Digital Indicators K3HB-R/-P/-C 31
20.Do not pull the DeviceNet communications cables with excessive
force or bend them past their natural bending radius.
21.Do not connect or remove connectors while the DeviceNet power
is being supplied. Doing so will cause product failure or
malfunction.
22.Use cables with heat resistance of 70
°C min.
■ Noise Countermeasures
1. Do not install the product near devices generating strong high-
frequency waves or surges, such as high-frequency welding and
sewing machines.
2. Mount a surge suppressor or noise filter to peripheral devices
generating noise, in particular, motors, transformers, solenoids,
and magnet coils.
3. In order to prevent inductive noise, wire the lines connected to the
terminal block separately from power lines carrying high voltages
or currents. Do not wire in parallel with or in the same cable as
power lines. Other measures for reducing noise include running
lines along separate ducts and using shield lines.
Example of Countermeasures for Inductive Noise on
Input Lines
4. If a noise filter is used for the power supply, check the voltage and
current, and install the noise filter as close to the product as
possible.
5. Reception interference may occur if the product is used close to a
radio, television, or wireless.
Digital
Indicator
Line filter
Power supply input
Surge
absorber
Signal input
Digital
Indicator
+
−
Power supply input
2 conductors
with shield
Signal
input
+
−
Digital
Indicator
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