27: TROUBLESHOOTING
27-4 OPENNET CONTROLLER USER’S MANUAL
OpenNet Controller Operating Status, Output, and ERROR LED during Errors
*1: When the power voltage to the OpenNet Controller CPU module drops below the rated value, the ERROR LED is lit. While
the power voltage remains below the rated value, the ERROR LED does not go on.
*2: When a program RAM sum check error occurs, operation is stopped momentarily for recompiling the user program. After
completing the recompilation, operation resumes.
*3: Outputs where error occurs are turned off, and restore normal operation when the cause of error is removed.
Error Causes and Actions
0001h: Power Failure
This error indicates when the power supply is lower than the specified voltage. This error is also recorded when the power
is turned off. Clear the error code using WindLDR on a computer.
0002h: Watchdog Timer Error
The watchdog timer monitors the time required for one program cycle (scan time). When the time exceeds approximately
1.68 seconds, the watchdog timer indicates an error. Clear the error code using WindLDR on a computer. If this error occurs
frequently, the OpenNet Controller CPU module has to be replaced.
0004h: Data Link Connection Error
This error indicates that data link station numbers are incorrect. Make sure that the communication selector DIP switches
are set to station number 0 at the master station and to station numbers 1 through 31 at slave stations. No duplication of
station numbers is allowed. See page 21-2.
To correct this error, change the communication selector DIP switch setting to 0 at the master station and to 1 through 31
at slave stations. Turn power off and on again for the slave station. Then take one of the following actions:
• Turn power off and on for the master station.
• Initialize data link communication for the master station using WindLDR on a computer. See page 21-11.
• Turn on special internal relay M8007 (data link communication initialize flag) at the master station. See page 21-6.
0008h: User Program ROM Sum Check Error
The user program stored in the OpenNet Controller CPU module ROM is broken. Download a correct user program to the
OpenNet Controller, and clear the error code using WindLDR on a computer.
When a memory card is installed in the CPU module, the user program in the memory card is checked.
0010h: Timer/Counter Preset Value Sum Check Error
The execution data of timer/counter preset values is broken. The timer/counter preset values are initialized to the values of
the user program automatically. Note that modified preset values are cleared and that the original values are restored. Clear
the error code using WindLDR on a computer.
Error Items
Operating
Status
Output ERROR LED Checked at
Power failure Stop OFF ON *1 Any time
Watchdog timer error Stop OFF ON Any time
Data link connection error Stop OFF OFF Initializing data link
User program ROM sum check error Stop OFF ON During operation
TIM/CNT preset value sum check error Maintained Maintained OFF Starting operation
User program RAM sum check error Stop *2 OFF ON Starting operation
Keep data sum check error Maintained Maintained OFF Turning power on
User program syntax error Stop OFF ON Downloading user program
User program writing error Stop OFF ON Downloading user program
Protect output overload error Maintained Maintained *3 ON During operation
Calendar/clock error Maintained Maintained ON Any time
I/O bus error Stop OFF ON Any time
INTERBUS master access error Maintained Maintained ON Any time
I/O bus initialize error Stop OFF ON Turning power on
User program execution error Maintained Maintained ON Executing user program
Phone: 800.894.0412 - Fax: 888.723.4773 - Web: www.clrwtr.com - Email: info@clrwtr.com
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