Mitsubishi Electronics FX3G User Manual

/FX

3GC

/FX

3UC

Series

Programming Manual - Basic & Applied Instruction Edition

2 Overview (Sequence Program)

2.6 Program Memory and Devices

2. In FX

/FX

3GC

PLCs

/FX

3GC

PLCs are equipped with the EEPROM memory as standard.

1) When using the built-in memory (without attached memory cassette)

2) When using an attached memory cassette

(without using the built-in program memory)

CPU

System ROM

Built-in program memory

(EEPROM)

Parameter

File register (D)

Special setting

Comment

Sequence program

(EEPROM)

Memory cassette

Built-in device memory (RAM, EEPROM)

[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, time counting coil, and reset coil (T)
Counter contact, counting coil, and reset coil (C)

· Extension register (R)

[Data memory]

Transfer and initialization by

instructions

Extension file register (ER)

Not attached

CPU

System ROM

Built-in program memory

(EEPROM)

Not used

(EEPROM)

Parameter

File register (D)

Special setting

Comment

Sequence program

Extension file register (ER)

Built-in device memory (RAM, EEPROM)

[Bit device memory]

[Data memory]

Transfer and initialization by

instructions

Contact image memory
·

Input relay (X)

Output relay (Y)

· Auxiliary relay (M) · State relay (S)
Timer contact, time counting coil, and reset coil (T)
Counter contact, counting coil, and reset coil (C)

· Data register (D)

· Timer present value register (T)

· Counter present value register (C)
· Index register (V, Z)

· Extension register (R)

Memory cassette

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

*1. A memory cassette can be connected only to FX

PLC.