Use of TCP/IP connection keep-alive timeout only
When the DNP3 link keep-alive mechanism is not used in TCP/IP case, the Ethernet
stack TCP socket keep-alive mechanism is still in use. If there is a TCP socket keep-
alive timeout, the protection relay closes the associated TCP socket connection and
updates the DNP3 link status.
3.3.5.2 Diagnostic communication counters
Protocol instance n dependent diagnostic communication counters are provided in the
protection relay. These counters can be accessed via Monitoring/Communication/
DNP3.0/DNP3.0n.
Table 1: Diagnostic communication counters
Diagnostic counter Description
Received frames Total amount of received DNP3 frames
Transmitted frames Total amount of transmitted DNP3 frames
Physical errors Total amount of Physical layer errors noticed
Link errors Total amount of Link layer errors noticed
Transport errors Total amount of Transport layer errors noticed
Mapping errors Total amount of Protocol mapping errors noticed
Status Shows the value "True" if the TCP/IP or serial
instance is active. This means that a DNP3 client
has connected to the TCP socket and DNP3
messages are received regularly at least within
<Link keep-alive> second interval or faster. In all
other cases this value shows "False".
Reset counters
True = Reset all diagnostic counters
For non-activated instances n, no communication diagnostic values are shown by the
HMI. Diagnostic counter values are initially set to “-1” to indicate that no messages
have yet been processed by the active instance. As soon as a message is received or
transmitted, the counters initialize to “0”.
In a serial-bus troubleshooting case, if no DNP3 diagnostic counter is running, the
COMn serial driver settings and driver diagnostic counters should be checked.
3.4 Data objects
3.4.1 Readable data objects
DNP3 data objects in the protection relay are all unmapped as default. Using the
Communication Management tool in PCM600, the objects can be freely added and
located into the DNP3 memory map.
1MRS758757 A Section 3
Vendor-specific implementation
REC615 and RER615 15
Communication Protocol Manual
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