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3--5
F3--04ADS 4-Channel Isolated Analog Input
Connecting the Field Wiring
Your company may have guidelines for wiring and cable installation. If so, you should
check those before you begin the installation. Here are some general things to
consider.
S
Use the shortest wiring route whenever possible.
S
Use shielded wiring and ground the shield at the signal source.
Do not
ground the shield at both the module and the source.
S
Do not run the signal wiring next to large motors, high current switches,
or transformers. This may cause noise problems.
S
Route the wiring through an approved cable housing to minimize the risk
of accidental damage. Check local and national codes to choose the
correct method for your application.
The F3--04ADS receives all power from the base. A separate power supply is not
required.
Occasionally you may have the need to connect a transmitter with an unusual signal
range. By changing the wiring slightly and adding an external resistor to convert the
current to voltage, you can easily adapt this module to meet the specifications for a
transmitter which does not adhere to one of the standard input ranges. The following
diagram shows how this works.
R =
V
max
I
max
R = value of external resistor
V
max
= high limit of selected voltage range
I
max
= maximum current supplied by the transmitter
Example: current transmitter capable of 50mA, 0 -- 10V range selected.
R =
10V
50mA
R = 200 ohms
Internal
+CH1
--CH1
+
--
250
O
R
Jumper
Removed
Module
Circuitry
50mA
Current
Transmitter
+
--
NOTE:
Your choice of resistor can affect the accuracy of the module. A resistor with
a
?
0.1% tolerance and a
?
50ppm /
_
C temperature coefficient is recommended.
Wiring Guidelines
User Power Supply
Requirements
Custom Input
Ranges