KEYENCE SL-V Series - Manual (Page 28)

2-4
Fu
nct
ion
s and
Feat
ures
2
SL-V-M-NO2-E
2-2
Self-diagnosis Function
The SL-V performs self-diagnosis for approx. 4.5 seconds after the power is turned on and checks for
errors in the SL-V. Self-diagnosis is also performed periodically during normal operations.
If the self-diagnosis function detects an error, the SL-V goes to Lockout condition and the OSSD is kept in
OFF state even if no interruption exists in the detection zone. The indicators operate in the following man-
ner during lockout condition.
Bar LED : Indication corresponding to the cause of the error
See "Troubleshooting" (page A-2)
Function indicator : Interlock indicator is blinking in yellow.
See "Function Indicators" (page 6-5)
Center indicators : All indicators are blinking in red.
See "Center Indicator" (page 6-6)
To release the lockout condition, first remove the cause of the error, and then either activate reset input or
turn the power off and on again.
See "Time chart for the termination of lockout condition due to reset input" (page 2-13)

Self-diagnosis description

Transmitter
• Error in external power supply voltage
• Failure in internal power supply circuit
• Failure in light emitting element and light receiving circuit
• CPU overdrive
• Memory error
• Cable open/short-circuit

Receiver
• Error in external power supply voltage
• Failure in internal power supply circuit
• Failure in light receiving element and detection circuit
• CPU overdrive
• Memory error
• Failure in safety output circuit (OSSD)
• Cable open/short-circuit
• Program monitoring
Lockout condition