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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
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
2.6 Program Memory and Devices
2.6.1 Memory structure
1. In FX3S PLC
FX3S 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.)