1
ISK 70-755 Inductive Safety �elay
Inductive Safety �elay
�elay
Figure 1: Connection at the coil core
SCE
CLOSING
movemen
t
SCE
OPENING
movemen
t
O
C
English
9. Connecting the sensors
9.1 Connecting to the SPK 54 coil core
(fig. 1)
ASO sensors must not be connected in parallel.
9.2 Connecting multiple sensors per sensor circuit
(fig. 2)
One or �ore sensors can be connected to sensor input
O
or
C
. For this purpose, the individual sensors are
connected in series according to figure 2.
Up to five SCE �a�� be connected in series. The �axi�u� total length oft the SCE shall not exceed 100 �.
The length o� one SCE �a�� be up to 25 �. The total cable length oft the in series connected SCE �ust not
exceed 25 �.
Be�ore connecting the sensors that are connected in series, it is reco��ended that the resistance value o�
the arrange�ent be �easured.
The resistance �ust be 8.2 kΩ ± 500Ω when the SCE is inactive and �ust not exceed 500Ω when it is active.
Ω ± 500Ω when the SCE is inactive and �ust not exceed 500Ω when it is active.
± 500 Ω when the SCE is inactive and �ust not exceed 500Ω when it is active.
Ω when the SCE is inactive and �ust not exceed 500Ω when it is active.
when the SCE is inactive and �ust not exceed 500 Ω when it is active.
Ω when it is active.
when it is active.
I� a channel is not used, it �ust be connected to an 8.2k
kk
Ω
resistor
The travelling edges (SCE) are connected to the travelling
coil core.
For this purpose, the travelling SCE
CLOSING
�ove�ent
is connected to connection
C
o� the travelling coil core
and the optional SCE
OPENING
�ove�ent is connected
to connection
O
Figure 1: Wiring of multiple sensors; in this example: safety contact edge
After appl��ing the test signal, the control output �ust deactivate. This change in switching state �ust be
evaluated b�� the pri�ar�� �achine control. I� the test result is correct, the �achine control then initiates
the �ove�ent or the next work step. Otherwise, the controller �ust output an error �essage and prevent
a dangerous �ove�ent.
I� the �achine control detects an error �ault in the sa�et�� device, the �achine control �ust �aintain a sa�e
state until the error is rectified.
Without testing, the operation o� the device satisfies no specific sa�et�� require�ent.
Sensor 1
Sensor 2
Sensor „n“
O
C
2
2
2
2
