Self-Test Function - Omron F3SJ-E N25 Series User Manual

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Self-test Function

Easy Type
Basic Type (basic system)
Basic Type (muting system)
The F3SJ-E/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.
ON
Power supply
OFF
ON
Self test
OFF
If an error is found in the self-test, the F3SJ-E/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-E/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.
Safety output 1
Safety output 2
* 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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2 s max.
Subsequently performs periodic test
Approx. 15 to 30 ms
OFF
ON
Approx.
Approx. 15 to 30 ms
7.5 to 15 ms
OFF
ON
System Configuration and Functions
Approx. 40 μs max. *
E
F3SJ-E/B
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User's Manual