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4.1.6 Diagnostic parameter register
The diagnostic parameter register provides additional information on the error indicated in
the diagnostic status register. The following information is stored in the diagnostic
parameter register:
– Error location
– Error code
The diagnostic parameter register is rewritten whenever an error occurs. The diagnostic
parameter register contains the value “0” if no errors are detected.
Figure 4-1 Error location in the master diagnostic
parameter register
Figure 4-2 Error code in the master diagnostic
parameter register
15 8 7 0
Position in the segment Segment number
3
1
Example: device number 3.1
6219B040
15 8 7 0
Position in the segment Segment number
3 1
Example: device number 3.1
6219B040
0 5
Error code
15 0 7 8
Example: address overlap, code 0A50
hex
6219B041
A 0
Special case: if an interface error cannot be located, the value 128 is indicated in the
diagnostic parameter register, i.e., bit 7 is set.
Table 4-4 Error code (example: 0A50
hex
)
Error code: Type: Description and remedy
0A50 USER Error when assigning a process data item. Input or output
address assigned more than once.
Remedy: always assign just one process data item to each
input/output address.
Add_Error_Info: PDRL_Index of the incorrect PDRL entry
Table 4-5 System variables of the diagnostic parameter register
System variable Type Meaning
MASTER_DIAG_PARAM_REG WORD Error location (for a bus error) or error code
MASTER_DIAG_PARAM_REG_HI BYTE Diagnostic parameter register, high byte
MASTER_DIAG_PARAM_REG_LOW BYTE Diagnostic parameter register, low byte
MASTER_DIAG_PARAM_2_REG_HI BYTE Extended diagnostic parameter register, high byte
MASTER_DIAG_PARAM_2_REG_LOW BYTE Extended diagnostic parameter register, low byte