DL205 Analog Manual, 7th Edition Rev. D
15-6
Chapter 15: F2-8AD4DA-1, 8-Ch. In / 4-Ch. Out Analog Current 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:
• Use the shortest wiring route whenever possible.
• 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.
• Do not run the signal wiring next to large motors, high current switches, or transformers. This
may cause noise problems.
• 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.
User Power Supply Requirements
The F2-8AD4DA-1 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 100mA at 18–26.4 VDC. In addition, each current loop requires 20mA (a total of
240mA for twelve current loops). If a separate power supply is used, be sure that it meets these
requirements.
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 one combination module is used with
less than ten current loops.
In some applications, it is desirable to power the loops separately in a location remote from the
PLC. This will work as long as the loop’s power supply meets the voltage and current require-
ments, and its minus (-) side and the module supply’s minus (-) side are connected together.
WARNING: If the internal 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:
• 1. Use a separate linear power supply.
• 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 ±0.025% of range.
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