Mitsubishi Electric FX3G SERIES Programming Manual page 39

FX /FX /FX Series Programmable Controllers
3G 3U 3UC
Programming Manual - Basic & Applied Instruction Edition
Caution
Programs (when a memory cassette is not attached), latched (battery backed) type device values and clock data is not
backed up correctly when the battery voltage becomes low due to expiration of the battery life or another reason.
In such a case, clear latched (battery backed) type devices, transfer programs again (when a memory cassette is not
attached), and then set initial values and clock data if necessary.
→ For a rough guide to the life and replacement of the battery, refer to the PLC User's Manual
b) FX PLCs
3G
Data register (D)
Extension register (R) General type
Extension file register
(ER)
Index register (V, Z)
Timer present value
register (T)
Counter present value
register (C)
Clock data
*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.
*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
(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.
→ For the latched type device initialization method, refer to Subsection 2.6.5.
Item Power OFF
General type
Latched (EEPROM
backed) type
File type
Special type Cleared.
File type
V, Z
For 100 ms
For 10 ms
For 1 ms
Retentive type for 100
ms (EEPROM backed)
Retentive type for 1
ms(EEPROM backed)
General type
Latched (EEPROM
backed) type
High-speed type
(EEPROM backed)
Present value
(EEPROM backed)
2 Overview (Sequence Program)
2.6 Program Memory and Devices
Power
STOP→RUN
OFF→ON
Does not change.
*1
Cleared.
Does not change while M8033 is ON.
Does not change.
Does not change.
Set to initial
*2
values.
*1
Cleared.
Does not change.
Cleared.
Does not change.
Cleared.
Does not change while M8033 is ON.
Does not change.
Cleared.
Does not change while M8033 is ON.
Does not change.
Cleared.
Does not change while M8033 is ON.
Does not change.
Does not change.
Does not change.
Cleared.
Does not change while M8033 is ON.
Does not change.
Does not change.
Does not change.
→ For special data registers, refer to Chapter 37.
[Hardware Edition].
RUN→STOP
Cleared.
*2
Does not change.
Does not change.
Does not change.
Cleared.
Cleared.
Cleared.
Cleared.
*3
°C
) in the full charge state
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