F3S-B
9
External Test
If your application requires periodic testing more
often than every 2 seconds an external control
system is able to initiate an external test with the
External test function. If a signal of 17 VDC to Vs
is applied to the External test input at least 15 ms,
a self-test starts and the outputs turn to the OFF-
state in 15 ms. If no failure is detected, the outputs
return to the ON-state after a maximum of 150 ms.
Failure detection and restoration
When a failure is detected through the tests above, the F3S-B keeps the outputs in the OFF-state and the
indicators show the type of failure, refer to section “8 Troubleshooting”. After the failure is eliminated, in
most cases the F3S-B operation will be restored automatically.
1-3-3 Instability Output
When the received light is insufficient, the instability output and the instability indicator turn ON. In normal
operation, both are OFF. See also “1-8 Indicators”.
This output makes it possible for customers to monitor deterioration of optical performance due to aging or
other factor, such as reduction of LED power, misalignment between the emitter and receiver, or dust on
the lens.
Also, when a failure is detected, or the F3S-B is
connected with the F39-E1 interface unit, the
instability output turns ON as well.
Note:
After the power is turned ON, the instability
output goes to the ON-state for approxi-
mately 150 ms as shown in the timing chart
for Interlock mode selection.
1-4 Optional Functions
These functions can be activated by the optional function software, F39-U1E (see the F39-U1E manual for
detailed information).
Note:
The F39-U1E Optional Function Software is used with the F39-E1 Interface Unit, a PC (running
Microsoft
Windows
95, Windows
98 or Windows NT
)
, the F39-JB1C Interface Cable, and a RS-
232C cable.
1-4-1 Start Interlock
When the Start interlock function is used, the F3S-B does not go to the ON-state automatically after power
ON. Interrupting one or more axes resets the start interlock condition, so the F3S-B can start normal op-
eration.
1-4-2 Relay Monitoring
MPCEs (Machine Primary Control Elements) are usually relays or contactors used to control hazardous
movement directly. The state of the MPCEs can be checked with the Relay monitoring function.
A voltage of 17 VDC to Vs has to be applied to the Relay monitoring input through the NC contacts of the
MPCEs when the F3S-B control outputs are in the OFF-state (see “2-3-2 Wiring diagram”). To ensure this
logic relation, the MPCEs must be safety approved types, with forcibly guided contacts.
1-4-3 Blanking
With this function, one or more axes can be disabled. To select the blanking axes, a manual setting func-
tion or teaching function is available. This function is useful when part of the F3S-B detection zone is inter-
rupted.
External test
input
Control
outputs
H
H
L
(open)
L
(open)
> 15 ms
Approx. 15 ms
150 ms max.
Power
supply
Instability
output
H
H
L
L
Approx.
150 ms
Approx.
30 ms
2 s max.
(Startup waiting time) F3S-B available
