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FX
3G
/FX
3U
/FX
3UC
Series Programmable Controllers
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
ail
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
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)
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 and time counting coil
Counter contact, counting coil, and reset coil
•
Extension register (R)
[Data memory]
Symbolic information
*1. Supported in Ver. 3.00 or later.
*1