Rockwell Automation System Design for the Control of Electrical Noise - Manual (Page 63)

Publication GMC-RM001A-EN-P — July 2001
Power Distribution 7-5
24V dc Distribution
Route power wiring according to clean/dirty zones. Segregate the
following load classifications:
• Clean loads that are potentially sensitive to noise and which do
not create significant noise, e.g. controller logic supplies.
• Dirty loads that are insensitive to noise but may emit moderate
levels of noise, e.g. relay circuits.
Note: Refer to the chapter Segregating Sources and Victims for a
detailed listing of categories.
Note: Refer to the chapter High Speed Registration Inputs for special
treatments of registration input devices.
24V dc PSU Zoning Methods
The following two methods of 24V dc power supply zoning are
described in this chapter.
• Single 24 volt power supply with filtering between zones.
• Dual 24 volt power supplies.