Chapter 13 Built-in Analog Function
(7) 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
( )
[ ]
RiRc
Rs
VsRi
Vin
+
×+
×
=
2
Notes
While using a input voltage range among 1 to 5 V, 0 to 5 V, 0 to 10 V, -10 to 10 V
If the external wiring is disconnected, It will take a certain amount of time to display output data value of
0 V. If you want to reduce that time, connect the resistance about 0.1 ㏁ to 1 ㏁
between input channel
Vs
Load
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