Vigilant User Manual
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Description
Text of description, for user notes only.
Protocol
Only TCP is supported.
Host
IP or web address of the device that will act as OPC endpoint.
Port
TCP port that the server has reserved for OPC communications. By default, VIGILANT
is set at 4840.
URL Path
Additional URL address for the OPC-UA
Endpoint
(optional).
Authentication
Type of authentication used for access control. Allowed types are:
-
Anonymous
.
-
Username Identity Token
. In this case the user must define the
User
and
Password
fields.
Security Policy
Only the None option is allowed.
Poll period
Period for updating the values of the
Nodes
that belong to the
Endpoint
and are
configured to execute
Read
services (
Node
reading period).
Write period
Period for updating the values of the
Nodes
that belong to the
Endpoint
and are
configured to execute
Write
services (
Node
writing period).
12.9.4.
OPC nodes
In OPC-UA, every entity or data structure in the Namespace is a
Node
, with has a unique identifier
(
NodeId
) defined with 3 elements:
•
NameSpaceIndex
: The index value that identifies the
Namespace
of the
Endpoint
to which the
Node
belongs.
•
IdentifierType
: Sets the type of identifier. This can be
Numeric
,
Opaque
,
String
or
GUID
.
•
Identifier
: Sets the identifier of the node. It has to be unique within the
Namespace
defined by
the
NamespaceIndex
field.
The following picture shows examples of OPC nodes.
