CIRCUTOR OPC Server PS/PSS - Manual (Page 6)

PS/PSS OPC Server -6-
o Continual requests: Requests to PowerStudio are made continually,
independently of whether there are incoming OPC requests or not. This
method achieves the best possible response time, reducing update times.
The main disadvantage is that it puts a far greater strain on the system
resources.
o Grouped requests: The requests belonging to the same OPC group are dealt
with together, generating XML requests to PowerStudio only when the
requested variable belongs to a device whose values in the buffer have
expired. To get the best possible performance from this method, you must
create an OPC group for each of the different active devices.
3.4.- Detailed operation
At this point the correct way to use the setup utility to set all of the OPC server's
operating details is explained. First of all, there is a guide for creating an initial
configuration, setting the basic configuration parameters and getting started with the
server as quickly as possible. Afterwards, all of the features of the program are explained
in more detail to enable you to optimise the operation of the server by specifying and
modifying more advanced parameters.
3.5.- Steps to activate the OPC server
The first time you run the application after the installation you will see the following
message, reminding you to create an initial configuration to be able to start up the
PowerStudio OPC server:
Active configuration not set message
In the application's main dialog box, which appears next, you must enter the details
of the connection with PowerStudio and the configuration parameters of the OPC server.
Section 3.5.2 gives a detailed explanation of each of these parameters. For a basic
configuration you only need to complete the following fields:
• “Server” and “Port” with the address and the port of the PowerStudio server
that has to be accessed. If authorization is required, you will also have to fill
in the “Username” and “Password” fields.
• In the “OPC configuration” section, leave the “Optimise the OPC response
time” checkbox selected and set the update time to a value between 2 and 6
seconds, depending on the total number of variables on the server.