Chapter 14 635
Analyzer Messages
Interpreting Analyzer Messages
The I/O Data-Bus Failure Code.
The next four digits identify failed data lines on the I/O data bus.
Convert the four digits to binary and interpret them with Table 14-5.
Table 14-5 I/O Data Bus Failure Code Interpretation
Digits From
Example
Equivalent
Binary Value
A16 Circuit Tested A16 Reference
Designator
8 Error at IOB 15 U3
4 Error at IOB 14 U3
2 → 2 Error at IOB 13 U3
1 Error at IOB 12 U3
8 Error at IOB 11 U3
5 → 4 Error at IOB 10 U3
2 Error at IOB 9 U3
→ 1 Error at IOB 8 U3
C → 8 Error at IOB 7 U2
4 Error at IOB 6 U2
2 Error at IOB 5 U2
1 Error at IOB 4 U2
8 Error at IOB 3 U2
4 Error at IOB 2 U2
2 Error at IOB 1 U2
1 → 1 Error at IOB 0 U2
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