Manual

13: TROUBLESHOOTING
13-4 WEB SERVER CPU MODULE USER’S MANUAL FC9Y-B1278
CPU Module Operating Status, Output, and ERR LED during Errors
Note 1: When a program RAM sum check error occurs, operation is stopped momentarily for reloading the user program. After
completing the reloading, operation resumes.
Note 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 "Run/Stop Selection at Memory Backup Error" of the
basic volume (page 5-3).
Note 3: Memory cartridge program transfer error bit is available on FC5A-D12K1E and FC5A-D12S1E only.
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 400 ms, the
watchdog timer indicates an error. Clear the error code using the HMI module or WindLDR on a computer. If 400 ms is
too small, the watchdog timer value can be increased in the Function Area Settings. For details, see “Watchdog Timer
Setting” on page 5-3
. If this error occurs frequently, the Web server 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 "Programming WindLDR" of the basic volume (page 11-8)
.
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 "Operating Procedure for Data Link
System" of the basic volume (page 11-12).
• Turn on special internal relay M8007 (data link communication initialize flag) at the master station. See "Special Internal Relays
for Data Link Communication" of the basic volume (page 11-7).
0008h: User Program ROM Sum Check Error
The user program stored in the Web server CPU module EEPROM is broken. Download a correct user program to the
Web server CPU module, and 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 ROM 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 (Note 1) OFF ON During operation
Keep data error
Maintained/
Stop (Note 2)
Maintained/OFF
(Note2)
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
Memory cartridge program transfer error
(Note 3)
Stop OFF ON Turning power on
I/O bus initialize error Stop OFF ON Turning power on
User program execution error Maintained Maintained ON Executing user program