Setup guide

Chapter 3 Driver and Protocol Objects
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Automationdirect.com 3-75 Object Reference Manual
other system variables, including communications speed and what other tasks are being
performed at any particular moment.
Update Rate is a numeric expression that determines how often the OPC
server updates the client. Enter this time interval in milliseconds.
Deadband sets the percentage change that must take place in a data
member before the OPC server reports a change in value to Lookout
Direct
.
Poll Device is a logical expression. When this expression changes from
FALSE to TRUE, Lookout
Direct
polls the OPC server for all values. You
can use a simple expression like the signal from a pushbutton, or a complex
algorithm. In most applications there is no need to do device reads, so this
parameter is often left blank.
Enter a Default Access Path if you want to simplify entering paths to
various data members.
Communication Alarm Priority specifies the priority of alarms generated
by this OPC client object.
OPC Client Data Members
As with all LookoutDirect
drivers, you can access I/O points and other data
through data members.
Unlike other LookoutDirect driver objects, however, the OPCClient data
member set changes depending on the OPC servers you have running on
your computer.
If you selected hierarchical browsing when you created the OPCClient, the
data members for the OPC server you have connected your OPC client to
appear as data members inside a folder in your OPCClient list of data
members in the Lookout
Direct
Object Explorer, connection editor, and
other windows as shown in the following illustration.