B-10 Series 90-30/20/Micro Programmable Controllers Reference Manual – September 1998 GFK-0467K
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
3Loss of, or missing, I/O module. Diagnostic
7Addition of, or extra, I/O module. Diagnostic
9IOC or I/O bus fault. Diagnostic
AI/O module fault. Diagnostic
– Additional I/O fault codes. As specified