DB –24P/24PD
11.6. Isolated Input
The
normal input voltage range is 5 to 24 V AC or DC . The normal input
range can be changed by choosing suitable resistor to limit the current
through the Photo-isolator to about 10 mA(
I
f). The default resistor is
1.2K
Ω
/1 W.
PC-814
DIH
DIL
Jumper
AC Filter
Vin
24V
Ri=1.2K
Ω
/1W
R
i = Vin/
I
f
P
w =
V
in x
I
f
Calculation Example:
If
V
in =120V then
R
i=120(V) /0.01(A)=12K
Ω
P
w=120(V) x 0.01(A) =1..2W
The
R
i must be replaced by 12K
Ω
/2W(1.2W)
User’s Manual for DIO Daughter Boards (Ver.2.5, Jan/2004 )
53
