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Troubleshooting
122
Doc No: UMAN\FL\0110
Rev. No.: 1.02B
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 calender error
b. Retentive Data Loss error
For Clock calender 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:
No. Event
Info1
Info 2
Info 3
Info 4 Special
Meaning and
Check at
Device
countermeasures
1
Retentive
MW01_6
In the power-up initialization,
Only Power-On
Data Loss
data invalidity of RAM (back-
Error
up area) has been detected.
If retentive registers are used,
these validity are not guarant-
eed. (No error down)
2
Clock-cal-
MW01_5
The data of built-in calendar
Only Power-On
endar error
LSI is illegal.(No error down)
Set the date and time.
4
I/O
slot
Unit
MW01_1
The I/O allocation information
Only Power-On
mismatch
No.
Type
MW01_13
and the actual I/O configuration
are not identical.(Error down)
Check the I/O allocation and
the option card mounting status
5
I/O BCC
Unit
Register
MW01_1
I/O bus parity error has been
Each main loop
error
No.
No.
MW01_15
detected in data read/write for
scan
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.