Protecting
short
and input power
Protect
Installation Guidelines
26
S1
S2
COM
PLC
+
24V
COM
+
24V
Internal power supply (NPN)
S1
S2
COM
PLC
+
24V
COM
+
24V
External power supply (NPN)
+
24V
Figure 4-23 NPN modes
If the signal is from PNP transistor, please set the U-shaped contact tag as below according to the
used power supply.
S1
S2
COM
PLC
+
24V
COM
+
24V
External power supply (PNP)
S1
S2
COM
PLC
+
24V
COM
+
24V
Internal power supply (PNP)
Figure 4-24 PNP modes
4.4 Layout protection
4.4.1
and input power cable in short-circuit situations
cable in short circuit situations and against thermal
overload.
Arrange the protection according to the following guidelines.
Input cable
Fuse
Figure 4-25 Fuse configuration
Note:
Select the fuse as the manual indicated. The fuse will protect the input power cable from
damage in short-circuit situations. It will protect the surrounding devices when the internal
circuited.
4.4.2 Protecting the motor and motor cable in short-circuit situations
protects the motor and motor cable in a short-circuit situation when the motor cable is