Omron CS1W-CLK21-V1, CVM1-CLK21, CS1W-RPT01 Terminating Resistance, Pin Operating level Node

C200HX/HG/HE Controller Link Units Section 4-3

Operating level 0 Operating level 1

Operating level 0

Operating level 1

Note It is not necessary to use the same operating level for all nodes in the same Network.

Pin 4	Operating level	Node
OFF (factory default)	Operating level 1	Set all the nodes on the
		Network to either Operat-
ON	Operating level 0
		ing level.

Note 1. Do not use the same operating level for more than one Unit mounted to the same PLC. An error will occur is the same operating level is set twice.

2.Operating levels are used by the CPU Unit to distinguish different Commu- nications Units. Each node can have a different operating level, i.e., it is not necessary to use the same operating level for all nodes in the same Network.

4-3-4 Terminating Resistance

Turn ON the terminating resistance using the switch on the bottom of the Unit for the Units of both ends of the Network. The terminating resistance is required at both ends of a Network to absorb unnecessary signals and reduce noise.

The Controller Link Unit has built-in terminating resistance, which can be con- nected simply by turning ON the slide switch.

ON

Bottom switch	Terminating resistance
OFF (factory default)	Not connected.
ON	Connected.

Note 1. Always turn OFF the PLC’s power before setting the terminating resistance switch.

2.Turn ON the switch to connect terminating resistance at the nodes at both ends of the Network and turn OFF the switch at all other nodes. Normal communication cannot be performed in the Network unless all the nodes are set properly.

3.The TER LED indicator will light when the terminating resistance switch is set to ON.

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