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Mitsubishi Electronics FX3G User Manual

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37
FX
3S
/FX
3G
/FX
3GC
/FX
3U
/FX
3UC
 Series
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
ai
l
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
b) FX
3G
/FX
3GC
 PLCs
*1.
These registers can be changed from the general type to the latched (battery backed) type by the parameter
setting when the optional battery is installed.
*2.
Some devices are cleared when the PLC status switches from STOP to RUN.
→ For special data registers, refer to Chapter 37.
*3.
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).
The clock data is backed up by the battery when the optional battery is installed and the battery mode is selected
in the parameter setting.
Item
Power OFF
Power 
OFF
→ON
STOP
→RUN
RUN
→STOP
Data register (D)
General type
Cleared.
*1
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.
*2
Does not change.
*2
Extension register (R) General type
Cleared.
*1
Does not change.
Extension file register 
(ER)
File type
Does not change.
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.
*3