Mitsubishi MELSEC FX3U Series User Manual (English)

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4 Conversion of the Projects

4.2 Precautions when Converting the Projects

Precautions for Instruction Replacement

When converting the projects of the FX3 Series to MELSEC iQ-F projects, the instructions may be changed or correction

required. The details are explained below.

Arguments

■Arguments of function with "_E"

For functions with “_E”, the positions of the arguments are different between GX Works2 and GX Works3. Therefore the

projects must be modified after conversion.

• GX Works2: EN is specified by the first argument and "ENO" is the return value.

• GX Works3: EN is specified by the first argument, ENO is specified by the second argument, and the result is the return

value. (The value is the same as function without "_E".)

■Data type of arguments

The required data type of arguments for some instructions, functions, function blocks of GX Works2, and the required data

type of arguments for the instructions, functions, function blocks of GX Works3 are different. Therefore, an error may occur

because of data type mismatch when reusing the program of GX Works2. In that case, modify the instruction name or

arguments.

Ex.

INC instruction

• When handling a value exceeding 32767 (maximum value of word [signed]), replace to “INC_U”.

• When word [unsigned]/bit array [16-bit] type label is specified for the parameter, replace to “INC_U”.

■The number and order of arguments

The number and order of arguments of some instructions in GX Works2 is different from those of GX Works3. In that case,

modify the arguments.

Ex.

(D)TO instruction

• GX Works2: (S)(n1)(n2)(n3)

• GX Works3: (UnHn)(s1)(s2)(n)

When the order of the arguments in GX Works2 is 1, 2, 3, and 4, the order in GX Works3 is 2, 3, 1, and 4.

■Argument requiring multiple points

When using a label as an argument that requires multiple points, use an array label having at least as many elements as

required of the argument.

Instructions/FB/FUN that are not supported by the MELSEC iQ-F Series

For the instructions/FB/FUN that are not supported by the MELSEC iQ-F Series, refer to the following manual to correct the

program so that the instructions/FB/FUN will be equivalent to the one in the manual.

MELSEC iQ-F FX5 Programming Manual (Instructions, Standard Functions/Function Block)

Instructions Requiring Special Action When Replacing Structured Ladder to FBD/LD

Instructions

The following instructions require action after the project conversion.

Instruction list Action content

DHSCR DSWAP PLSV The connecting position of the parameter is different from GX

Works2.

After replacing to FX5, select the appropriate instruction and

perform “Edit” → ”FB/FUN update” in the right-click menu, and

then adjust the connecting position.

PLSY DSWAPP DPLSV

DPLSY DSZR DRVI

PWM DVIT DDRVI

SWAP DDVIT DRVA

SWAPP DABS DDRVA

DHSCS_I When an out of range “I” device is specified as parameter “i”,

parameter “i” will be replaced with P4095.

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Mitsubishi MELSEC FX3U Series Specifications

General

Series	MELSEC FX3U
Program Memory	64k steps
Type	PLC (Programmable Logic Controller)
I/O Capacity	Up to 384 points (with expansion)
Programming Language	Function Block Diagram
Communication Protocols	RS-422, RS-485
Power Supply	24 VDC or 100-240 VAC
Execution Speed	0.065 μs per basic instruction
Built-in Functions	PID control
Built-in Communication Ports	RS-422
Expansion Modules	communication modules
High-speed Counters	Up to 6 channels, up to 100 kHz
Pulse Output	Up to 100 kHz
Operating Temperature	0°C to 55°C