Memory Operations And Backup Against Power Interruption (Power On/Off And Run/Stop) - Mitsubishi Electric MELSEC-Q Structured Programming Manual

FXCPU Structured Programming Manual
[Device & Common]
1.2.2 Memory operations and backup against power interruption (power ON/OFF and
RUN/STOP)
1. FX /FX PLCs
3U 3UC
1) Types of program memory
Parameter
Sequence program
Comment
File register
Special setting
Symbolic information
2) Types of word device memory
Data register (D)
Extension register (R)
Extension file register
*5
(ER)
Index register (V and Z)
Timer current value
register (T)
Counter current value
register (C)
Clock data
*1. Available in Ver. 3.00 or later.
*2. The program memory contents or device status is not held correctly when the battery voltage
becomes lower than the holding voltage if a memory cassette is not attached.
*3. The device status is not held correctly when the battery voltage becomes lower than the holding
voltage.
*4. Some devices are cleared when the PLC mode switches from STOP to RUN.
*5. An optional memory cassette is required.
22
Item
Can be secured by
parameter setting.
*1
Item
General type
Latched (backed-up) type
File type
Special type
Latched (backed-up) type
File type
V, Z
For 100 ms
For 10 ms
Retentive type for 100 ms
Retentive type for 1 ms
General type
Latched (backed-up) type
High speed type
Current value
Power OFF Power OFF→ON
Does not change.
Does not change.
Does not change.
Does not change.
Does not change.
Does not change.
Power OFF Power OFF→ON
Cleared.
Does not change.
Does not change.
Set to initial
Cleared.
*4
value.
Does not change.
Does not change.
Cleared.
Cleared.
Cleared.
Does not change.
Does not change.
Cleared.
Does not change.
Does not change.
Does not change.
→ For special data registers, refer to Chapter 4.
1 Device Outline
1.2 Program Memory and Devices
STOP→RUN RUN→STOP
*2
*2
*2
*2
*2
*2
STOP→RUN RUN→STOP
Does not change. Cleared.
Does not change while M8033 is ON.
*3
*2
*4
Does not change.
*3
Does not change.
Does not change. Cleared.
Does not change while M8033 is ON.
Does not change. Cleared.
Does not change while M8033 is ON.
*3
*3
Does not change. Cleared.
Does not change while M8033 is ON.
*3
*3
*3