6
FUNCTIONS
6.29 Latch Data Backup Function (to Standard ROM)
6
- 209
1
O
verv
iew
2
Per
fo
rma
nce
S
p
ecifica
tio
n
3
S
equ
en
ce P
ro
g
ra
m
Co
nfig
ura
tio
n a
nd
E
xecut
io
n Co
nd
iti
o
ns
4
I/O N
unb
er
Assig
n
m
e
nt
5
Me
mor
ie
s a
nd
File
s
Ha
nd
led
by CP
U Mo
du
le
6
Func
tions
7
Co
mmu
nic
a
tion
us
in
g
bu
ilt
-i
n E
th
e
rne
t po
rt
s o
f
CP
U mod
u
le
8
Co
mm
un
icatio
n
w
ith
Int
e
lli
ge
nt
Fun
ction
Mo
du
le
POINT
When backing up the data of the file register, extended data register (D), and
extended link register (W), pay attention to the following points.
• The data is backed up only when the file register in the standard RAM is
set to be used.
• Check the "Transfer to Standard ROM at Latch data backup operation."
checkbox on the PLC file tab of PLC parameter.
(3) File capacity for storing data to be backuped
The system automatically creates files for storing the data that is backuped at the time
of executing latch data backup to the standard ROM.
Table 6.57 shows the size of storage file used for the latch data backup function (to
standard ROM).
* 1 : The file size of the Q02UCPU is 87138 bytes.
* 2 : Increased or decreased depending on the parameter setting.
* 3 : Only when the data of the file register, extended data register (D), and extended link register (W)
are backed up, storage files are created.
* 4 : Only when the sampling trace setting has been registered, storage files are created.
Figure 6.125 PLC file setting screen
Table6.63 List of data to be backuped
Data to be backuped
File size
Device data
• Internal user device
(M, L, B, F, V, T, ST, C, D, W)
• Index register (Z)/standard device register (Z)
110818
*1
(At default device
assignment setting)
*2
Error history
SFC program continuation start information
• File register (R, ZR)
*3
• Extended data register (D)
*3
• Extended link register (W)
*3
64+2 Number of file register
points
Trace setting (Sampling trace file)
*4
16 + Sampling trace file size
If checked,
backup is mode
