Specifications

A - 6 RSLinx – Training Guide
The OPC client poll rate can over ride the RSLinx topic
poll rate
The information in this technote applies to:
Product:
RSLinx
Type:
Release Note
Technote ID:
R221
Package/Mod
ule(s):
RSLinx (All)
Modified:
12/28/98
Revision(s):
2.x
Fixed In
Revision:
N/A
Sub-
System(s):
DDE/OPC Server
Technical Note Details:
If the update rate specified by an OPC client is faster than the poll rate specified in
RSLinx. RSLinx will request data from the PLC as the update rate specified by the OPC
client
Example: If the poll rate in RSLinx is set to 1000ms, and the update rate of the OPC
client is set for 200ms then RSLinx will request data from the PLC every 200ms.
Example: If the poll rate in RSLinx is set to 200ms, and the update rate of the OPC
client is set for 1000ms then RSLinx will request data from the PLC every 200ms.
However, the OPC client will only request the data from RSLinx every 1000ms
Note: DDE links will update at the actual poll rate RSLinx uses. In the case where the
OPC client update rate is faster than the RSLinx poll rate, DDE clients will also be
updated at the rate of the OPC client
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