the IED can have only five client connections in total, regardless of the protocols to
which the clients belong. This includes the MMS clients and other communication
protocol clients.
Protocol instances are identified with numbers 1...5. There are different and unique
setting and monitoring parameters for each instance in the HMI menu. Instance
numbers can be freely used. However, it is recommended to use the instances in the
numerical order. For example, instance 1 is to be used if there is only one client
connection and instances 1 and 2 when there are two clients.
3.1.2
Protocol server attachment to a client
After its activation, an instance should be attached to the intended client.
If the client is in a serial connection, the instance must be attached to the intended
serial port.
In case of a TCP client, the instance must be first attached to the physical Ethernet port.
If there are several TCP client connections, the IED must be able to distinguish
between the clients. There are two setting parameters in an instance.
•
Client IP
: When the client makes the TCP connection, its IP address is checked.
This instance is given to the client with this IP address. It is also possible to use
the address “0.0.0.0” if no client IP address is to be defined. In this case, the
client's IP address is ignored.
•
TCP port
: This parameter can be used in conjunction with the
Client IP address
setting, thus allowing only a certain IP address at a specific TCP socket port
number.
3.1.3
Several identical client connections
If several clients access the same protocol data, the client connections must still be
kept apart. Also the number of each instance used for each client must be noted so that
if there are problems with the communication, the line diagnostic data for instances
follows the same instance number rule.
In case of sequential event data transaction and a TCP client connection, it is essential
that a reconnecting client is given back the same instance to which it was attached
before disconnecting. This way, the event reading resumes from the point where the
client left off, provided that no event overflow has occurred while the client was
absent. If multiple client connections are used, the distinguishing between different
client connections must be ensured by using the
Client IP
and
TCP port
parameters.
3.1.4
Protocol data mapping to server instances
There can be N number of different data mappings for a protocol. The mappings are
identified and numbered, starting from one. This number is not related to the protocol
instance number.
Section 3
1MRS757645 B
Vendor-specific implementation
14
620 series
Communication Protocol Manual
