GE 90-70 PLC Fault Table Messages for Redundancy, Message Fault Description Corrective Action

5

PLC Fault Table Messages for Redundancy

The following table lists messages, descriptions, and corrective actions for error codes associated with the redundancy fault group. These error codes can be viewed by selecting Ctrl-F on the corresponding redundancy fault (in Logicmaster 90-70) or double-click on the corresponding fault (in Control). The entire fault data (including these error codes) can also be accessed with a SVC_REQ and other applications that communicate with the CPU.

Error
Code	Message	Fault Description	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	The secondary and primary units have	None required.
	and Primary Unit is	switched roles.
	Backup.
3	Primary Unit is Active; No	The primary unit has transitioned to RUN	Secondary unit MUST be placed in RUN
	Backup Unit Available.	mode and is running as a stand-alone unit.	mode with a 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
	No Backup Unit Available.	mode and is running as a stand-alone unit.	mode with a 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
	Secondary Unit is Active	been powered down, or has lost ability to	“Secondary Unit Has Failed: Primary Unit
	w/o Backup.	communicate with the secondary unit while	is Active w/o Backup”, then
		acting as the active or backup unit.	communications has been broken between
		Secondary unit will continue running as a	the two units and must be repaired. If a
		stand-alone unit.	fatal fault has been logged in the primary
			unit, the indicated fault 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
	Primary Unit is Active w/o	been powered down, or has lost ability to	“Primary Unit Has Failed: Secondary Unit
	Backup.	communicate with the primary unit while	is Active w/o Backup”, then
		acting as the active or backup unit. The	communications has been broken between
		primary unit will continue running as a	the two units and must be repaired. If a
		stand-alone unit.	fatal fault has been logged in the secondary
			unit, the indicated fault 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;	A communications failure between the two	One of the units should be power cycled to
	Both Units are Active.	units has caused each unit to become stand-	return to a synchronized system. NOTE:
		alone units. Communications has since been	The Genius blocks will respond to the unit
		restored.	that is using Serial Bus Address 31.
8	Unable to Switch	An attempt to switch redundancy roles was	None required.
	Redundancy Roles	made when it was not possible to perform
		the switch.

GFK-1527A Chapter 5 Fault Detection 5-3