Modbus TCP/IP counters can be viewed via the HMI path .
The counters show the complete Modbus protocol link frames and Modbus errors. The Ethernet communication driver maintains its own counters for lower level communication diagnostics.
| Counter | Description |
|---|---|
| Status | Shows the value "True" if the TCP/IP or serial instance is in use. This means that a Modbus client has connected to the TCP socket and Modbus TCP messages are received regularly at least at 15-second intervals or faster. In all other cases this value shows "False". |
| Reset counters | True = Reset all diagnostic counters |
| Received frames | Total amount of received Modbus frames. |
| Transmitted frames | Total amount of transmitted Modbus responses. |
| Transmitted exc A | Total amount of exception responses 1 and 2. These exception responses usually reveal configuration errors on the Modbus client’s side. |
| Transmitted exc B | Total amount of exception responses 3. These exceptions reveal the protection relay application level rejections. |
| Counter | Description |
|---|---|
| CnReject no sockets | The amount of connection requests that are rejected due to unavailable TCP sockets. |
| CnReject unregistered | The amount of connection requests that are rejected since the client is not registered. |