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Manipulating Files Section 5-2
2. Execution of CMND(490) to send a FINS command to the CPU Unit itself
3. Replacement of the entire program by Auxiliary Area control bit operations
4. Execution of a simple backup operation
Use the File Memory Operation Flag (A34313) for exclusive control of file
memory instructions to prevent them from being executed while another file
memory operation is in progress.
When FREAD(700) is being executed, the File Read Error Flag (A34310) will
be turned ON and the instruction won’t be executed if the specified file con-
tains the wrong data type or the file data is corrupted. For text or CSV files,
the character code must be hexadecimal data and delimiters must be posi-
tioned every 4 digits for word data and every 8 digits for double-word data.
Data will be read up to the point where an illegal character is detected.
Related Auxiliary Bits/Words
Name Address Operation
Memory Card Type A34300 to
A34302
Indicates the type of Memory Card, if any, that is
installed.
EM File Memory For-
mat Error Flag
A34306 ON when a format error occurs in the first EM
bank allocated for file memory. OFF when format-
ting is completed normally.
Memory Card For-
mat Error Flag
A34307 ON when the Memory Card is not formatted or a
formatting error has occurred.
File Write Error Flag A34308 ON when an error occurred when writing to the
file.
File Write Impossi-
ble Flag
A34309 ON when the data couldn’t be written because the
file was write-protected or there was insufficient
free memory.
File Read Error Flag A34310 ON when a file could not be read because its data
was corrupted or if it contains the wrong data type.
No File Flag A34311 ON when data could not be read because the
specified file doesn’t exist.
File Memory Opera-
tion Flag
A34313 ON for any of the following:
The CPU Unit is processing a FINS command
sent to itself using CMND(490).
FREAD(700) or FWRIT(701) is being executed.
The program is being overwritten using an Auxil-
iary Area control bit.
A simple backup operation is being performed.
Accessing File Flag A34314 ON when file data is actually being accessed.
Memory Card
Detected Flag
A34315 ON when a Memory Card has been detected.
(Not supported by CS-series CS1 CPU Units that
are pre-EV1)
Number of Items to
Transfer
A346 to
A347
These words indicate the number of words or
fields remaining to be transferred (32 bits).
When a binary (.IOM) file is being transferred, this
number is decremented each time a word is read.
When a text or CSV file is being transferred, this
number is decremented each time a field is trans-
ferred.
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