Omron CJ1W-ETN21 operation manual Using File Memory, File Names, Directories

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

CPU Unit

File

Memory Card

File

File

EM File

Memory

File

4-7-1	File Memory
Media		Memory type	Capacity	Model	File data recognized by CPU Unit
CS/CJ-		Flash memory	8 MB	HMC-EF861	• Complete user program
series					• Specified portions of I/O Memory
			15 MB	HMC-EF171
Memory					• Parameter area data (e.g. PLC
			30 MB	HMC-EF371
Cards
					Setup)
EM File		RAM	Max. capacity of EM Area	All EM Area banks
Memory			in CPU Unit	from specified bank in
				I/O Memory (specified
				in PLC Setup)
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.

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