3-
11
3
I/O INTERF
ACE
3-4 I/O Circuits
When external 24V power supply is used.
External DC24V
power supply
Internal DC24V power supply
Push-button
NPN transistor
Incandescent lamp
Solenoid valve
Input signal
Photocoupler
Output signal
DI
DO
DO
DI
+IN COM
0V
Controller side
c
CAUTION
To prevent possible accidents when using an external 24V power supply, do not use it simultaneously with the
internal power supply.
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