Block Diagram Of Cpu Unit Memory - Omron CJ - PROGRAMMING MANUAL 12-2009 Programming Manual

Internal Structure of the CPU Unit
PLC Setup
DIP Switches
Memory Cards
Flash Memory
1-3-2

Block Diagram of CPU Unit Memory

The PLC Setup is used to set various initial or other settings through software
switches.
DIP switches are used to set initial or other settings through hardware
switches.
Memory Cards are used as needed to store data such as programs, I/O mem-
ory data, the PLC Setup, and I/O comments created by Programming
Devices. Programs and various system settings can be written automatically
from the Memory Card when power is turned ON (automatic transfer at star-
tup).
The user program and parameter area data, such as the PLC Setup, are auto-
matically backed up in the built-in flash memory whenever the user writes
data to the CPU Unit. This enables battery-free operation without using a
Memory Card. I/O memory, including most of the DM Area, are not backed up
without a battery.
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 a battery is not installed.
CPU Unit memory (RAM) is comprised of the following blocks in the CS/CJ
Series:
Area name
User Program User program
Area
Parameter PLC Setup, Regis-
Area tered I/O Tables,
Routing Tables, and
CPU Bus Unit set-
tings
I/O Memory Data areas such as
Areas the HR, DM, and EM
Areas
Comment Comment information Internal flash mem-
Memory Area
Source Mem- Function block
ory Area information
User Program Area
The CPU Unit backs up this data in internal flash memory. The user program
is automatically backed up in flash memory if it was overwritten by a program
transfer from the CX-Programmer, online editing, or a transfer from the Mem-
ory Card. Even if the battery voltage drops, the user program data will not be
lost.
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 a battery is not installed.
Parameter Area (PLC Setup, Registered I/O Tables, Routing Tables, and
CPU Bus Unit Settings)
If the PLC Setup's Detect Low Battery setting is set to Do not detect, this data
is backed up in the internal flash memory. The data is automatically backed up
in flash memory if the parameters are overwritten by an operation such as a
Contents Backup method
Internal flash
memory
Battery and internal
flash memory
Battery
ory
Internal flash mem-
ory
Section 1-3
Status when battery
voltage drops
Data is not lost.
Data is not lost when
the PLC Setup's
Detect Low Battery
setting is set to Do
not detect.
Data is not lost.
Data is not lost.
Data is not lost.
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