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CHAPTER5 MEMORIES AND FILES USED FOR CPU MODULE
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5.1 Memories Used for CPU Module
5.1.9 Details of written files
5.1.9 Details of written files
For each file written to the CPU module, its name, size, and created date and time set at the file creation are
appended.
The file is displayed on the Read from PLC screen, opened by selecting [Online] [Read from PLC] in GX Developer,
as shown below.
(a) File name
1) File name structure and file specification
Each file name is composed of a name (up to 8 characters in one byte/4 characters in double bytes) and an
extension (3 characters).
Create a file name with upper-case characters only.
An extension is automatically appended according to the type set when the file was created.
2) Characters that cannot be used for a file name
The following reserved words for Microsoft Windows cannot be used as a file name.
COM1 to COM9, PRN, LPT1 to LPT9, NULL, AUX, CLOCK$, CON
3) How to specify a file name in the sequence program
Since the sequence program is not case-sensitive, the file can be named by both upper-case and lower-case
characters.
*Both "ABC" and "abc" are treated as "ABC".
In double-byte characters, an upper-case character and lower-case character are distinguished. Name a file
by an upper-case character.
*"ABC" and "abc" are distinguished.
(b) Date and time
The date and time when a file was written to the CPU module is shown.
The date and time are appended according to the clock set on the GX Developer (personal computer) side.
(c) Size
The file size when the file was written from GX Developer to the CPU module is shown in units of bytes (To
display the latest data, select [Online] [Read from PLC] and click the
button). At least 64
bytes (136 bytes for a program) are added to the file created by an user except a file register file.
( Section 5.3.3)
Figure 5.22 Displaying the details of a file
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