Protocol instance n dependent diagnostic communication counters are provided in the protection relay. These counters can be accessed via .
| 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.