Festo MSE6-E2M Original Instructions Manual page 95

8 Diagnostics and error handling
Mode of operation of I/O diagnostic interface
Detailed diagnostic information can be accessed via the I/O diagnostic interface. For example, you can
ascertain exactly on which module an error has occurred. 16 input bits and 16 output bits, through
which all diagnostic data can be retrieved, are available for accessing the system diagnostics.
The addresses of the input and output bits of the I/O diagnostic interface depend on the
network used (è description for the specific CPX bus node).
Output bits
The function number of the desired data is specified in binary coded form using the output bits A0 ...
A12 of the I/O diagnostic interface. The function number is applied when control bit A15 supplies a
logic 1.
15
1
2
Control bit
1
Bit number
Fig. 8.3 Output bits of the I/O diagnostic interface
Input bits
The reply data is output by the MSE6-E2M via the input bits E0 ... E7 when the acknowledgement bit
E15 supplies a logic 1.
15
1
2
Acknowledgement bit
1
Bit number
Fig. 8.4 Input bits of the I/O diagnostic interface
If control bit A15 supplies a logic 0, acknowledgement bit E15 will be reset automatically and the status
byte will be shown with the diagnostic data bits.
Festo – MSE6-E2M-SY-EN – 1703d – English
14 13 12 11 10
Reserved
14 13 12 11 10
Reserved
9 8 7 6
Function number
2
Outputs
9 8 7 6
2
inputs
5 4 3 2 1
5 4 3 2 1
Diagnostic data
0
0
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