9 FTP Server
9-16
CJ-series EtherNet/IP Units Operation Manual for NJ-series CPU Unit (W495)
The IOM format is a data format used for binary data specified by the ladder instructions, FileReadVar
(Read Variables File) and FileWriteVar (Save Variables File), in the CPU Unit. You can also read and
save arrays and structures. Data is created as shown below when the data of variable Var_A is placed
in an attached file in binary format.
• When you handle a binary file on the NJ-series CPU Unit, always specify the binary data type
with the type command before you read or write the file via FTP. (Refer to 9-5-2 Using the
Commands.)
• For details on how to use ladder diagram instructions to process files, refer to the NJ-series
Instructions Reference Manual (Cat. No. W502).
9-7-4 Format of Variable Data
Binary Format
Var_A
16#1234
16#4567
16#abcd
16#0987
12344567
abcd0987
Binary file
Variable values are
written to the binary
file in sequence
from the beginning.
SaveVar instruction
executed.
SD Memory Card
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