Connecting The Field Wiring; Wiring Guidelines; User Power Supply Requirements; Custom Input Ranges - Automation Direct DL405 User Manual

5–6
F4–08AD 8-Channel Analog Input

Connecting the Field Wiring

Wiring
Guidelines
User Power
Supply
Requirements
Custom Input
Ranges
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 transmitter source. Do
not ground the shield at both the module and the source.
S
Don't 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 F4-08AD module requires a separate power supply. The Series DL405 CPUs,
D4-RS Remote I/O Controller, and D4-EX Expansion Units have built-in 24 VDC
power supplies that provide up to 400mA of current. If you only have a couple
analog modules, you can use this power source instead of a separate supply. If you
have more than four analog modules, or you would rather use a separate supply,
choose one that meets the following requirements: 24 VDC $10%, Class 2, 100
mA current (per module).
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 that does not adhere to one of the standard input
ranges. The following diagram shows how this works.
NOTE: Remove current jumper in module.
Field wiring
+
50mA Current
Transmitter
–
V
max
R =
I
max
R = value of external resistor
V = high limit of selected voltage range (5V or 10V)
max
I = maximum current supplied by the transmitter
max
Example: current transmitter capable of 50mA, 0 – 10V range selected.
10V
R = 200 ohms
R =
50mA
NOTE: Your choice of resistor can affect the accuracy of the module. A resistor that
has $0.1% tolerance and a $50ppm / _C temperature coefficient is
recommended.
Module internal circuitry
IN
0V
R
250 ohms
Analog switch
(Jumper removed)