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GFK-0467K Appendix B Interpreting Fault Tables B-9
B
The following paragraphs describe each field in the I/O fault table. Included are tables describing
the range of values each field may have.
Long/Short Indicator
This byte indicates whether the fault contains 5 bytes or 21 bytes of fault specific data.
Table B-7. I/O Fault Table Format Indicator Byte
Type Code Fault Specific Data
Short 02 5 bytes
Long 03 21 bytes
Reference Address
Reference address is a three-byte address containing the I/O memory type and location (or offset) in
that memory which corresponds to the point experiencing the fault. Or, when a Genius block fault
or integral analog module fault occurs, the reference address refers to the first point on the block
where the fault occurred.
Table B-8. I/O Reference Address
Byte Description Range
0 Memory Type 0 – FF
1–2 Offset 0 – 7FF
The memory type byte is one of the following values.
Table B-9. I/O Reference Address Memory Type
Name Value (Hexadecimal)
Analog input 0A
Analog output 0C
Analog grouped 0D
Discrete input 10 or 46
Discrete output 12 or 48
Discrete grouped 1F
I/O Fault Address
The I/O fault address is a six-byte address containing rack, slot, bus, block, and point address of the
I/O point which generated the fault. The point address is a word; all other addresses are one byte
each. All five values may not be present in a fault.
When an I/O fault address does not contain all five addresses, a 7F hex appears in the address to
indicate where the significance stops. For example, if 7F appears in the bus byte, then the fault is a
module fault. Only rack and slot values are significant.