GFK-0356Q Chapter 2 Installation 2-17
2
General Wiring Guidelines
Warning
In addition to the following wiring suggestions, we strongly urge that you
follow all wiring and safety codes that apply to your area or your type of
equipment. For example, in the United States, most areas have adopted the
National Electrical Code standard and specify that all wiring conform to its
requirements. In other countries, different codes will apply. For maximum
safety to personnel and property you must follow these codes. Failure to do
so can lead to personal injury or death, property damage or destruction, or
both.
Color Coding Wires
These color codes are commonly used in industrial equipment manufactured in the United States.
They are cited here as a reference. Where they are in conflict with codes that apply to your area or
your type of equipment, you should follow your applicable codes instead. Besides satisfying code
requirements, wire color coding makes testing and troubleshooting safer, faster, and easier.
Ŷ Green or green with stripe- Ground
Ŷ Black - Primary AC
Ŷ Red - Secondary AC
Ŷ Blue - DC
Ŷ White - Common or neutral
Ŷ Yellow - Secondary power source not controlled by the main disconnect. Alerts maintenance
personnel that there may be power present (from an external source) even if the equipment is
disconnected from its main power source.
Wire Routing
To reduce noise coupling among PLC wires, it is recommended you keep electrically noisy wiring,
such as AC power wiring and Discrete Output Module wiring, physically separated from low-level
signal wiring such as DC and Analog Input module wiring or communications cables. This can be
accomplished by grouping separately, where practical, the following categories of wiring:
Ŷ AC power wiring. This includes the AC input to the PLC power supply, as well as other AC
devices in the control cabinet.
Ŷ Analog Input or Output Module wiring. This should be shielded to further reduce noise
coupling. See the Series 90-30 I/O Module Specifications Manual, GFK-0898 for details.
Ŷ Discrete Output Module wiring. These often switch inductive loads that produce noise
spikes when switched off.
Ŷ DC Input Module wiring. Although suppressed internally, these low-level inputs should be
further protected against noise coupling by observing these wiring practices.
Ŷ Communications Cables. Wiring such as Genius Bus or serial cables should be kept away
from noise-producing wiring.
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