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(3) Clearing the file register
The file register contents are backed up by the battery built in the CPU module, and they are held if the CPU
module is powered off or reset.
(Not initialized even if the latch is cleared.
*1
)
*1: The latch range of the file register can be set in the Device tab of the PLC parameter dialog box. ( Section 6.3)
To initialize the file register contents, perform the data clear operation in the sequence program or GX Developer.
(a) When clearing by the sequence program
(b) When clearing by GX Developer
Select [Online] [Clear PLC memory] in GX Developer and clear the data by selecting "Clear all file registers".
9.7.1 File register data storage location
There are the following three kinds of memory media for storing file register data.
• Standard RAM
•SRAM card
• Flash card
9.7.2 File register size
(1) When using the standard RAM
The table below shows the maximum points of file register data that can be stored in the standard RAM.
Note that, however, if the standard RAM is used for an application other than file registers, available points are
decreased. ( Section 5.1.10)
Figure 9.70 Example of clearing the file register R0 to R999
Table9.6 File register size
CPU module Points
Q00UCPU, Q01UCPU, Q02UCPU 64K
Q03UDCPU, Q03UDECPU 96K
Q04UDHCPU, Q04UDEHCPU 128K
Q06UDHCPU, Q06UDEHCPU 384K
Q10UDHCPU, Q10UDEHCPU, Q13UDHCPU,
Q13UDEHCPU
512K
Q20UDHCPU, Q20UDEHCPU, Q26UDHCPU,
Q26UDEHCPU
640K
FMOV K0 R0 K1000