LSIS XBF-AH04A - Page 260

Chapter 7 Analog Input Module (XBF-AD08A)
(8) Relationship between voltage input accuracy and wiring length
In voltage input, the wiring (cable) length between transmitter or sensor and module has an effect
on digital-converted values of the module as specified below;
Where,
Rc: Resistance value due to line resistance of cable
Rs: Internal resistance value of transmitter or sensor
Ri: Internal resistance value (1㏁) of voltage input module
Vin: Voltage allowed to analog input module
% Vi: Tolerance of converted value (%) due to source and cable length in voltage input
( )
[ ]
RiRcRs
VsRi
Vin
+×+
×
=
2
1001% ×






−=
Vs
Vin
Vi
%
Vs
Rs
Rc
Rc
Ri
Load
Analog input (Voltage)
Vin
7 - 15