Mitsubishi MELSEC Q Series Programming Manual page 1280

(20) Data logging
Number Name
SD1940
Data logging
setting No.1
SD1941
Latest file No.
SD1942
Data logging
setting No.1
SD1943
Oldest file No.
Data logging
SD1944 setting No.1
Free buffer space
Data logging
setting No.1
SD1945
Processing
timeout count
Data logging
setting No.1
SD1946
Data logging error
cause
App-272
Meaning
This register stores the latest file number.
This register is cleared to "0" by a stop
Latest file No.
command from LCPU Logging Configuration
Tool.
This register stores the oldest file number.
This register is cleared to "0" by a stop
Oldest file No.
command from LCPU Logging Configuration
Tool.
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
Free buffer space
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
Tool.
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
Number of times
when number of saved files is exceeded,
processing overflow
processing overflow may occur from when
occurred
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
Tool.
This register stores the cause of an error that
occurred during data logging.
Data logging error
cause
This register is cleared to "0" by the
registration of the setting or a stop command
from LCPU Logging Configuration Tool.
Explanation
•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))
Correspo
nding
Set by Corresponding
ACPU
(When Set)
D9
S
(Status
change)
New
S
(Error)
CPU
LCPU