Chapter 7 Troubleshooting
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7.2 Trouble Details Checks
You can use the controller status display LED and nV-Tool log information about the
controller in order to check the trouble occurring in the controller.
■
Checks with the controller module's controller status display LEDs
When the RUN or ERR LED of the controller front panel remains stopped in one of the
cases listed in Table 7-1, this indicates that an error has occurred. RUN or ERR LED
indication shows the error details.
Table 7-1 LED indication and error details
RUN or ERR LED
Error
Action
RUN or ERR LED blinks every time.
CPU computation error
Power off the controller
unit and then turn it on
again. If the failure still
remains, replace the
controller module.
ERR LED blinks once →
RUN or ERR LED blinks more once.
Boot are an error
ERR LED blinks twice →
RUN or ERR LED blinks more once.
OS program RAM error
ERR LED blinks three times →
RUN or ERR LED blinks more once.
OS work RAM error
ERR LED blinks four times →
RUN or ERR LED blinks more once.
FROM ID error
ERR LED blinks five times →
RUN or ERR LED blinks more once.
OS program BCC error
ERROR LED lights up.
Error down
Use nV-Tool to check the
failure condition.
■
Checks with the nV-Tool error logs
Error log appears according to the following procedures, which assumes that an external
power failure of the I/O module occurred during operation:
Connect the controller and nV-Tool using an Ethernet cable.
Start nV-Tool.
From the nV-Tool product tree, select the system and station you want to
view.
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