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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
3. In FX
3U
/FX
3UC
 PLCs
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 (does not use the built-in program memory)
CPU
System ROM
Built-in program memory
(RAM)
Parameter
File register (D)
Comment
Sequence program
Special setting
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, time counting coil, and reset coil (T)
Counter contact, counting coil, and reset coil (C)
 ·  Extension register (R)
[Data memory]
Symbolic information
*1
CPU
System ROM
Built-in program memory
(RAM)
Not used
Memory cassette
(Flash memory)
Parameter
File register (D)
Special setting
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, 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)
Symbolic information
*1.  Supported in Ver. 3.00 or later.
*1