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n
OPC
requires a complex
DCOM
configuration.
n
OPC
requires separate complex firewall settings.
n
Scalable and platform-independent communication standard specified in IEC 62541.
n
Standardization of classic OPC specifications with integrated security concept.
n
The
OPC UA
security concept includes user and application authentication, message
signing, and encryption of transmitted data.
n
IP-based, optimized, binary protocol for Internet and firewall communication via one
port (4840).
n
With
OPC UA
, any type of information is available at any time and place for any
authorized application and authorized person. For example, raw data and prepro-
cessed information can be transported safely from the sensor and field level to the
control system and into the production planning systems.
n
SOA (
S
ervice
O
riented
A
rchitecture) replaces the Microsoft
DCOM
technology with
open, platform-independent protocols with integrated security mechanisms.
–
Communication takes place via standardized services based on the
Information
model
of OPC UA.
–
The services are divided into different task groups.
–
Based on a basic model, arbitrarily complex, object-oriented extensions of the
services can be carried out, without affecting interoperability.
n
An
OPC UA server
provides information within a network that can be retrieved from
an OPC UA client.
n
The data exchange can take place via security certificates, which have to be stored
accordingly in the server.
n
The
OPC UA server
provides basic services such as data exchange or navigation
through the address space.
n
The OPC UA configuration is used to define the variables or contents that an
OPC UA server should provide.
n
The OPC UA configuration is done via an external tool such as for CPUs from VIPA
the
OPC UA Configurator
from VIPA.
OPC UA clients
are programs with the following functionality:
n
Read or write access to information of the OPC UA server.
n
Access is controlled by access rights.
n
Execute services on the OPC UA server.
n
Client/Server
–
An
OPC UA client
accesses information from the
OPC UA server
via services,
provided by the
OPC UA server
. Here a fix defined connection is used.
–
Example:
OPC UA client
retrieves status of an input in the CPU.
n
Publisher/Subscriber
–
A
Publisher
sends to unknown
Subscriber
(clients) without a fixed connection.
–
Example: Sensors send data to the cloud.
7.2.2 Information modeling
n
Information models
are used to describe devices and their data.
n
The basis is the
Core specification
. The
Core specification
describes the structure of
the address range and of the services, such as the entry points for the clients in the
address space of an
OPC UA
server.
OPC UA - Open Platform
Communications Unified
Architecture
OPC UA server
OPC UA client
Communication types
Information model
VIPA System SLIO
Deployment OPC UA
Basics OPC UA > Information modeling
HB300 | CPU | 013-CCF0R00 | en | 19-30
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