5. Safety-related function
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i. -|Transparent setting guide|-
5.4.2.1 When using two muting sensors in exit-only mode
(1) Wiring
NPN output
PNP output
(Brown)+24VDC
(Pink)Mute 2 input
(Orange)Mute 1 input
S2
S1
(Blue)0V
Emitter
(Brown)+24VDC
(Pink)Mute 2 input
(Orange)Mute 1 input
(Blue)0V
S2
S1
Emitter
※
Muting sensors (S1, S2) have the same output type (NPN, PNP) and 3-wire transistor output.
Use sensors that output is ON when detecting an object, and operate in Dark ON mode.
※
In case of SFL (standard type), use the muting sensors with N.O. contact.
In case of SFLA (advanced type), use atLightCurtain to set N.O. or N.C. contact based on the output type of muting sensor.
(2) Example of exit-only muting function
While a workpiece is passing through the detection zone from the safety zone to the hazardous zone, muting begins by
signals from two muting sensors installed parallel.
•
Installation example
Muting sensors (S1, S2): Through-beam photoelectric sensor (Output is ON when sensing the object, Dark ON mode)
Muting sequence: Mute input 1 → 2
Item
Unit
Description
L
m
Length of the object
V
m/s
Velocity of the object
D1
m
Distance between the muting sensors labeled S1/S2
D2
m
Distance between the muting sensor labeled S1 and product
T1min
sec
Min value of mute Input time limit (T1)
T1max
sec
Max value of mute Input time limit (T1)
※
If mute 2 input is applied within mute input time limit (T1) after mute 1 input is applied, the muting starts.
(T1min <(D1 / V) <T1max)
※
Be sure to maintain the muting condition after the detection object passes through the muting sensor and
the detection zone. The following formula must be satisfied. ((D2/V) < T3)
Order Example of operation
(
●
: ON,
●
: OFF)
①
Safety zone
Hazardous zone
L
D2
Emitter
Receiver
S1
S2
D1
Workpiece
V
●
(OFF)
●
(OFF)
The muting sensors (S1, S2) are in OFF state before the workpiece passes.
The muting condition does not start and sensing function is activated.
※ : Install the muting sensors located in a hazardous zone to prevent starting the
muting by an operator.
Mute 1 input
●
S1
●
Mute 2 input
●
S2
●
