Omron CS1W-ETN21 - Manual (Page 62)

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Network Installation Section 2-4
2-4-4 Using Contact Outputs (Common to All Units)
Communications errors can occur when Contact Output Units are mounted to
the same Rack or connected to the same PLC as an Ethernet Unit due to
noise generated by the contact outputs. Use one or more of the following
measures when installing Contact Output Units and Ethernet Units on the
same Rack.
Mounting Location Mount (or connect) any Contact Output Units as far away from the Ethernet
Unit as possible.
Cable Location Separate the transceiver cable or twisted-pair cable connecting the Ethernet
Unit as far from the wiring to the Contact Output Units as possible. The coax-
ial cable must also be placed as far away from the Contact Output Units and
their wiring as possible.
Hub Measures Attach several ferrite cores designed for EMI countermeasures on the trans-
ceiver cable or twisted-pair cable near the hub. The transceiver must also be
placed as far away from the Contact Output Units and their wiring as possible.
Contact Output Unit
Ethernet Unit
Contact outputs
Transceiver/Hub
Contact Output Unit
Ethernet Unit
Contact outputs
To transceiver/hub
Transceiver/Hub
Ferrite core
Transceiver
cable
Ethernet Unit