GE 90-30/20/Micro manual Point, Table B-10. I/O Fault Groups

B

Rack

The rack number ranges from 0 to 7. Zero is the main rack, i.e., the one containing the PLC. Racks 1 through 7 are expansion racks.

Slot

The slot number ranges from 0 to 9. The PLC CPU always occupies slot 1 in the main rack (rack 0).

Point

Point ranges from 1 to 1024 (decimal). It tells which point on the block has the fault when the fault is a point-type fault.

I/O Fault Group

Fault group is the highest classification of a fault. It identifies the general category of the fault. The fault description text displayed by Logicmaster 90-30/20/Micro software is based on the fault group and the error codes.

Table B-10 lists the possible fault groups in the I/O fault table. Group numbers less than 80 (Hex) are maskable faults.

The last non-maskable fault group, Additional I/O Fault Codes, is declared for the handling of new fault conditions in the system without the PLC having to specifically know the alarm codes. All unrecognized I/O-type alarm codes belong to this group.

Table B-10. I/O Fault Groups

Group Number	Group Name	Fault Action
3	Loss of, or missing, I/O module.	Diagnostic
7	Addition of, or extra, I/O module.	Diagnostic
9	IOC or I/O bus fault.	Diagnostic
A	I/O module fault.	Diagnostic
–	Additional I/O fault codes.	As specified

B-10 Series 90-30/20/Micro Programmable Controllers Reference Manual–September 1998 GFK-0467K