6.3.2 Using Isolated Input
Basic Circuit
Switch
DI n +
DI n -
If Using AC Signal, the P16R16DIO
JP1 must be shorted 1-2, ref. to
chapter 2-3-2
5 ~ 24
V
AC
/ V
DC
Figure 3-3, n is the channel number.
The normal input voltage range is 5 ~ 24 V
AC
or V
DC
. The normal input range can
be changed by choosing suitable resistor to limit the current through the
opto-isolator to about 10 mA(
I
f
). The default resistor is 1.2 k
Ω
/ 0.5 W.
V
IN
PC - 814
24 V
R
i = 1.2 k
Ω
/ 0.5 W
I
f = 10 mA
Figure 3-4.
R
i =
V
in /
I
f
P
w =
V
in X
I
f
Calculation Example:
If
V
in = 120 V Then
R
i = 120 (V) / 0.01 (A) = 12 k
Ω
P
w = 120 (V) X 0.01 (A) = 1.2 W
The
R
i Must Replace By 12 k
Ω
/ 2 W (1.2 W)
P8R8-DIO/P16R16-DIO User Manual (Ver.1.7, Oct. 2011, IMH-009-17)
32
