Omron CJ - PROGRAMMING MANUAL 12-2009 Programming Manual page 48

Internal Structure of the CPU Unit
Flash Memory
(CS1-H, CJ1-H, CJ1M, or
CS1D CPU Units only)
Automatic
User program
write
Automatic
write
Parameter area
Comment memory
area
FB program memory
area
Note
8
transfer from the CX-Programmer or a transfer from the Memory Card. If the
PLC Setup's Detect Low Battery setting is set to Do not detect, the Parameter
Area data will not be lost even if the battery voltage drops.
Note The CS1G/H-CPU@@(-V1) and CJ1@-CPU@@ CPU Units are not equipped
with the flash memory functions and the data is backed up by the battery.
Consequently, the data is not backed up when battery is not installed.
I/O Memory Areas
This data is backed up by the battery (CS1W-BAT01 in CS-series PLCs,
CPM2A-BAT01 in CJ1H PLCs, or CJ1W-BAT01 in CJ1M PLCs). If the battery
voltage drops, this data will be lost.
Comment Memory Area and Source Memory Area
The CPU Unit backs up this data in its internal flash memory. When a com-
ment file or function block used in the program is transferred from the CX-Pro-
grammer, it is stored in flash memory. Even if the battery voltage drops, the
data will not be lost.
Only CPU Units with unit version 3.0 or later are equipped with this memory.
CPU Unit
Built-in RAM
I/O memory area
Drive 1: EM file memory
(See note 2.)
User program
Parameter area
(See note 1.)
1. The BKUP indicator on the front of the CPU Unit will light while data is be-
ing written to flash memory. Do not turn OFF the power supply to the CPU
Unit until the backup operation has been completed (i.e., until the BKUP
indicator goes out). Refer to 6-6-11 Flash Memory for details.
2. A Battery is mounted to a CS1-H, CJ1, CJ1-H, CJ1M, or CS1D CPU Unit
when it is shipped from the factory. There is no need to clear memory or
set the time.
Backup
Battery
A newly mounted battery will be good up to
five years at an ambient temperature of 25°C
Drive 0: Memory Card
(flash memory)
File memory
Automatically backed up to flash memory whenever a write
operation for the user memory area (user program or parameter
area) is performed from a Programming Device.
Used to store symbol table files, comment files, and program
index files. CPU Units with unit version 3.0 or later, Memory
Card, EM file memory, or comment memory can be selected as
the destination when transferring projects from CX-Programmer
Ver. 5.0.
When transferring projects containing function blocks from the
CX-Programmer for CPU Units with unit version 3.0 or later,
the function block program information is automatically stored
in the FB program memory area.
Section 1-3