41
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
2.6.3 Types of backup methods against power failure
There are following types of latch (battery backup) for the program memory and built-in devices in the PLC.
1. Battery backup method
a) FX3U/FX3UC PLC
b) FX
3G PLCs
2. Memory cassette backup method
a) FX3U/FX3UC PLC
b) FX
3G PLCs
3. EEPROM memory (built in PLC) backup method
a) FX3G PLCs
Item Description
Latched (battery
backed) contents
The battery backs up the RAM memory built in the PLC, latched (battery backed) type devices and
clock data.
Maintenance
The battery life is around 5 years, (when the ambient temperature is 25°C).
For replacement information, refer to the Users Manual [Hardware Edition] of each PLC.
Cautions
1) When the battery voltage becomes low, sequence programs and other latched (battery backed)
contents are lost.
2) When an optional memory cassette (flash memory) is mounted, it is not necessary to back up
sequence programs by the battery.
Item Description
Latched (battery
backed) contents
The optional battery backs up the RAM memory built in the PLC and clock data.
Maintenance
The battery life is around 5 years, (when the ambient temperature is 25°C).
For replacement information, refer to the Users Manual [Hardware Edition] of each PLC.
Cautions
When the optional battery voltage becomes low, the RAM memory built in the PLC and clock data are
lost.
Item Description
Latched (battery
backed) contents
1) The flash memory built into the memory cassette backs up sequence programs.
2) A battery is required to back up latched (battery backed) devices and clock data from failure.
Maintenance Maintenance is not necessary.
Cautions
The upper limit is set to the number of times for overwriting.
(Refer to the Hardware Edition of the main unit.)
Item Description
Latched (battery
backed) contents
The EEPROM memory built in the memory cassette backs up sequence programs.
Maintenance Maintenance is not necessary.
Cautions
The upper limit is set to the number of times for overwriting.
(Refer to the Hardware Edition of the main unit.)
Item Description
Latched (battery
backed) contents
The EEPROM memory built in the PLC backs up latched (battery backed) type devices and sequence
programs.
Maintenance Maintenance is not necessary.
Cautions
The upper limit is set to the number of times for overwriting.
(Refer to the Hardware Edition of the main unit.)
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