3. Installation and wiring
3.2. Wiring
R200
Analog Input Module 2MLF-AV8A, AC8A User's Guide
51
September 2010
Honeywell
Wiring example of 4- wire sensor/transmitter (voltage/current input)
+
R
4-Wire
???
4-Wire
???
-
CH0
CH7
+
-
R
R
R
DC
+
-
DC
+
-
*3
R
R
*2
*2
*3
*1
*1
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 (1M
Ω) 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
(
)
[
]
Ri
Rc
Rs
Vs
Ri
Vin
+
×
+
×
=
2
100
1
%
×
−
=
Vs
Vin
Vi
%
ATTENTION
With current input, there is no accuracy, tolerance caused by cable length
and internal resistance of the source.
Содержание 2MLF-AC8A
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Страница 119: ...6 Programming 6 3 Basic program R200 Analog Input Module 2MLF AV8A AC8A User s Guide 119 September 2010 Honeywell ...
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