Active Data Links (Theoretical) - Omron SYSMAC 3G8F7-CLK13-E Operation Manual

Changing the Data Link Tables with Active Data Links
5-5-4 Timing Required to Change Data Link Tables with Active Data
Links (Theoretical)
Note
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 5-5-4 Timing Required to Change Data Link Tables with Active Data
Links (Theoretical) for details on timing required to change the data link
tables.
When changing data link tables with active data links for Controller Link Sup-
port Boards, 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 computer 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 areas of the
other nodes. The data refresh interrupt timing (maximum theoretical value) is
as follows:
Data link refresh maximum interrupt time = Communications cycle time × 3 +
250 ms + Computer overhead time (See note 1.) (ms)
1. The overhead time of the computer varies somewhat with the MPU pro-
cessing capability and the load created by other applications.
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.
3. Refer to the Controller Link Units Operation Manual (W309) for information
on changing data link tables with active data links.
Section 5-5
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