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FX

3G

/FX

3U

/FX

3UC

 Series Programmable Controllers

Programming Manual - Basic & Applied Instruction Edition

2 Overview (Sequence Program)

FX

3U

/FX

3UC 

PLCs are equipped with the RAM memory as standard.  

By mounting a memory cassette, the memory type can be changed.
1) When using the built-in memory (without attached memory cassette)

2) When using an attached memory cassette (dose not use the built-in program memory)

CPU

System ROM

Built-in program memory

(RAM)

Parameter

File register (D)

Comment

Sequence program

Memory cassette

(Flash memory)

Not attached

Built-in device memory (RAM)

[Bit device memory]

 • Data register (D)

 • Timer present value register (T)

 • Counter present value register (C)

 • Index register (V, Z)

Contact image memory
 

• Input relay (X)

• Output relay (Y)

 

• Auxiliary relay (M) • State relay (S)

Timer contact and time counting coil
Counter contact, counting coil, and reset coil

 

• Extension register (R)

[Data memory]

CPU

System ROM

Built-in program memory

(RAM)

Not used

Memory cassette

(Flash memory)

Parameter

File register (D)

Comment

Sequence program

Extension file register (ER)

The PLC automatically recognizes attachment of a 
memory cassette (when the power is turned ON), 
and disconnects the built-on program memory. 
 (Priority is given to the memory cassette.)

Built-in device memory (RAM)

[Bit device memory]

[Data memory]

T

ransfer and initialization by

instructions

Contact image memory
 

• Input relay (X)

• Output relay (Y)

 

• Auxiliary relay (M) • State relay (S)

Timer contact and time counting coil
Counter contact, counting coil, and reset coil

 • Data register (D)

 • Timer present value register (T)

 • Counter present value register (C)

 • Index register (V, Z)

 

• Extension register (R)