4

PLC Fault Table

The following table lists fault zoom Help text and messages for error codes associated with the redundancy fault group.

Table 8. Fault Zoom Help Text for Redundancy Error Codes

Error

 

 

 

Code

Message

FaultDescription

Corrective Action

 

 

 

 

 

 

 

 

1

Primary Unit is Active and

The primary and secondary units have

None required.

 

Secondary Unit is Backup.

switched roles.

 

 

 

 

 

2

Secondary Unit is Active and

The secondary and primary units have

None required.

 

Primary Unit is Backup.

switched roles.

 

 

 

 

 

3

Primary Unit is Active;

The primary unit has transitioned to RUN

Secondary unit MUST be placed in RUN mode with a

 

No Backup Unit Available.

mode and is running as a stand-alone unit.

comparable configuration

 

 

 

in order to have a synchronized system.

 

 

 

 

4

Secondary Unit is Active;

The secondary unit has transitioned to RUN

Primary unit MUST be placed in RUN mode with a

 

No Backup Unit Available.

mode and is running as a stand-alone unit.

comparable configuration

 

 

 

in order to have a synchronized system.

 

 

 

 

5

Primary Unit Has Failed;

Primary unit has recorded a fatal fault, has

If primary unit has also logged the fault ºSecondary

 

Secondary Unit is Active w/o

been powered down, or has lost

Unit Has Failed: Primary Unit is Activew/oBackupº,

 

Backup.

ability to communicate with the secondary

then communications has been broken between the

 

 

unit while acting as the active or backup unit.

two units and must be repaired. If a fatal fault has

 

 

Secondary unit will continue running as a

been logged in the primary unit, the indicated fault

 

 

stand-alone unit.

must be repaired. Power may have to be cycled on one

 

 

 

of the units in order to re-establish communications

 

 

 

and return to a synchronized system.

6

Secondary Unit Has Failed;

Secondary unit has recorded a fatal fault, has

If secondary unit has also logged the fault ºPrimary

 

Primary Unit is Active w/o

been powered down, or has lost ability to

Unit Has Failed: Secondary Unit is Activew/oBackupº,

 

Backup.

communicate with the primary unit while

then communications has been broken between the

 

 

acting as the active or backup unit. The pri-

two units and must be repaired. If a fatal fault has

 

 

mary unit will continue running as a stand-

been logged in the secondary unit, the indicated fault

 

 

alone unit.

must be repaired. Power may have to be cycled on one

 

 

 

of the units in order to re-establish communications

 

 

 

and return to a synchronized system.

7

Synchronization Failure; Both

A communications failure between

One of the units should be power cycled to return to a

 

Units are Active.

the two units has caused each unit to become

synchronized system. NOTE: The Genius blocks will

 

 

stand-alone units. Communications has since

respond to the unit that is using Serial Bus Address 31.

 

 

been restored.

 

 

 

 

 

8

Unable to Switch Redundancy

An attempt to switch redundancy roles was

None required.

 

Roles

made when it was not possible to perform the

 

 

 

switch.

 

 

 

 

 

9

Primary and Secondary Units

The local unit cannot be placed in RUN mode

Modify the configuration.

 

areIncompatible

when its redundancy configuration is incom-

 

 

 

patible with the remote unit. This error is

 

 

 

logged when (1) Store of an incompatible con-

 

 

 

fig is attempted and (2) going to RUN with an

 

 

 

incompatible config.

 

 

 

 

 

10

CPU to CPU communications

Synchronization protocol has been violated.

If this fault is also accompanied by an RCM failed fault,

 

terminated

 

replace the failed RCM: otherwise power cycle the CPU

 

 

 

or CPUs.

 

 

 

 

11

Redundant Link has timed out

The RCM has timed out while waiting on com-

Power cycle the back-up CPU (CPU not

 

 

munications from the other unit.

controlling the process); increase the fail wait time.

 

 

 

 

>11

CPU Redundancy Status has

A change in the status of the system has oc-

Corrective action to be taken depends on the error

 

Changed

curred. Press Ctrl-F to determine the error

code.

 

 

code.

 

57

Redundant link hard

The RCM has been faulted due to an error

Power cycle the rack with the faulted RCM. If the

 

failure occurred.

while accessing memory.

RCM's BOARD OK LED is on, replace the cable be-

 

 

 

tween the RCM and the BTM. If the RCM's BOARD

 

 

 

OK LED is off, replace the RCM.

74

Series 90-70 Hot Standby CPU Redundancy User's Guide ± December 1993

GFK-0827

Page 85
Image 85
State Industries GFK-0827 manual PLC Fault Table, Fault Zoom Help Text for Redundancy Error Codes