Section 3 Vendor-specific implementation
3.1 Protocol server instances
The word "client" refers to the protocol master. The protection relay is
referred to as "server" or a slave device.
The protection relay can communicate with several protocol clients simultaneously.
Furthermore, it is possible to configure the protection relay to provide different
protocol data and data outlook for different clients. A protocol server communication
entity which is configured to operate against a specific master or client is called an
instance.
There are three server instance scenarios.
1. One client - One protocol instance - One protocol mapping. The protection relay
is intended to operate toward one protocol client. The default protocol data
mapping or data outlook can be modified freely.
2. Several clients - Several protocol instances - One protocol mapping. The
protection relay is intended to operate toward several protocol clients. All the
clients should be able to access exactly similar data or similar data outlook. The
default protocol mapping or data outlook can be modified freely.
3. Several clients - Several protocol instances - Several protocol mappings. The
protection relay is intended to operate toward several protocol clients. Some or all
of the clients may want to access protocol data in a different manner. For this
purpose, several protocol mappings derived from the default protocol mapping
need to be prepared.
3.1.1 Connection to clients
In the protection relay, it is possible to activate up to five protocol server instances. A
function block represents the protocol on the protection relay’s application
configuration level. The block is named DNPLPRT1...5, depending on the instance in
use. For each connected client, an instance has to be activated by dragging the function
block to the configuration in the PCM600 Application Configuration tool.
GUID-536D5DBA-B53F-475B-AD7D-25515895935C V1 EN
Figure 2: Function block
1MRS758757 A Section 3
Vendor-specific implementation
REC615 and RER615 9
Communication Protocol Manual
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