App-272
(20) Data logging
Number Name Meaning Explanation
Set by
(When Set)
Correspo
nding
ACPU
D9
Corresponding
CPU
SD1940
Data logging
setting No.1
Latest file No.
Latest file No.
This register stores the latest file number.
This register is cleared to "0" by a stop
command from LCPU Logging Configuration
Too l.
S
(Status
change)
New LCPU
SD1941
SD1942
Data logging
setting No.1
Oldest file No.
Oldest file No.
This register stores the oldest file number.
This register is cleared to "0" by a stop
command from LCPU Logging Configuration
Too l.
SD1943
SD1944
Data logging
setting No.1
Free buffer space
Free buffer space
This register stores free buffer space (unit: 1K
byte).
If the value is small, processing overflow may
occur.
For trigger logging, this register stores the
buffer size until when data are collected by
the number of records after trigger.
This register is cleared to "0" by a stop
command from LCPU Logging Configuration
Too l.
SD1945
Data logging
setting No.1
Processing
timeout count
Number of times
processing overflow
occurred
This register stores the number of times that
data logging processing overflow occurred.
If an overflow occurs, some data may not be
collected. When the storage value reaches to
65535, count is resumed from "0".
If Stop is specified for Operation occurring
when number of saved files is exceeded,
processing overflow may occur from when
data collection by the number of specified
storage files is completed and until when data
logging is stopped. This register is cleared to
"0" by the registration of the setting or a stop
command from LCPU Logging Configuration
Too l.
S
(Error)
SD1946
Data logging
setting No.1
Data logging error
cause
Data logging error
cause
This register stores the cause of an error that
occurred during data logging.
•0: No error
•Other than 0: For values stored at
error occurrence, refer
to the errors that
occurs in data logging
described in the
following.
( MELSEC-L
CPU Module User's
Manual (Data Logging
Function))
This register is cleared to "0" by the
registration of the setting or a stop command
from LCPU Logging Configuration Tool.
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