GE 90-30/20/Micro manual Fault Address, Table B-8. I/O Reference Address

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.

GFK-0467K Appendix B Interpreting Fault Tables B-9