A-131
Appendices
CJ2 CPU Unit Software User’s Manual
A-3 Auxiliary Area
App
A-3-1 Read-only Area (Set by System)
A339
and
A340
--- Maximum Differ-
entiation Flag
Number
These words contain the maximum value of the differentiation flag
numbers being used by differentiation instructions.
See Func-
tion col-
umn.
Cleared Written at the start
of operation
A295.13
A343 A343.00
to
A343.02
Memory Card
Typ e
Indicates the type of Memory Card, if any, installed.
0: None
4: Flash ROM
This information is recorded when the PLC power is turned ON or
the Memory Card power switch is turned ON.
Retained See
Function
column.
See Function col-
umn.
A343.06 EM File Memory
Format Error
Flag
ON when a format error occurs in the first EM bank allocated for
file memory.
ON: Format error
OFF: No format error
The flag is turned OFF when formatting is completed normally.
Retained Cleared ---
A343.07 Memory Card
Format Error
Flag
ON when the Memory Card is not formatted or a formatting error
has occurred. (The flag is turned OFF when formatting is com-
pleted normally.)
ON: Format error
OFF: No format error
This flag is written when the PLC power is turned ON or the Mem-
ory Card power switch is turned ON.
Retained See
Function
column.
See Function col-
umn.
A343.08 File Transfer
Error Flag
ON when an error occurred while writing data to file memory.
ON: Error
OFF: No error
Retained Cleared Refreshed when file
data is written.
A343.09 File Write Error
Flag
ON when data cannot be written to file memory because it is
write-protected or the data exceeds the capacity of the file mem-
ory.
ON: Write not possible
OFF: Normal condition
Retained Cleared Refreshed when file
data is written.
A343.10 File Read Error ON when a file could not be read because of a malfunction (file is
damaged or data is corrupted).
ON: Read not possible
OFF: Normal condition or read processing is being executed
Retained Cleared Refreshed when file
data is read.
A343.11 File Missing Flag ON when an attempt is made to read a file that does not exist, or
an attempt is made to write to a file in a directory that does not
exist.
ON: Specified file or directory is missing
OFF: Normal condition or read processing is being executed
Retained Cleared Refreshed when file
data is read.
A343.13 File Memory
Operation Flag
ON while any of the following operations is being executed. OFF
when none of them are being executed.
CMND instruction sending a FINS command to the local CPU
Unit.
Execution of a File Memory instruction.
Program replacement using the control bit in the Auxiliary Area.
Easy backup operation.
ON: Instruction being executed.
OFF: Instruction not being executed.
Retained Cleared Refreshed when file
memory instruction
is executed.
A343.14 Accessing File
Data Flag
ON while file data is being accessed.
ON: File being accessed
OFF: File not being accessed
Use this flag to prevent two file memory instructions from being
executed at the same time.
Retained Cleared ---
A343.15 Memory Card
Detected Flag
ON when a Memory Card has been detected.
OFF when a Memory Card has not been detected.
ON: Memory Card detected
OFF: Memory Card not detected
Retained Cleared Refreshed when
Memory Card is
inserted, or the
power is turned ON.
Address
Name Function
Status
after mode
change
Status at
startup
Write timing/
Related flags, set-
tings
Words Bits
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