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Before Operation
Output Wiring
Considerations
40
When wiring outputs, apply the following points to avoid noise interference and
optimize Analog Output Unit performance.
• Use shielded twisted-pair cable for external connections and power lines.
• Route output cables separately from the AC cable, and do not run the Unit's
cables near a main circuit cable, high voltage cable, or a non-PC load cable.
• Be sure to install surge-absorbing diodes or surge absorbers for inductive
loads (relays, solenoids, electromagnetic valves, etc.) They should be
installed right next to relays and solenoids. Use surge-absorbing diodes with a
dielectric strength of at least five times the circuit voltage.
DC Relay
Surge-absorbing diode
(Example: ERB44-06,
by Fuji Electric)
Solenoid, etc.
Surge absorber
(Example: CR-50500,
by Okaya Electric)
• If there is noise interference from power lines (if, for example, the power supply
is shared with electrical welding devices or electrical discharge machines, or if
there is a high-frequency generation source nearby) install a noise filter at the
power supply output area.
• Connect to a ground of 100 Ω or less, with as heavy a wire as possible (i.e., at
2
least 1.25 mm
).
Section 3-1
AC Relay
Surge absorber
(Example: CR-50500,
by Okaya Electric)
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