6-
6
Parallel I/O interface
6
1. Standard I/O interface overview
1.5.2
General-purpose outputs
NPN specifications
Photocoupler
(PS2801 or equivalent)
NPN Darlington transistor
(2SD2195 or equivalent)
External power
supply DC 24V
DC24V
DO 20 to DO27
GND
Controller side
PNP specifications
PNP Darlington transistor
(2SB1580 or equivalent)
External power
supply DC 24V
Controller side
DC24V
GND
DO 20 to DO27
Photocoupler
(PS2801 or equivalent)
c
CAUTION
• When an inductive load
(solenoid, relay, etc.) is used,
always connect a diode in
parallel as a surge killer.
• Never short the DO output to DC
24V (NPN specifications) since
this will damage the internal
circuitry.
• Never short the DO output to
GND (PNP specifications) since
this will damage the internal
circuitry.
• See "7. I/O connections" in
Chapter 3 for a definition of
NPN and PNP specifications.
Summary of Contents for RCX142
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