PCVisionplus
Hardware Reference
B–1
Rev 02; February 8, 2002
APPENDIX B
USING OPTO-ISOLATORS
When connecting industrial equipment to computers and peripherals, it is always recommended you use optically
coupled isolators, or opto-isolators. The input plus and minus connections are the two sides of the LED (light emit-
ting diode). The output plus and minus connections are the collector and emitter of an NPN transistor. Figure B–1
shows a single opto-isolator.
+
–
+
–
Figure B–1. Basic Opto-Isolator
The PCVisionplus uses the HPCL-0631 for its opto-isolatoed trigger input. Chapter 1 lists the recommended operat-
ing current and voltage values. Do not exceed the absolute maximum ratings of the diode in these devices.
•
Diode Absolute Maximum Ratings (no derating up to 85
°
C)
If
15 mA
Forward Current (on)
Vr
5 V
Reverse Voltage (off)
Pi
40 mW
Power Dissipation
•
Transistor Absolute Maximum Ratings
Vcc
7 V
Supply Voltage (1 minute maximum)
Ve
Vcc + 0.5 V
Enable Input Voltage
Ie
5 mA
Enable Input Current
Io
50 mA
Output Collector Current
Po
60 mW
Output Collector Power Dissipation
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