Chapter 2 Replacement From Fx3U To Fx5U; Outline; Replacement Procedure - Mitsubishi MELSEC FX3U Series Handbook

2
Replacement from FX3U to FX5U
2.1

Outline

FX5U, which is the successor model of the FX3U, is equipped with analog functions, communication and 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 to the successor model FX5U are shown below. Please consider replacement with
the information.
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.
2.2

Replacement Procedure

The replacement procedure is shown below.
The successor model FX5U is recommended when replacing from FX3U.
1.
Selection of the models
Select the substitute models.
Page 19 Selection of Substitute Models
2.
Conversion of the program
Convert the program used in FX3U to be able to use in FX5U.
Page 32 Conversion of the Projects
3.
Replacement to the substitute models
Replace the PLCs.
Page 24 Replacement of the PLC
2 Replacement from FX3U to FX5U
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2.1 Outline