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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
2.6.2 Memory operations and latched (battery or EEPROM backed) devices
(power ON/OFF and RUN/STOP)
1. Backup operation
The operations of the data memory, bit device memory and program memory in FX3S/FX3G/FX3GC/FX3U/FX3UC PLCs
are classified as shown below:
1) Types of program memory
*1. Symbolic information is supported in the FX
3U/FX3UC PLCs Ver. 3.00 or later.
*2. The contents of the program memory and device values are not backed up correctly in FX
3U/FX3UC PLCs
when the battery voltage becomes lower than the holding voltage if a memory cassette is not attached.
2) Types of word device memory
a) FX
3S PLC
*3. Some devices are cleared when the PLC status switches from STOP to RUN.
→ For special data registers, refer to Chapter 37.
*4. The clock data is held by the electricity charged in the large-capacity capacitor built in the PLC.
When the voltage of the large-capacity capacitor becomes low, the clock data is not held correctly.
The capacitor can hold the clock data for 10 days (when the ambient temperature is 25
°
C
) in the full charge state
(achieved by powering ON the PLC for 30 minutes or more).
Item Power OFF
Power
OFF→ON
STOP→RUN RUN→STOP
Parameter
Does not change.
*2
Sequence program
Does not change.
*2
Comment
Can be secured by
parameter setting.
Does not change.
*2
File register
Does not change.
*2
Special setting
Does not change.
*2
Symbolic information
*1
Does not change.
*2
Item Power OFF
Power
OFF→ON
STOP→RUN RUN→STOP
Data register (D)
General type Cleared.
Does not change. Cleared.
Does not change while M8033 is ON.
Latched (EEPROM
backed) type
Does not change.
File type Does not change.
Special type Cleared.
Set to initial
values.
*3
Does not change.
*3
Index register (V, Z) V, Z Cleared. Does not change.
Timer present value
register (T)
For 100 ms Cleared.
Does not change. Cleared.
Does not change while M8033 is ON.
For 10 ms Cleared.
Does not change. Cleared.
Does not change while M8033 is ON.
For 1 ms Cleared.
Does not change. Cleared.
Does not change while M8033 is ON.
Retentive type for 100 ms
(EEPROM backed)
Does not change.
Retentive type for 1 ms
(EEPROM backed)
Does not change.
Counter present value
register (C)
General type Cleared.
Does not change. Cleared.
Does not change while M8033 is ON.
Latched (EEPROM
backed) type
Does not change.
High-speed type
(EEPROM backed)
Does not change.
Clock data Present value
Does not change.
*4