Outline; Replacement Procedure - Mitsubishi Electric MELSEC iQ-F Series Handbook

5
Replacement from FX3U to FX5U
5.1

Outline

The FX5U is equipped with analog functions, communication, high-speed input/output, etc. and can easily be expanded with
expansion boards and expansion adapters. The high-speed system bus communication brings out the maximum performance
of extension modules equipped with intelligent functions.
The procedures and points for replacing an existing model with the FX5U are shown below. Use this information to consider
replacing existing models.
Points to Consider
• The "recommended substitute models" are described for individual FX3U and extension modules that can be replaced by
iQ-F Series models. According to usage and system configuration (connection status of the extension modules), and cases
when the I/O numbers actually used are small, other models than the described "recommended substitute models" may be
suitable for replacement.
• The recommended substitute models for extension modules, function expansion boards and built-in batteries are described
with those that can be connected to the FX5U CPU module.
• Contents that require special caution when replacing each model are described in "Special notes". Most recommended
substitute models have various differences in specifications other than those in "Special notes" such as the dimension
becoming smaller than the current models. Therefore, when considering usage, please check not only the "Special notes"
but also the details of each specification for the dimension and power specifications etc., in the manual.
• Based on the above conditions, "No recommended substitute models" is described for those without a recommended
substitute model, but there are cases that can be replaced with an FX5U system configuration according to usage and
system configuration. Check the necessary functions and features when considering the replacement with FX5U system
configuration.
5.2

Replacement Procedure

The procedure for replacing the FX3U with the FX5U is shown below.
For details on replacing the FX3U with the FX5UJ, refer to  Page 49 Replacement from FX3U to FX5UJ.
1.
Selection of the models
Select the substitute models.
Page 64 Selection of Substitute Models
2.
Conversion of the program
Convert the program used in FX3U to be able to use in FX5U.
Page 70 Conversion of the Projects
3.
Replacement to the substitute models
Replace the PLCs.
Page 76 Replacement of the PLC
5 Replacement from FX3U to FX5U
5.1 Outline
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