5

Configurable Faults

The table below shows the configurable faults and their fault action defaults. There are three fault actions: Fatal, Non-Fatal, and Conditionally Fatal. Fatal always stops the PLC, Non-Fatal never stops the PLC and Conditionally Fatal stops the PLC depending on other information in the fault. Note that Non-Fatal and Diagnostic have the same meaning.

 

 

 

Not Synchronized

Synchronized

 

Table

 

Fault Action

Fault Action

 

 

 

 

 

 

 

 

Default

Configurable

(fixed)

Fault Group

Type

Description

 

 

 

 

 

 

 

 

 

LOSS_RACK

PLC

Loss of or Missing Rack

Non-Fatal

Yes

Fatal

 

 

 

 

 

 

LOSS_IOC

I/O

Loss of or Missing IOC

Non-Fatal

Yes *

Fatal

 

 

 

 

 

 

LOSS_IO_MOD

I/O

Loss of or Missing I/O Module

Non-Fatal

Yes

Non-Fatal

 

 

 

 

 

 

LOSS_OTHR_MOD

PLC

Loss of or Missing Option Module

Non-Fatal

Yes

Non-Fatal

 

 

 

 

 

 

SYS_BUS_ERROR

PLC

System Bus Error

Fatal

Yes

Fatal

 

 

 

 

 

 

IOC_FAULT

I/O

IOC or I/O Bus Fault

Non-Fatal

Yes

Conditionally Fatal

 

 

 

 

 

 

CNFG_MIS_MTCH

Both

System Configuration Mismatch

Fatal

Yes

Non-Fatal

 

 

 

 

 

 

IOC_SOFTWR

I/O

IOC Software Failure

Fatal

Uses LOSS_IOC

Conditionally Fatal

 

 

 

 

setting

 

 

 

 

 

 

 

The two fault groups IOC_FAULT and IOC_SOFTWR faults are fatal to the system (force the PLC to STOP FAULT mode) if the fault is Fatal to the Genius Bus Controller that logged the fault. When a module logs a fault it notifies the PLC whether or not it can continue by placing Fatal or Diagnostic in the fault action of the fault entry. The PLC shuts the Genius Bus Controller down on all Fatal faults.

*Even if the LOSS_IOC fault is configured as Fatal for non-synchronized operation, the PLC will not go to STOP/FAULT mode unless both Genius Bus Controllers of a dual bus pair fail.

5-8

Series 90™-70 Enhanced Hot Standby CPU Redundancy User's Guide – May 2000

GFK-1527A

Page 72
Image 72
GE 90-70 manual Configurable Faults, Fault Group Type Description