9.2.5 Function code 8, diagnosis
Example 1a:
Deleting of all diagnosis counters (sub-function 0x0A) in frequency inverter with address 1.
Request: Master frequency inverter
Field:
Unit ID Func. Sub-function Data
Response: Frequency inverter Master
Field:
Unit ID Func. Sub-function Data
The response is the reflected signal of the request message. All counters are set to zero.
Example 1b:
With all counters set to zero, reading of diagnosis counter 4 “Slave Messages Counter” (sub-function
0x0E) of frequency inverter with address 1.
Request: Master frequency inverter
Field:
Unit ID Func. Sub-function Data
Response: Frequency inverter Master
Field:
Unit ID Func. Sub-function Data
Counter value is 1 because this is the first message received after resetting of all counters to zero.
Example 2:
Reading of unknown diagnosis counter 8 (sub-function 0x13) of frequency inverter with address 1.
Request: Master frequency inverter
Field:
Unit ID Func. Sub-function Data
Error response: Frequency inverter Master
Field:
Unit ID Func. Excep.
The sent exception condition code is the hexadecimal value 0x01 = INVALID FUNCTION CODE.
10/13
ACU
Modbus/TCP 51
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