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Use the following table to determine if an external resistance is required and if
so, what value it should be. Note that a one-half watt resistor is sufficient. The
resistance values in the table below have been calculated to result in
approximately 5.0 milliamps forward current through the optoisolator’s internal
LED.
Applied Voltage to GPI
External Resistance
3.3 Volts
None
5.0 Volts
330 Ohms
6.0 Volts
470 Ohms
7.5 Volts
820 Ohms
10 Volts
1.3 k Ohms
12 Volts
1.8 k Ohms
15 Volts
2.4 k Ohms
24 Volts
3.9 k Ohms
30 Volts
5.1 k Ohms
*48 Volts*
9.1 k Ohms
* For personnel safety reasons voltages in excess of 48VDC is NOT
recommended to be applied to the GPI interface.
Example Schematic of General Purpose Inputs
Содержание AirAura
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