29: TROUBLESHOOTING29-4 « FC4A MICRO SMART 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. Aftercompleting 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 possibleto stop operation and turn off outputs using the Function Area Settings on WindLDR. See page 5-3.Error Causes and Actions0001h: Power FailureThis error indicates when the power supply is lower than the specified voltage. This error is also recorded when the poweris turned off. Clear the error code using the HMI module or WindLDR on a computer.0002h: Watchdog Timer ErrorThe watchdog timer monitors the time required for one program cycle (scan time). When the time exceeds approximately293 msec, the watchdog timer indicates an error. Clear the error code using the HMI module or WindLDR on a computer. Ifthis error occurs frequently, the MicroSmart CPU module has to be replaced.0004h: Data Link Connection ErrorThis error indicates that the Function Area Settings for data link communication are incorrect or the cable is not connectedcorrectly. Make sure that slave stations are set to station numbers 1 through 31 using WindLDR. No duplication of stationnumbers 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, orconnect 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 ErrorThe user program stored in the MicroSmart CPU module EEPROM is broken. Download a correct user program to theMicroSmart, 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 ErrorThe execution data of timer/counter preset values is broken. The timer/counter preset values are initialized to the values ofthe user program automatically. Note that changed preset values are cleared and that the original values are restored. Clearthe error code using the HMI module or WindLDR on a computer.Error Items OperatingStatus Output ERR LED Checked atPower failure Stop OFF OFF Any timeWatchdog timer error Stop OFF ON Any timeData link connection error Stop OFF OFF Initializing data linkUser program EEPROM sum check error Stop OFF ON Starting operationTIM/CNT preset value sum check error Maintained Maintained OFF Starting operationUser program RAM sum check error Stop *1 OFF ON During operationKeep data error Maintained/Stop *2Maintained/OFF *2 OFF Turning power onUser program syntax error Stop OFF ON Downloading user programUser program writing error Stop OFF ON Downloading user programCPU module error Stop OFF ON Turning power onClock IC error Maintained Maintained ON Any timeI/O bus initialize error Stop OFF ON Turning power onUser program execution error Maintained Maintained ON Executing user program
