13
F3SJ-B
User’s Manual
Chapter2 Description of Functions
System Configuration and Functions
E
Self-test Function
The F3SJ-B performs the self-test when power is turned ON (within 2 seconds) to check for errors.
Also, it regularly performs the self-test (within a response time) while operating.
This function cannot be cancelled.
If an error is found in the self-test, the F3SJ-B enters lockout state, keeps the safety output in the OFF
state, and indicates the error at the same time.
Self-test details
The self-test detects the types of errors described below.
Emitter
• Failure of emitter element or circuit
• CPU failure
• Disconnected or short-circuited cable
Receiver
• Abnormal external power supply voltage
• Failure of internal power supply circuit
• Failure of receiver element or detection circuit
• CPU failure
• Memory failure
• Incidence of disturbance light
• Failure of safety output circuit
• Disconnected or short-circuited cable
Waveform of safety outputs
When the F3SJ-B is receiving light, the safety outputs cyclically turn OFF as shown below to test the
output circuit. When this OFF signal is fed back, the output circuit is diagnosed as normal. If the output
signal does not include an OFF pulse signal due to short-circuit, etc, the receiver diagnoses a failure in
the output circuit or wiring, and it enters lockout state.
Subsequently performs periodic test
Power supply
ON
OFF
Self test
ON
OFF
2 s max.
ON
OFF
Safety output 1
Approx. 15 to 30 ms
ON
OFF
Safety output 2
Approx.
7.5 to 15 ms
Approx. 40 μs max. *
Approx. 15 to 30 ms
* An OFF pulse signal of safety output may extend to a maximum of about 100μs
due to the effect of the connected load (mostly capacitive load).
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