Setup Method - Omron CJ2 CPU UNIT User Manual

• The value for the Output OFF Bit (A500.15) will become unstable. Moreover, when the Output OFF
Bit turns ON, the outputs of all Output Units will turn OFF. To prevent the outputs of all Output Units
from turning OFF at startup, take countermeasures such as writing the following program section into
the ladder program.
First Cycle Flag
(A200.11)
• Bank 0 will be the EM current bank at startup.
• Files will not be held in the EM file memory (EM data converted to flash memory) and the file memory
function cannot be used. Make the EM file memory setting again in the PLC Setup, and format the
EM file memory.

Setup Method

The following flowchart shows the flow of setup operations for the CPU Unit.
Power ON
Is it necessary to hold
the values of I/O
memory data for the
next startup?
No
Are I/O memory
initial values
required for program
execution?
Yes
Can the I/O
memory initial
values be set by
the program?
No
Are the DM Area
settings (D20000 to
D32767) for Special I/O
Units and Inner Boards
the only initial values that
are required?
No
CJ2 CPU Unit Hardware User's Manual
RSET
A500.15
Operation with Battery
Yes
Which data is required?
CNT/HR/DM/EM
Operation without Battery
No
Yes
The initial values are set in
the user program.
Yes
DM Area beginning with
D00000, or EM Area
Other than the above.
7 Inspection and Maintenance
Normal Operation
(Memory Card Not Required)
CIO/W/TIM
PLC Setup:
CNT/H/DM/EM
Detect Low Battery
IOM Hold Bit: Hold
A500.12 (IOM Hold Bit): ON
Normal Operation
(Memory Card Not Required)
PLC Setup: Detect Low Battery
Normal Operation
(Memory Card Not Required, and
User Program and Parameter
Area Data Held in Flash Memory)
PLC Setup: Do Not Detect Low
Battery
Automatic Transfer at Startup
(Memory Card Required)
Transferred files:
AUTOEXEC.OBJ,
AUTOEXEC.STD,
AUTOEXEC.IOM
PLC Setup: Do Not Detect Low
Battery
Automatic Transfer at Startup
(Memory Card Required)
Transferred files: AUTOEXEC.OBJ,
AUTOEXEC.STD,
ATEXECDM.IOM, etc.
PLC Setup: Do Not Detect Low
Battery
Operation is not possible without a Battery.
7
7-9