27: TROUBLESHOOTING
OPENNET CONTROLLER USER’S MANUAL 27-3
Special Data Registers for Error Information
Three data registers are assigned to store information on errors.
General Error Codes
The general error code is stored in special data register D8005 (general error code).
When monitoring the PLC status using WindLDR, the error code is displayed in the error code box under the Error Status
in the PLC Status dialog box using four hexadecimal digits 0 through F. Each digit of the error code indicates a different
set of conditions requiring attention. After the error code is cleared as described on the preceding page, the error code box
is left blank.
For example, the error code may read out “0021.” This indicates two conditions requiring attention, “User program sum
check error” from the third chart and “Power failure” from the fourth chart. If the read-out displays “000D,” this indicates
three conditions exist from only the fourth chart.
D8005 General Error Code
D8006 User Program Execution Error Code
D8007 User Program Execution Error Address
Error Code: Most Significant Digit
F000 E000 D000 C000 B000 A000 9000 8000 7000 6000 5000 4000 3000 2000 1000 0000
INTERBUS master access error X X
I/O bus initialize error XX
Error Code: 2nd Digit from Left
F00 E00 D00 C00 B00 A00 900 800 700 600 500 400 300 200 100 000
User program writing error XXXXXXXX
Protect output overload error X X X X X X X X
Calendar/clock error XXXX XXXX
I/O bus error XXXXXXXX
Error Code: 3rd Digit from Left
F0 E0 D0 C0 B0 A0 90 80 70 60 50 40 30 20 10 00
TIM/CNT preset value sum check error XXXXXXXX
User program RAM sum check error X X X X X X X X
Keep data sum check error XXXX XXXX
User program syntax error XXXXXXXX
Error Code: Least Significant Digit
FEDCBA9876543210
Power failure XXXXXXXX
Watchdog timer error X X X X X X X X
Data link connection error XXXX XXXX
User program ROM sum check error XXXXXXXX
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