Omron CJ1W-CLK21-V1, CVM1-CLK21, CS1W-RPT01, C200HW-CLK21 Setting the Polling and Polled Nodes

Communications Mechanism Section 8-1

			Check		Check
		Token circulation	Polling cycle	Token circulation	Polling cycle
		cycle		cycle
Polling Node		Communications cycle time		Communications cycle time
	Each Controller Link Network always has a Unit that controls communications
	within the network. This Unit is called the “polling node.” Normally, the node
	that has the smallest node address in the network is the polling node (see
	note). All Units at nodes other than the polling node are called “polled nodes”

(or polled units). The polling node controls the token, checks the network, and performs other relevant tasks. Should the polling node break down, the node with the next smallest node address is automatically selected as the polling node to prevent the entire network from shutting down.

Note The node with the smallest node address is not always the polling node, depending on the Unit start-up sequence, models, settings, and Unit status.

When the polling node breaks down, the next polling node is temporarily dis- connected from the network, reconstructs the network, and then reconnects to the network. Polling nodes remain connected to the network.

8-1-2 Setting the Polling and Polled Nodes

Use the Programming Device for the PLC to set Units as polling node or polled node in the DM Parameter Area.

CS/CJ-series Controller Link Units

	15 14 13 12 11 10							9	8	7	6	5	4	3	2	1	0
DM 30000 + 100 ⋅ N	0	0	0		0	0	0	0	0	0	0	–	–	0	0	0	–	–: Other settings
N: Unit number				Polling node/polled node bit
				0: Polling node
				1: Polled node

C200HX/HG/HE Controller Link Units

Operating level 0 15 14 13 12 11 10 9 8 7 6 5													4	3	2	1	0
DM 6400	0	–	0		–	0	0	0	0	0	0	–	–	0	0	0	0	–: Other settings
Operating level 1				Polling node/polled node bit
				0: Polling node
DM 6420
				1: Polled node

CVM1 and CV-series Controller Link Units

15 14 13 12 11 10							9	8	7	6	5	4	3	2	1	0
DM 2000 + 100 ⋅ N	0	0	0	0	0	0	0	0	0	0	–	–	0	0	0	–	–: Other settings

N: Unit number

CQM1H-series Controller Link Units

Polling node/polled node bit 0: Polling node

1: Polled node

DM 6400	15 14 13 12 11 10						9	8	7	6	5	4	3	2	1	0
	0	–	0	–	0	0	0	0	0	0	–	–	0	0	0	0	–: Other settings

Polling node/polled node bit 0: Polling node

1: Polled node

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