PCO Query : No of rows in Pco Query

[Former Member]

Hi Friends,

I am using Pco query to get Tags values from PHD. If i query for around 1500 tags i am getting only 1100 tags values in return, could any one suggest me that how to increase the number of row returned by Pco, at present in Pco console number of rows returned is maintained 100 but still it gives around 1100 rows in one shot instead of 100.

So, i guess there mujst be some way to change the number of Rows returned by Pco query.

[former_member196557 · Accepted solution]

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