Rockwell Automation DAG6.5.8 APPLICATION GUIDE SCADA SYSTEM - Manual (Page 313)

Publication AG-UM008C-EN-P - February 2005
Configuring RSLinx Classic Software for DF1 Half-Duplex Communications 9-7
Figure 9.6 Polling Strategies
Table 9.6 Polling Strategies Parameter Descriptions
Control Control Text
Don't Allow Msgs to Stns that
are not in lists Enable this to prevent transmissions to stations not already defined in one of the polling lists. Depending
on the Result send to originator of msg settings, the sender of the packet may or may not be informed by
the driver that the packet was rejected. This is the default setting.
Result send to originator of
msg Select Generate Error Reply to instruct the driver to inform the sender that the station is not on the link by
generating a packet with a status code of 2 (station not on a link). Select Do nothing to instruct the driver
not to send any indication to the sender. The default is generate error reply.
Allow Msgs to Stns that are
not in lists Enable this to allow transmissions to stations not defined in one of the polling lists. This provides the
ability to communicate to slave devices on an event triggered basis.
Create Temporary Polling List -
Delete Stn when done When the expected replies reach zero, the driver requests additional packets. If the slave answers with no
packets, and no packets intended for the slave are buffered in the driver, this station is deleted from the
dynamic polling list, and all activity to the slave ceases until another packet is received. Also, if the driver
sends a polling packet to the slave and the slave is assumed to be inactive, the count is set to zero, and if
no other packets are intended for the slave, the slave is removed from the temporary polling list.
Whether this gets assigned to
Priority or Normal Polling List When using temporary polling, the driver must know whether to treat these temporary stations the same
as normal or priority polling stations.
Add new Stn to Priority Polling
List When a packet is intended for a slave that is not in one of the polling lists, the station is permanently
added to the priority polling list and is treated the same as any other priority slave.
Add new Stn to Normal
Polling List When a packet is intended for a slave that is not in one of the polling lists, the station is permanently
added to the normal polling list and is treated the same as any other normal slave.
Save new Stn to Driver Cfg
File (Permanent) When the station is added to the priority or normal polling list, the addition is only in effect until the driver
is shut down. If this option is enabled, those stations are permanently added to the polling lists, and will
display the next time the driver is used.
Boost a Normal Stn to Priority
when expecting a reply This feature is not yet implemented.
Defaults Resets the default values for each control on the dialog box.