GE 90-30/20/Micro manual Table B-1. PLC Fault Groups

B

PLC Fault Group

Fault group is the highest classification of a fault. It identifies the general category of the fault.

Table B-1 lists the possible fault groups in the PLC fault table.

The last non-maskable fault group, Additional PLC 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 PLC-type alarm codes belong to this group.

Table B-1. PLC Fault Groups

Group Number
Decimal	Hexadecimal	Group Name	Fault Action
1	1	Loss of, or missing, rack.	Fatal
4	4	Loss of, or missing, option module.	Diagnostic
5	5	Addition of, or extra, rack.	Diagnostic
8	8	Addition of, or extra, option module.	Diagnostic
11	B	System configuration mismatch.	Fatal
12	C	System bus error.	Diagnostic
13	D	PLC CPU hardware failure.	Fatal
14	E	Non-fatal module hardware failure.	Diagnostic
16	10	Option module software failure.	Diagnostic
17	11	Program block checksum failure.	Fatal
18	12	Low battery signal.	Diagnostic
19	13	Constant sweep time exceeded.	Diagnostic
20	14	PLC system fault table full.	Diagnostic
21	15	I/O fault table full.	Diagnostic
22	16	User Application fault.	Diagnostic
–	–	Additional PLC fault codes.	As specified
128	80	System bus failure.	Fatal
129	81	No user’s program on power-up.	Informational
130	82	Corrupted user RAM detected.	Fatal
132	84	Password access failure.	Informational
135	87	PLC CPU software failure.	Fatal
137	89	PLC sequence-store failure.	Fatal

B-4 Series 90-30/20/Micro Programmable Controllers Reference Manual–September 1998 GFK-0467K