Omron OMNUC W R88A-NCW152-DRT, Manual

Page: 116 / 292

6.3 Precautions for Communications Line Design
6-19
6
„ Noise Precautions for Peripheral Devices
Implement the following noise precautions for peripheral devices.
• Install surge suppressors on devices that generate noise, particularly devices that have an
inductive component such as motors, transformers, solenoids, and magnetic coils.
• If a surge suppressor does not fit on the device, such as a contactor, installing a ferrite
core directly next to the device’s contactors may be effective.
• Insert a line filter on the primary side of the communications power supply.
• When there are two or more communications power supplies, the DeviceNet special
cables can be grounded by simply connecting a single Power Supply Tap near the center
of the DeviceNet special cable. Do not ground shield wire at more than one place.
Device (such as a motor)
Surge suppressor
(Installed next to device.)
Surge suppressor
(Installed next to device.)
DC input type
AC input type
Device (such as a motor)
Ferrite Core 0443-164151
(made by Nisshin Electric Co, Ltd.), etc.
PS
Master
Slave xxxxxx
[When There Is One Power Supply]
PS
Master
Slave
xxx
xxx
Power Supply Tap
PS PS
[When There Are Two or More Power Supplies]
T-branch Tap or Power Supply Tap
Power Supply Tap
Power Supply Tap
Slave
Ground at only one point.