Mitsubishi Electric MELSEC FX3U Programming Manual page 39

FX /FX /FX Series Programmable Controllers
3G 3U 3UC
Programming Manual - Basic & Applied Instruction Edition
b) FX PLCs
3G
Data register (D)
Extension register
(R)
Extension file
register (ER)
Index register (V, Z) 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
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
General type
latched (battery
backed) type
File type
Special type Cleared.
General type
File type
For 100 ms
For 10 ms
For 1 ms
Retentive type for
100 ms (battery
backed)
Retentive type for 1
ms(battery backed)
General type
latched (battery
backed) type
High speed type
(battery backed)
Present value
(battery 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.
RUN→STOP
Cleared.
*2
Does not change.
Does not change.
Does not change.
Cleared.
Cleared.
Cleared.
Cleared.
*3
°C ) in the full
37
1
2
3
4
5
6
7
8
9
10