Connecting The Field Wiring; Wiring Guidelines; User Power Supply Requirements; Using Current Or Voltage Wiring - Automation Direct DL405 User Manual

Connecting the Field Wiring

Wiring Your company may have guidelines for wiring and cable installation. If so, you
Guidelines should check those before you begin the installation. Here are some general things
to consider.
User Power The F4-04AD requires a separate power supply for the isolated (field) side of the
Supply module. 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
Requirements
current. If you only have a couple of 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).
Using Current or Even though you cannot select different ranges or units for each channel, you can
Voltage Wiring still wire each individual channel for voltage or current signals. For example, even
though you select a 1 to 5V range with the jumpers, you can still use a transmitter
that provides a 4-20 mA signal.
The module uses a 250 ohm precision resistor to convert the current signals to
voltage for you (4mA x 250 ohms = 1V, 20mA x 250 ohms = 5V). The following
diagram shows how this works. Notice that the voltage (V) and (I) input terminals
are connected together.
S
Use the shortest wiring route whenever possible.
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Use shielded wiring and ground the shield at the transmitter source. Do
not ground the shield at both the module and the source.
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Don't run the signal wiring next to large motors, high current switches,
or transformers. This may cause noise problems.
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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.
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Unused inputs must be shorted to help reduce the effects of electrical
noise (see the wiring diagram for an example).
Field wiring
(external to module)
Generated
+
voltage
Current
(1 to 5V)
transmitter
(4 to 20mA)
–
F4–04AD 4 Channel Analog Input
Module
(internal equivalent circuit)
V
High impedance
Current flow
I
250 ohms
C
0V
High impedance
3–9
0V