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FX3S/FX3G/FX3GC/FX3U/FX3UC Series
Programming Manual - Basic & Applied Instruction Edition
2 Overview (Sequence Program)
2.6 Program Memory and Devices
2. In FX3G/FX3GC PLCs
FX3G/FX3GC 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
*1
(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
3G
PLC.