Filter
Top Products
Page 123
No.
Event Info1 Info 2 Info 3 Info 4
Special
Device
Meaning and
countermeasures
Check at
1
Retentive
Data Loss
Error
MW01_6
In the power-up initialization,
data invalidity of RAM (back-
up area) has been detected.
If retentive registers are used,
these validity are not guarant-
eed. (No error down)
Only Power-On
2
Clock-cal-
endar error
MW01_5
The data of built-in calendar
LSI is illegal.(No error down)
Set the date and time.
Only Power-On
4
I/O
mismatch
slot
No.
Unit
Type
MW01_1
MW01_13
The I/O allocation information
and the actual I/O configuration
are not identical.(Error down)
Check the I/O allocation and
the option card mounting status
Only Power-On
5
I/O BCC
error
Unit
No.
Register
No.
MW01_1
MW01_15
I/O bus parity error has been
detected in data read/write for
I/O modules. An abnormality
has been detected in I/O bus
checking. (Error down)I/O No
answer. (Error down) Check
the expansion cable connect-
ion and the I/O module
mounting
status.
Each main loop
scan
The errors in the PLC can be categorized as below:
1. CPU error:
a. System watchdog Reset (WDT Error)
If there is error in this category the CPU error flag ( MW01_0 device) sets along with corresponding device of
the error. So for
WDT
error MW01_11 device sets.
2. I/O Error:
a. I/O mismatch error
b. I/O bcc error.
If there is error in this category the I/O error flag ( MW01_1 device) sets along with corresponding device of
the error. So for I/O mismatch error MW01_13 device sets and for I/O bcc error MW01_15 device sets.
3. Program Error:
a. Scan Time Over error
If there is error in this category the I/O error flag ( MW01_2 device) sets along with corresponding device of
the error. So for Scan Time Over error MW02_1 device.
4. Other Errors:
a. Clock calendar error
b. Retentive Data Loss error
For Clock calendar error MW01_5 device sets and for Retentive Data Loss error MW01_6 device sets
Above error conditions are checked either in each main loop scan or only at power up. This is mentioned in the
following table.
The configuration devices (M) and configuration registers (MW) are used for special purposes.
Error Messages and related information: