Omron NX-ECC201 User Manual page 128

6 Installation
 Supplying I/O Power from External Sources
Wiring External I/O Signal Lines
Observe the following points when wiring external I/O signal lines.
• To absorb reverse electromotive force when an inductive load is connected to an output signal, con-
nect a surge suppressor near the inductive load in an AC circuit, or connect a diode near the induc-
tive load in a DC circuit.
Inductive
load
Connect a diode in a DC circuit.
Input Signal Noise Countermeasures
• Never bundle I/O cables with high-voltage or power lines, and do not route them in close proximity or
parallel to such lines. If output signal lines must be routed in close proximity to such lines, place them
in separate ducts or conduits. Be sure to ground the ducts or conduits.
I/O cables
Power lines
Suspended ducts
• If the signal lines and power lines cannot be routed in separate ducts, use shielded cable. Connect
the shield to the ground terminal at the EtherCAT Slave Terminal, and leave it unconnected at the
input device.
• Wire the lines so that common impedance does not occur. Such wiring will increase the number of
wires, so use common return circuits. Use thick wires with sufficient allowance for the return circuits,
and bundle them with lines of the same signal level.
• For long I/O lines, wire the input and output signal lines separately.
• Use twisted-pair wires for pilot lamps (and particularly lamps with filaments).
6 - 28
Power circuits
Power supply for general operations circuits
Power supply for input circuits of EtherCAT Slave Terminal
Power supply for output circuits of EtherCAT Slave Terminal
Noise
filter
Power Supply System Diagram
DC
Diode
Input
Unit
I/O cables Power lines
Floor ducts
I/O Cable Arrangement
Unit power supply for EtherCAT Slave Terminal
Outlet (for peripheral devices)
Surge
suppressor
Inductive
load
Output
Unit
Connect a surge
suppressor in an AC circuit.
Output Signal Noise Countermeasures
I/O cables Power lines
Conduits
NX-series EtherCAT Coupler Unit User's Manual (W519)
Inductive Diode
load
Output
Unit
Connect a diode
in a DC circuit.