Omron CJ1W-EIP21 User Manual

The files described in the following table can be read or written by the CPU
Unit.

1.

Refer to information on  file  memory  in  the  CS/CJ-series Programmable
Controllers Operation Manual (W339).

2.

All files transferred automatically at startup must have the name AUTOEX-
EC.

Data file

********

.IOM

Specified ranges of 
I/O Memory

• Contains word (16-bit) data from a starting 

word through an end word in one memory 
area.

• The following areas can be used: CIO, HR, 

WR, AR, DM, and EM.

Program file

********

.OBJ

Complete user pro-
gram

• Contains all the programs for cyclic tasks 

and interrupt tasks, as well as task infor-
mation for one CPU Unit.

Parameter area file

********

.STD

• PLC Setup
• Registered I/O 

tables

• Routing tables
• CPU Bus Unit 

Setup and other 
setup data

• Contains all of the parameter data for one 

CPU Unit.

• There is no need for the user to distinguish 

the various types of data contained in the 
file.

• The file can be automatically read to or 

written from the CPU Unit simply by speci-
fying the extension (.STD) 

Files 
trans-
ferred at 
startup

Data files

AUTOEXEC

.IOM

I/O Memory data for 
the specified number 
of words starting from 
D20000

• There does not necessarily need to be a 

data file in the Memory Card when the 
automatic file transfer function is used at 
startup.

• The AUTOEXEC.IOM file always contains 

DM Area data starting at D20000.

• All data in the file will be transferred to 

memory starting at D20000 at startup.

Program 
files

AUTOEXEC

.OBJ

Complete user pro-
gram

• There must be a program file in the Mem-

ory Card when the automatic file transfer 
function is used at startup.

• Contains all the programs for cyclic tasks 

and interrupt tasks, as well as task infor-
mation for one CPU Unit.

Parameter 
area file

AUTOEXEC

.STD

• PLC Setup
• Registered I/O 

tables

• Routing tables
• CPU Bus Unit 

Setup and other 
setup data

• There must be a parameter file in the 

Memory Card when the automatic file 
transfer function is used at startup.

• Contains all of the parameter data for one 

CPU Unit.

• There is no need for the user to distinguish 

the various types of data contained in the 
file.

• All parameters in the file will be automati-

cally transferred to specified locations in 
memory at startup.