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1MRS755385
Communication Gateway
User’s Guide
COM 610 *2.1
2.5.1.
OPC server
This chapter describes a structure of a typical OPC server component developed for
the Gateway. OPC server component consists of Master/Client Protocol Stack, OPC
DA/AE Server and Configuration SCL. Protocol stack component implements the
protocol functions, such as handshaking signal handling, message coding/decoding,
check sum calculations, polling logic, protocol level timers etc. OPC server/protocol
handler implements the functionality for publishing and updating data on the OPC
interfaces and protocol conversion between the OPC and the protocol stack using the
common IEC 61850 data model. The configuration of the OPC server and the
protocol stack is handled using a configuration parser. Configuration of the OPC
server is done using engineering tool. The configuration information is exported to
the SCL/XML configuration file according the IEC 61850 SCL specification. When
the OPC server is started the configuration information is read from the file.
ServerConcept_a
Fig. 2.5.1.-1
Conceptual view of OPC server
2.5.2.
OPC client
This chapter describes a structure of a typical OPC client component developed for
the OPC Gateway. OPC client software consists of Slave/Server Protocol Stack,
OPC DA Client, Configuration SCL, OPC Data Access Server and Alarm&Event
server components for diagnostic and control. Protocol stack component
implements the protocol functions, such as handshaking signal handling, message
coding/decoding, check sum calculations, polling logic, protocol level timers etc.
OPC client/protocol handler implements the functionality for data subscription
from the OPC servers and protocol conversion between the OPC and the protocol
stack using the common IEC 61850 data model. The configuration of the OPC client
and the protocol stack is handled using a configuration SCL. Configuration of the
OPC server is done using engineering tool. The configuration information is
Configuration
SCL
SCL
OPC DA Client
GW
Management
Configuration
Diagnostics
OPC Server/
Protocol
Handler
DA
Server
AE
Server
Master/Client Protocol Stack
CET
Gateway