Hi Mahesh,
Which Version, Service Pack and Patch of PCo are you using?
For PCoQuery actions from MII, there are no user settings that manage the number of rows returned by PCo. In some earlier versions of PCo 2.2 there was an internal limit of 255 tags at a time for a request > 255 tags (i.e, a request for 1100 Tags would be sent to PHD as 255, 255, 255, 255, 80...). You can enable detailed logging in PHD OPC Server (it is a registry setting, don't have details but should be documented in PHD OPC Server docs) and see the number of tags being requested from PHD at a time by PCo.
The current available version of PCo is 2.3SP4 Patch 11. (2.304.2066.1134)
Regards, Steve
