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Conversion of PLC program from FX2N to FX5U

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Conversion of PLC program from FX2N to FX5U

Introduction
It is a common occurrence to convert a PLC program from FX2N to FX5U version, as part of a PLC upgrade project.

Procedure:
When converting from FX, FX0, FX1, FX2 to FX5 – convert it to FX3U First.
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Now we will convert the FX3U program to the FX5U PLC program:

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This step will depend on the following:

  • If there are modules… (existing) -then you need a conversion module… (option on the right).
  • If you are replacing everything with FX5 (putting in new modules) …then no conversion unit is required (option on the left)

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Restrictions and Limitations

  • It is important to understand that only logic can be converted from old to new. This conversion process will only work for the logic. There are major differences in the intelligent function capabilities (analog, communication, and high-speed counter functionalities) - and thus these are not directly convertible. These special functions are to be re-engineered. (If there is any intelligent functionality (analogs and communication) then this has the be configured separately.)

  • In addition - the inter-conversions of modular CPU type and compact CPU PLC programs are not possible.
    (these are to be manually rewritten.)

  • Also, the Mitsubishi PLCs are backward compatible but not forward compatible. This means that you can only migrate a program from an old CPU to a new CPU… but the converse is not possible. (for this, manual re-engineering is required.)