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4 - 47
4 Installation and Wiring
NX-series Digital I/O Unit User’s Manual (W521)
4
-4 Wiring
E
x
amp
les
4
4-
4-2 Pr
ecau
tions when
Wiring to th
e Outp
ut Unit
s
If a load connected to the output terminals is short-circuited, output components and printed circuit
boards may be damaged. To guard against this, use the NX Units with load short-circuit protection.
When using the NX Units without load short-circuit protection, incorporate a protective fuse in the exter-
nal circuit. Use a fuse with a capacity of around twice the rated output.
When connecting a transistor to an output device with a high inrush current (such as an incandescent
lamp), steps must be taken to avoid damage to the output transistor.
Use either of the following methods to reduce the inrush current.
Countermeasure 1
Draw about 1/3 of the current consumed by the load.
When I/O power is supplied from the NX bus, the method is as shown in the following figure.
When I/O power is supplied from an external source, the method is as shown in the following figure.
4-4-2
Precautions when Wiring to the Output Units
Output Short-circuit Protection
Inrush Current
IOG
IOV
IOG
IOV
Transistor Output Unit
OUT
IOG
IOV
IOG
IOV
OUT
NPN type
PNP type
L
L
Communications
Coupler Unit or
Additional I/O Power
Supply Unit
Transistor Output Unit
Communications
Coupler Unit or
Additional I/O Power
Supply Unit
OUT
COM
R
Transistor Output Unit
NPN type
PNP type
L
+
OUT
COM
R
Transistor Output Unit
L
+
Содержание NX-IA3117
Страница 34: ...Sections in this Manual 32 NX series Digital I O Unit User s Manual W521...
Страница 52: ...1 Features and System Configuration 1 18 NX series Digital I O Unit User s Manual W521...
Страница 56: ...2 Specifications 2 4 NX series Digital I O Unit User s Manual W521...
Страница 152: ...5 I O Refreshing 5 36 NX series Digital I O Unit User s Manual W521...
Страница 204: ...8 Digital Mixed I O Units 8 8 NX series Digital I O Unit User s Manual W521...
Страница 224: ...9 Troubleshooting 9 20 NX series Digital I O Unit User s Manual W521...
Страница 230: ...10 Inspection and Maintenance 10 6 NX series Digital I O Unit User s Manual W521...
Страница 290: ...Appendices A 60 NX series Digital I O Unit User s Manual W521 Installation Height 100 71 Unit mm...
Страница 337: ...I 1 I NX series Digital I O Unit User s Manual W521 Index...
Страница 340: ...I 4 NX series Digital I O Unit User s Manual W521 Index...