Omron CVM1-CLK21, CS1W-RPT01, CJ1W-CLK21-V1, C200HW-CLK21, CQM1H-CLK21, CS1W-CLK21-V1 337

Changing the Data Link Tables with Active Data Links				Section 10-2
	Command re-	Change during
	ceived to change	active data links
	with active data	completed
	links		Time

Data link area of node with the data link table to be changed

Data link send data	Most recent data read from
	Unit
Data link receive data	Most recent data received
	from other node

Data immediately	Most recent data read from
before change	Unit.
Data immediately	Most recent data received from
before change	other node

Refresh stopped Refresh resumed

Data link communications will continue, so the Communications Error Flag for the data link status will not turn ON in any of the nodes in the network.

Refer to 10-2-4 Timing Required to Change Data Link Tables with Active Data

Links (Theoretical) for details on timing required to change the data link tables.

10-2-4 Timing Required to Change Data Link Tables with Active Data Links (Theoretical)

When changing data link tables with active data links, the data refresh for the corresponding node will stop temporarily. During that time, even if the data in the data link send area in the PLC is refreshed, it will not be sent as data link data to other nodes. Data received from other nodes will also not be shown in the data link receive area of nodes with data link tables that are being changed. The data refresh interrupt timing (maximum theoretical value) is as follows:

Data link refresh maximum interrupt time = 2 ⋅ Unit cycle time of the node with data link table being changed (See note 1.) + 3 ⋅ communications cycle time (ms)

Note 1. When CS- or CJ-series PLCs are being used, if the total number of data link send words exceeds 7,800 words, this value is multiplied by 3.

2.Consider the effect of the data link refresh interrupt time on the applica- tions when changing the data link tables. If the maximum interrupt time is not suitable for the user application, transfer the data link table after stop- ping the data links from a Programming Device as before, and then restart the data links.

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