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  • No : 22319
  • Release Date : 2018/08/30 13:55
  • Update : 2023/02/13 11:38
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Regarding the cause of communication error with GX Works3

The communication between GX Works3 and MELSEC iQ-F Series via Ethernet connection could not be enabled. What is the possible cause?
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From the PC's Internet Protocol Version 4 Properties, uncheck "Obtain an IP address automatically" option
and set an arbitrary IP adress that does not duplicate with the address of  FX5-CPU module.
Also, if the subnet mask is, the first three values (first - third octets) must match the FX5-CPU module's IP address.
*The default IP address of  FX5-CPU module is and for subnet mask.
As well, the security softwares (antivirus software) may be blocking the Ethernet communication.
Check if communication is enabled by temporarily disabling the security software or by authorizing communication through the security software settings.
Product Name
Product Category
CPU Module, Engineering Software
MELSEC iQ-F Series

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