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Mitsubishi Electronics FX3G User Manual

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FX
3S
/FX
3G
/FX
3GC
/FX
3U
/FX
3UC
 Series
Programming Manual - Basic & Applied Instruction Edition
2 Overview (Sequence Program)
2.6 Program Memory and Devices
1
Introdu
ction
2
Ov
ervi
ew
3
Instruction 
Li
st
4
D
evices 
in Det
ai
l
5
Specifi
ed the
De
vice
 &
 
C
onst
ant
6
Bef
ore
 
Pr
og
ra
mmi
ng
7
Bas
ic 
Instruction
8
FN
C00-FN
C0
9
Program Fl
ow
9
FNC
10-FN
C19
Mov
e & Com
pare
10
FNC
20-FNC
29
Arith. & Lo
gi
c 
Operati
on
2.6
Program Memory and Devices
2.6.1
Memory structure
1. In FX
3S
 PLC
FX
3S 
PLC 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)
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)
[Data memory]
Not attached
·
·
CPU
System ROM
Built-in program memory
(EEPROM)
Not used
(EEPROM)
Parameter
File register (D)
Comment
Sequence program
Built-in device memory (RAM, EEPROM)
[Bit device memory]
[Data memory]
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)
 
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.)