Omron CQM1H-CLK21 - Manual (Page 390)

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Using the Relay Terminal Block Appendix C
Note 1. Signal will still be flowing through the communications cables during the replacement procedure if the
network is still operating. Use an insulated screwdriver and be very sure that the metal portions of the
Relay Terminal Block or the communications cable crimp terminals do not come into contact with any
conductive material.
2. Replace the Unit only after confirming that doing so will not affect the system, including the affects of
separated nodes or communications errors.
3. Always turn OFF the power supply to all nodes when connecting communications cables to or remov-
ing them from the Relay Terminal Unit.