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When is an FX-Series PLC not an FX-Series PLC? Ethernet communications problem.

Bryon Sol


A common issue I see people having is connecting their new iQ-F (FX5 series) PLC to an HMI or other device over Ethernet.  The PLC simply won't respond and they can't get the connection to work.  

This root cause of this is usually the fact that the iQ-F PLC (FX5 series) does not talk the same protocol over Ethernet as the previous FX3 PLCs and before.  The FX5 uses what is called 3E Frame protocol whereas the the FX3 uses 1E.

When selecting the driver, make sure you select the protocol for the correct PLC.

In GT Designer3 for instance there's an iQ-F driver and an FX driver.


In iX Developer there are 3 possible drivers for Ethernet, FX ENET, FX3U/GE-ENET (for the ADP cards) and MC Protocol for iQ-F/L/Q etc

In In-Sight Explorer for Cognex you can see that there are various versions of MC Protocol


Making sure you have the correct version selected will allow you to connect your HMI or other device to your iQ-F (FX5) PLC.




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