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File Memory Instructions Section 3-26
3-26 File Memory Instructions
This section describes instructions used with file memory (EM Area or Mem-
ory Cards).
Note File memory can also be manipulated by executing CMND(490) to send a
FINS command to the local CPU Unit. Refer to the CS/CJ-series PLC Opera-
tion Manual for details.
3-26-1 Precautions when Using Memory Cards
Confirm the following items before using a Memory Card.
Format
Memory Cards are formatted before shipping. There is no need to format
them after purchase. To format them once they have been used, always do so
in the CPU Unit using the CX-Programmer or a Programming Console.
If a Memory Card is formatted directly in a notebook computer or other com-
puter, the CPU Unit may not recognize the Memory Card. If this occurs, you
will not be able to use the Memory Card even if it is reformatted in the CPU
Unit.
Number of Files in Root Directory
There is a limit to the number of files that can be placed in the root directory of
a Memory Card (just as there is a limit for a hard disk). Although the limit
depends on the type and format of the Memory Card, it will be between 128
and 512 files. When using applications that write log files or other files at a
specific interval, write the files to a subdirectory rather than to the root direc-
tory.
DeviceNet
CJ1W-DRM21 DeviceNet Unit
(CPU Bus Unit with unit number 2)
Node address 07
CS1W-DRM21 DeviceNet Unit
CPU Unit
ECHWR(724)
instruction
CPU
Unit
Explicit
message
Unit address 12 hex (because
the unit number is 2)
D: D00100
D+1: D00101
D+2: D00102
S: D00000
S+1: D00001
S+2: D00002
15 8 7 0
C: D00200 0 0 0 7
C+1: D00201 0 0 0 3
C+2: D00202 0 6 1 2
C+3: D00203 0 0 0 0
C+4: D00204 0 0 0 0
Node address of remote CPU Unit to be written to = 07 hex (node 07)
Write data size (number of words) = 3 hex
Communications port = 6 hex (port 6),
and the DeviceNet Unit’s unit address = 12 hex
Response monitoring time = 0000 hex (2 s)
Explicit format type = 0000 hex (DeviceNet format)
Instruction Mnemonic Function code Page
READ DATA FILE FREAD 700 1099
WRITE DATA FILE FWRIT 701 1106
WRITE TEXT FILE TWRIT 704 1113
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