12
Maintenance and Inspection
12.3.3
LED Indicators
12-8
Errors
Not lit Not lit Not lit Lit Not lit
A serious error has occurred.
Refer to 12.4.3 Correcting User Pro-
gram Errors on page 12-13.
No lit Not lit Lit Not lit Not lit
Not lit Not lit Not lit
Blinking
Not lit
Software Error
Number of LED blinks indicates error
type.
3: Address error (read) exception
4: Address error (write) exception
5: FPU exception
6: Illegal general command
exception
7: Illegal slot command exception
8: General FPU inhibited exception
9: Slot FPU inhibited exception
10: TLB multibit exception
11: LTB error (read) exception
12: LTB error (write) exception
13: LTB protection volation (read)
exception
14: LTB protection volation (write)
exception
15: Initial page write exception
A hardware error has occurred.
Replace the Module.
Not lit Not lit
Blinking Blinking
Not lit
Hardware Error
Number of LED blinks indicates error
type.
2: RAM diagnostic error
3: ROM diagnostic error
4: CPU function diagnostic error
5: FPU function diagnostic error
Warnings
−− − −
Lit
Battery alarm
Refer to 12.2 Replacing the Basic
Module Battery on page 12-4 and
replace the Battery.
Lit Lit Lit Not lit Not lit
Operation error
I/O error
Refer to 12.4.4 ( 3 ) Ladder Program
User Operation Error Status on page
12-16 and 12.4.4 ( 5 ) System I/O
Error Status on page 12-18.
(cont’d)
Classification
LED Indicator
Indicator Details Countermeasures
RDY RUN ALM ERR BAT
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