Omron CJ1W-ETN21 Network Card User Manual


 
80
Using File Memory Section 4-7
4-7 Using File Memory
There are two media that can be used to store files in memory for CS/CJ-
series PLCs:
•Memory Cards
EM File Memory
4-7-1 File Memory
4-7-2 File Types
File Names
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.
Directories
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
Media Memory type Capacity Model File data recognized by CPU Unit
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)