USER’S MANUAL 18-1
18: TROUBLESHOOTING
Introduction
This chapter describes the procedures to determine the cause of trouble and actions to be taken when any trouble occurs
during operating the MICRO
3
programmable controller.
MICRO
3
has self-diagnostic functions to prevent the spread of troubles if any trouble should occur. In case of any trouble,
follow the troubleshooting procedures to determine the cause and to correct the error.
Error Indicators ERR1 and ERR2
The MICRO
3
base unit has two error indicators: ERR1 and ERR2.
When an error occurs in the MICRO
3
base unit, error indicator ERR1
is lit. In addition, when the sensor power supply from the MICRO
3
base unit is overloaded, error indicator ERR2 is lit. See the trouble
shooting diagrams on pages 18-9 and 18-10.
For error causes to turn ERR1 and ERR2 on, see page 18-2.
Reading Error Data
When any error occurs during the MICRO
3
operation, the error codes and messages can be read out using FUN20 on the
program loader.
Error Messages
When operating FUN20, the following error messages may be displayed.
Note: When the error code is cleared using the program loader as described above, the error data on the user program syn-
tax error (Syntax), advanced instruction syntax error (ADV Error), user program execution error (RUN Error), and link
communication error (COM Error) is cleared from memory. To read the error code again before removing the cause of the
error, power up the MICRO
3
or transfer the user program to the MICRO
3
again, then operate FUN20.
Error Message Error Code Error Status
Power Off 1h Power failure
Watch Dog Time 2h Watch dog timer error
PC Connect NG 4h Data link connection error
Users Prg. CRC 8h User program CRC error
TIM/CNT CRC 10h Timer/counter preset value CRC error
Prg. Sum Check 20h User program sum check error
Keep Data Sum 40h Keep data sum check error
Syntax 80h User program syntax error
EEPROM NG 100h User program writing error
Transistor NG 200h Protect output overload error
24V Overload 400h Sensor power overload error
Calendar NG 800h Calendar/clock error
ADV Error ( ) —— Advanced instruction syntax error
RUN Error ( ) —— User program execution error
COM Error ( ) —— Link communication error
100-240V AC
LN
DC OUT
24V 0V
DC IN
COM
01
IN
0
123456710
OUT0123456
POW RUN ERR1 ERR2
Error indicator ERR1
Error indicator ERR2
FUN 20 ERROR 2C0
Syntax0070015
Keep Data Sum
Transistor NG
: Next page exists. To view the next page, press the key.
: Preceding page exists. To view the preceding page, press the key.
FUN
2
BRD
0
Total of General Error Codes
Error Messages
ADV Error, RUN Error, and COM Error
are displayed on the same page.
FUN 20 ERROR 80
ADV Error( 4)
RUN Error( 0)
COM Error( 0)
After removing cause of the error, clear
error code using the program loader.
FUN 20 ERROR
Nothing
DEL
The error indicator remains on until
the cause of the error is removed.
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