33
FX3G/FX3U/FX3UC Series Programmable Controllers
Programming Manual - Basic & Applied Instruction Edition
2 Overview (Sequence Program)
2.6 Program Memory and Devices
1
Introduction
2
Overview
3
Instruction
List
4
Devices
in Detail
5
Specified the
Device &
Constant
6
Before
Programming
7
Basic
Instruction
8
FNC00-FNC09
Program Flow
9
FNC10-FNC19
Move & Compare
10
FNC20-FNC29
Arith. & Logic
Operation
2. In FX3G PLCs
FX3G 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)
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 and time counting coil
Counter contact, counting coil, and reset coil 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)
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 and time counting coil
Counter contact, counting coil, and reset coil
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.)