Rockwell Automation T8030 Trusted OPC Server - Manual

SDS-8030
Trusted
TM Industrial Control System
Trusted TM OPC Server-T8030
Issue 6 Jan 2006
OPC DISPLAY
DESCRIPTION
OPC ( OLE for Process Control ) is an industry
standard for transferring process data between
a server and one or more client applications.
The Trusted TM OPC Server provides an OPC
link between a Trusted TM and one or more
OPC clients. Using Ethernet Interface cards
within the Servers host PC, it connects to one
or more Trusted
TM Controllers. OPC client
applications can connect to the server using
Microsoft COM ( or DCOM over a network ).
Each client can browse the server to view the
available tag references. Using these
references, the clients can then arrange for
groups of tags to be synchronously updated at
defined intervals. Values may also be written
asynchronously to the server.
The block diagram overleaf shows how the
OPC Server fits between the Trusted
TM
hardware and one or more OPC client
applications.
The server OPC Server may be considered to
comprise three main functions. These are; the
Browse Interface, the OPC Server Group
Interface and the Communications Interface.
The server provides a list of tag
references that OPC clients can browse
in a standard manner. The root node is
the Trusted
TM Ethernet Interface. All
sub-items are groups, which are used to
configure and locate the tag names,
which may be located within them.
These tags are then identified by the full
path name of the tree.
When a client attaches to the server, a
unique server object is created within
the main Trusted
TM OPC server. The
client can create and edit groups within
this server object. Each group has a
number of tag references and an update
rate. Every time the tags are to be
updated, the server will inform the client
of the new values, quality, time, etc.
When the groups within an OPC server
request tag data is to be updated, the
tag references are passed to the
communications interface. This will
read the values from the appropriate
Trusted
TM Controller and will supply the
tag data back to the server groups.
Data can also be written to the tags.
The tag references and values are
passed to the communications interface,
which will then send the data to the
appropriate Trusted
TM Controller.
FEATURES
Industry standard
interface (OLE for
Process Control
V2.0)
Single or Dual
redundant link to a
Trusted
TM System
Handles multiple
Trusted
TM
Controllers
Update rate of up to
10ms
Events time
stamped to a
resolution of 1ms
Collects SOE and
Process Historian
data
Automatically
interfaces to
IEC1131
TOOLSET to obtain
tag references in
Trusted
TM
Controllers
On-line monitoring
of tag values
Customised tree
view of available
controllers
Runs as a Windows
Service