Omron CJ1W-EIP21 用户手册

There are two media that can be used to store files in memory for CS/CJ-
series PLCs: 

• Memory Cards

• EM File Memory

■

Files are distinguished by assigning file names and extensions. The following
characters can be used in file names and extensions:

Alphanumeric characters: A to Z and 0 to 9. (Names converted to all-caps)
! & $ # ’ [ ] - ^ ( ) _

The following characters cannot be used in files names and extensions:

, . /  ? * ” : ; < > = + (spaces)

File names are not case sensitive and will be converted to all-caps in the PLC
file system. File names can be up to 8 character long with 3-character exten-
sions. An error will occur if a file name or extension is too long. The first period
(.) in a file name will be taken as the delimiter between the file name and
extension. Extensions are determined by the file type.

■

Up to five levels of directories (including root as the first level) can be created
as file storage locations. A maximum of 65 characters can be used in direc-
tory names.

CPU Unit

Memory Card

EM File 
Memory

File 

File 

File 

File 

CS/CJ-
series 
Memory 
Cards

Flash memory 8 MB

HMC-EF861

• Complete user program 
• Specified portions of I/O Memory
• Parameter area data (e.g. PLC

Setup)

15 MB

HMC-EF171

30 MB

HMC-EF371

EM File 
Memory

RAM

Max. capacity of EM Area 
in CPU Unit

All EM Area banks 
from specified bank in 
I/O Memory (specified 
in PLC Setup)