Compact Type 4 Safety Beam Sensor ST4

Circuit/ Wiring

I/O Circuit and Wiring diagrams

In case of PNP output
・Set the output polarity selection switch to the PNP side.

Notes:

1)	The left diagram is when using manual reset. If automatic reset is used, disconnect the lead from X2 and connect it to X3. In this case, a reset (RESET) button is not needed.
2)	Use a momentary-type switch as the reset (RESET) button.
3)	Emission halt input is for stopping emission when open, and emitting when short-circuited. If not using the test button, short-circuit T1 and T2.
KA, KB:	Force-guided relay or magnetic contactor

In case of NPN output
・Set the output polarity selection switch to the NPN side.

Notes:

1)	The left diagram is when using manual reset. If automatic reset is used, disconnect the lead from X2 and connect it to X3. In this case, a reset (RESET) button is not needed.
2)	Use a momentary-type switch as the reset (RESET) button.
3)	Emission halt input is for stopping emission when open, and emitting when short-circuited. If not using the test button, short-circuit T1 and T2.
KA, KB:	Force-guided relay or magnetic contactor

Terminal arrangement diagram

Terminal	Description
IL+	Interference prevention terminals
IL-	Interference prevention terminals
IU+	Interference prevention terminals
IU-	Interference prevention terminals
X1	Reset input terminals (When X1 and X2 are connected: manual reset, and when X1 and X3 are connected: auto reset)
X2
X3
T1	Emission halt input terminals (Open: emission halt, Short-circuit: emission)
T2
AUX	Negative logic of the control outputs (OSSD1, OSSD2)
OSSD1	Control outputs (OSSD1, OSSD2)
OSSD2	Control outputs (OSSD1, OSSD2)
A1	24V DC
A2	0V

In case of PNP output
・Set the output polarity selection switch to the PNP side.

Notes:

1)	The left diagram is when using manual reset. If automatic reset is used, disconnect the lead from X2 and connect it to X3. In this case, a reset (RESET) button is not needed.
2)	Use a momentary-type switch as the reset (RESET) button.
3)	Emission halt input is for stopping emission when open, and emitting when short-circuited. If not using the test button, short-circuit T1 and T2.
KA, KB:	Force-guided relay or magnetic contactor

In case of NPN output
・Set the output polarity selection switch to the NPN side.

Notes:

1)	The left diagram is when using manual reset. If automatic reset is used, disconnect the lead from X2 and connect it to X3. In this case, a reset (RESET) button is not needed.
2)	Use a momentary-type switch as the reset (RESET) button.
3)	Emission halt input is for stopping emission when open, and emitting when short-circuited. If not using the test button, short-circuit T1 and T2.
KA, KB:	Force-guided relay or magnetic contactor

Terminal arrangement diagram

Terminal	Description
S+	Muting input power supply (24 V)
S-A	Muting input S-A [For NO (nomally open) contact or PNP output type sensor]
S-B	Muting input S-B [For NO (nomally open) contact or NPN output type sensor]
S-	Muting input power supply (0 V)
S+	Muting input power supply (24 V)
S-C	Muting input S-C [For NO (nomally open) contact or PNP output type sensor]
S-D	Muting input S-D [For NO (nomally open) contact or NPN output type sensor]
S-	Muting input power supply (0 V)
S+	Muting input power supply (24 V)
S-E	Muting input S-E [For NO (nomally open) contact or PNP output type sensor]
S-F	Muting input S-F [For NO (nomally open) contact or NPN output type sensor]
S-	Muting input power supply (0 V)
AUX1	Auxiliary output 1 (muting function)
AUX2	Auxiliary output 2 (override function)
AUX3	Auxiliary output 3 (muting lamp shutoff)
AUX4	Negative logic of the control outputs (OSSD1, OSSD2)
OSSD1	Control outputs (OSSD1, OSSD2)
OSSD2	Control outputs (OSSD1, OSSD2)
L1	Muting lamp connecting terminal
L2	Muting lamp connecting terminal
A1	24V DC
A2	0V
IL+	Interference prevention terminals
IL-	Interference prevention terminals
IU+	Interference prevention terminals
IU-	Interference prevention terminals
O1	Override input terminals
O2	Override input terminals
X1	Reset input terminals (When X1 and X2 are connected: manual reset, and when X1 and X3 are connected: auto reset)
X2
X3
T1	Emission halt input terminals (Open: emission halt, Short-circuit: emission)
T2