29: TROUBLESHOOTING
29-4 « FC4A MICROSMART USER’S MANUAL »
CPU Module Operating Status, Output, and ERR LED during Errors
*1: When a program RAM sum check error occurs, operation is stopped momentarily for reloading the user program. After
completing the reloading, operation resumes.
*2: Operation starts to run and outputs are turned on or off according to the user program as default, but it is also possible
to stop operation and turn off outputs using the Function Area Settings on WindLDR. See page 5-3.
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 the HMI module or 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
293 msec, the watchdog timer indicates an error. Clear the error code using the HMI module or WindLDR on a computer. If
this error occurs frequently, the MicroSmart CPU module has to be replaced.
0004h: Data Link Connection Error
This error indicates that the Function Area Settings for data link communication are incorrect or the cable is not connected
correctly. Make sure that slave stations are set to station numbers 1 through 31 using WindLDR. No duplication of station
numbers is allowed. See page 25-7.
To correct this error, make corrections in the Function Area Settings and download the user program to each station, or
connect the cable correctly. 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 25-11.
• Turn on special internal relay M8007 (data link communication initialize flag) at the master station. See page 25-6.
0008h: User Program EEPROM Sum Check Error
The user program stored in the MicroSmart CPU module EEPROM is broken. Download a correct user program to the
MicroSmart, and clear the error code using the HMI module or WindLDR on a computer.
When a memory cartridge is installed on the CPU module, the user program in the memory cartridge 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 changed preset values are cleared and that the original values are restored. Clear
the error code using the HMI module or WindLDR on a computer.
Error Items
Operating
Status
Output ERR LED Checked at
Power failure Stop OFF OFF Any time
Watchdog timer error Stop OFF ON Any time
Data link connection error Stop OFF OFF Initializing data link
User program EEPROM sum check error Stop OFF ON Starting operation
TIM/CNT preset value sum check error Maintained Maintained OFF Starting operation
User program RAM sum check error Stop *1 OFF ON During operation
Keep data error
Maintained/
Stop *2
Maintained/
OFF *2
OFF Turning power on
User program syntax error Stop OFF ON Downloading user program
User program writing error Stop OFF ON Downloading user program
CPU module error Stop OFF ON Turning power on
Clock IC 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
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