Honeywell 2MLF-AV8A User Manual page 51

Wiring example of 4- wire sensor/transmitter (voltage/current input)
+ 4-Wire ???
DC
-
+ 4-Wire ???
DC
-
Relationship between voltage input accuracy and wiring length
With voltage input, the wiring (cable) length between transmitter/sensor and module has
an effect on digitally-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 (1MΩ) 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
ATTENTION
With current input, there is no accuracy, tolerance caused by cable length
and internal resistance of the source.
R200 Analog Input Module 2MLF-AV8A, AC8A User's Guide
September 2010
CH0 +
R *2
-
*1
+
CH7
R *2
-
*1
Ri Vs
×
Vin
=
[
( )
Rs + 2 × Rc +
Vin
 
% Vi = 1 − × 100
 
Vs
 
Honeywell
3. Installation and wiring
3.2. Wiring
R
*3
R
R
*3
R
]
Ri
%
51