DL205 Analog Manual, 7th Edition Rev. D
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Chapter 16: F2-8AD4DA-2, 8-Ch. In / 4-Ch. Out Analog Voltage Combination
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Connecting the Field Wiring
Wiring Guidelines
Your company may have guidelines for wiring and cable installation. If so, check the guidelines
before beginning the installation. Here are some general things to consider:
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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 load or source.
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Do not 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 should be shorted together and connected to common.
User Power Supply Requirements
The F2-8AD4DA-2 requires at least one external power supply for the field devices. The same
or separate power sources can be used for the module supply and loop supply. The module
requires 80mA at 18–26.4 VDC.
The DL205 bases have built-in 24VDC power supplies that provide up to 300mA of current.
This may be used instead of a separate supply if only a few modules are being used.
In some applications, it is desirable to power the transmitters separately in a location remote
from the PLC. This will work as long as the transmitter’s power supply meets the voltage and
current requirements, and transmitter power supply’s minus (-) side and the module supply’s
minus (-) side are connected together.
WARNING: If the 24VDC base power is used, be sure to calculate the power budget. Exceeding the power
budget can cause unpredictable system operation that can lead to a risk of personal injury or equipment
damage.
The DL205 base has a switching type power supply. As a result of switching noise, ±3–5
counts of instability may be noticed in the analog input data if the base power supply is used.
If this is unacceptable, try one of the following:
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1. Use a separate linear power supply.
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2. Connect the 24VDC common to the frame ground, which is the screw terminal marked “G”
on the base.
When using these methods, the input stability is rated at ±0.03% of range.
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