Fieldbus system
BC9000 and BC9100 71Version: 4.0.0
7.5.4.8 Diagnosis (Function 8)
The diagnosis function provides a series of tests for checking the communication system between the
master and the slave and for examining a variety of internal error states within the slave. A broadcast
telegram is not supported.
The function uses two bytes in the query to specify a sub-function code defining the test that is to be carried
out. The slave returns the function code and the sub-function code in the response.
The diagnostic queries use a two-byte data field to send diagnostics data or control information to the slave.
Query
Byte name Sample
Function code 8
Sub-function high 0
Sub-function low 0
Data high 2
Data low 3
Response
Byte name Sample
Function code 8
Sub-function high 0
Sub-function low 0
Data high 2
Data low 3
Echo a request (Subfunction 0)
Subfunction 0 causes the data that is sent to the slave by the master to be returned.
Coupler reset (Subfunction 1)
The coupler is reset with sub-function 1, error counters are reset and the controller performs a self-test. No
telegrams are either received or sent while the controller is being reset. The IP socket is closed.
Last reply with the sub-function 1
Before the Controller restarts it sends a reply with sub-function 1, after which the IP socket is
closed.
Sub-function Data field (query) Data field (response)
0x0001 0x0000 0x0000
Delete all counter contents (sub-function 10)
When this sub-function is called the controller clears all error counters.
Sub-function Data field (query) Data field (response)
0x000A 0x0000 Echo query data
Bus Communication Answer Counter (Subfunction 11)
Returns the number of communication answers.
Sub-function Data field (query) Data field (response)
0x000B 0x0000 Counter value
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