LSIS XBF-AD08A - Page 158

Chapter 5 Thermocouple Input Module (XBF-TC04S,TC04B)
(4) Voltage (0~100mV) input wiring example
XBF-TC04B
+
-
CH0
+
-
+
-
CH1
+
-
CH0-
DC24V+
DC24V-
DC power
(Analog power
supply)
+
-
CH2
+
-
+
-
CH3
+
-
CH0+
CH1-
CH1+
CH2-
CH2+
CH3-
CH3+
+ -
K,J,T,R
0~100mV
XBF-TC04B
Input resistance of voltage input circuit is 1 MΩ (min.).
(5) 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
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