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Prosys OPC UA Client
User Manual
Version 3.1.6
Table of Contents
OPC UA Client Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Ê1
OPC UA Servers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Ê2
Discovery Servers. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Ê2
Connecting to a Server . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Ê3
Security Options . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Ê3
Application Instance Certificates . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Ê4
User Authentication . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Ê5
Address Space Browser . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Ê7
Nodes. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Ê8
Searching for a Node . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Ê8
Writing to a Variable . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Ê9
Calling a Method . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Ê10
Attributes and References View . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Ê11
Browsing via References . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Ê11
Data View . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Ê12
History View . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Ê16
Event View . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Ê18
Basic Events and Conditions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Ê19
Condition Refresh . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Ê19
Event History View. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Ê20
Image View . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Ê21
OPC UA Client Overview
Prosys OPC UA Client is a generic purpose OPC UA client. You can test connections and view data from
any OPC UA server. The main functions include browsing the server address space, reading and writing
variables, monitoring variables and events and reading history of variables and events.
Prosys OPC UA Client implements the three OPC UA information models:
1. Data Access
2. Historical Access
3. Alarms & Conditions
With the OPC UA Client you can have multiple secure server connections and manage them using
tabbed pages. The address space of each server is represented in the Address Space Browser on the left
side of the user interface window. For each server, you can also use several tabbed pages for different
data visualizations.
Attributes and References is a default view for every server and in addition, you can add any number of
the other views: Data View for monitoring variables, History View to explore historical data of variables,
Event View to monitor events and alarms and Event History View for requesting history of events from the
server. Image View provides a special option for monitoring of image data. Figure 1 illustrates the
overview of the OPC UA Client.
Figure 1. OPC UA Client Overview
Page 1/21
OPC UA Servers
OPC UA Servers are connected with a server address (aka Server URL). To connect, you will need to find
out the address of the server that you wish to connect to.
The address always takes the form
<Protocol>://<Hostname>:<Port>/<ServerName>
The address starts with a Protocol identifier, which is most often opc.tcp:// (corresponding to OPC UA
TCP). The protocol identifier is followed by the hostname of the computer in which the server is running
(localhost always works locally as well) and the TCP port which the server is listening. OPC UA defines a
standard port number 4840, but this is often reserved for a Discovery Server and the actual servers use
custom port numbers. The server address may also contain a ServerName part. If the ServerName is
not defined, the / character before it may be omitted.
If you don’t have any actual OPC UA servers available to connect to, you can use the Prosys OPC UA
Simulation Server to play around with the Client application. You can download Prosys OPC UA
Simulation Server from https://www.prosysopc.com and run it locally. You can then use the server
address:
opc.tcp://localhost:53530/OPCUA/SimulationServer
Alternatively, you can connect to a publicly available server via Internet. The address of that server is:
opc.tcp://uademo.prosysopc.com:53530/OPCUA/SimulationServer
Discovery Servers
OPC UA defines two types of Discovery Servers:
• Local Discovery Server (LDS) is often installed in the PC to keep a list of installed servers in the local
computer. OPC Foundation provides a standard implementation of the LDS.
• Global Discovery Server (GDS) is an application that is designed to keep a list of servers installed in
a site-wide network. The GDS can also manage application instance certificates as a central
Certificate Authority (CA). OPC Foundation provides a sample implementation of the GDS.
In addition, each OPC UA server contains an internal discovery server that can provide similar
information about the server application itself. The LDS is typically listening at TCP Port 4840 (having
address opc.tcp://localhost:4840). Several embedded devices and PLCs, which do not have any LDS are
also using Port 4840 for the actual server address.
If you have a GDS available, you will need to find its address, similar to other OPC UA server
applications.
Page 2/21
Connecting to a Server
Connecting to an OPC UA server is based on the server address (or Server URL) that can be typed in the
address bar at the top of the window (see Figure 2). The previously used addresses are available from
the dropdown menu so that it is easy to reselect them. On the right hand side of the address bar, there
is a button for connecting and disconnecting with the server. If the client cannot connect to the server,
it shows an error message indicating the reason for that.
Figure 2. Server Address Bar (1.) Connect button (2.) Security Settings (3.) and User Authentication Settings (4.)
In case the client manages to connect, but determines that the target is an OPC UA Discovery Server
(see Discovery Servers, above), it will prompt for a selection from the available server addresses
provided by the discovery server. You can then choose one of the actual server address to make a new
connection attempt.
Prosys OPC UA Client accepts partial addresses to be entered as well: if you only enter the hostname, it
will assume opc.tcp as the protocol and port number 4840.
Security Options
Whenever you make a connection to the server, you must choose the level of security to use. The
security options include Security Mode and Security Policy. The alternative Security Modes are:
1. None
2. Sign
3. Sign & Encrypt
If the selected Security Mode is None, the connection is not secured at all. If Sign is selected, the
messages used in the communication are signed to protect them from alteration during transfer.
Choosing Sign & Encrypt gives the highest level of security, protecting the contents of the
Page 3/21
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