OPC UA 1.02

The OPC Foundation has recently released the version 1.02 of the specification and the stack components along with some sample applications and a new version of the Local Discovery Server (LDS).

Following this release we also announced the public availability of the Java SDK 2.0 Beta, which is based on the new stack. Continue reading

OPC and MES Day Finland 2013

The OPC and MES Day Finland 2013 was held last week (Oct 15th) in Hotel Rosendahl, Tampere. This yearly event is organized by the Finnish Society of Automation and the tradition of OPC events in Finland is already a pretty long. This time we had 108 people registered and the day was indeed full of good presentations from invited speakers and sponsors of the event. Continue reading

OPC Day Italy 2013

The OPC Day Italy 2013 was held in Bologna on October 3rd. This was the first event of the kind in Italy and it was good to see a lot of attention here with a total 60 people attending the seminar. 3 new Italian companies have joined the OPC Foundation as new members this year so it looks like OPC is getting more grounds in Italy and the timing for the event was optimal! Continue reading

OPC UA Sessions, Subscriptions and Timeouts

In this article I will try to clarify all the various parameters of OPC UA communications, especially related to the various timeouts that are available.  They provide a flexible means to control the connection between the UA client and server, both on the client and server side, but it is not always very clear which parameter is which and what is the actual effect of each. Continue reading