfer function (FTP server) cannot be
performed.)
*1 A device on Ethernet has a table of IP addresses and their corresponding MAC address, called "ARP cache". When a device on the line
is replaced by the one having the same IP address, the MAC address in the ARP cache is different from that of the replaced device;
therefore, communications may not be normally performed. The "ARP cache" is updated by resetting the device or after a while. The
time varies depending on the device.
*2 If the communication data code setting is different between the Ethernet-equipped module and the external device, error codes that are
not found in the error code list may be returned to the external device. When receiving data with different data codes, the Ethernet-
equipped module cannot decode commands normally. The Ethernet-equipped module returns an error response according to the
communication data code setting.
*3 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
*4 Check this item only for the modules that have the relevant setting in the module parameters.
3 TROUBLESHOOTING
296
3.4 Troubleshooting by Symptom