CSLS error and response summary

The following table summarizes the evidence and action needed when the various classes of errors (fatal and non-fatal) occur in simplex and redundant CSLSs. The table shows the state of alarm and diagnostic parameters approximately five minutes after the error is detected.

Table: *Summary of the Evidence of CSLS Errors and the Needed Action*
Error Type	Simplex CSLS		Redundant CSLS
Error Type	Evidence	Action	Evidence	Action
Non-Fatal, Momentary	Inact-Unack alarm (MAINT and/or ADVISE)	Acknowledge the alarm(s). Check Event Chronicle records to determine error condition. Record error occurrence; report to Emerson if there is a repeat occurrence.	(error on active and /or standby CSLS unit) Inact-Unack alarm (MAINT and/or ADVISE)	Acknowledge the alarm(s). Check Event Chronicle records to determine error condition and affected CSLS unit(s). Record error occurrence; report to Emerson if there is a repeat occurrence.
Non-Fatal, Persistent	Act-Unack alarm (MAINT and/or ADVISE)	Acknowledge the alarm(s). Check _ALERTS parameter associated with alarm to determine error condition. Report error to Emerson.	(error on active and /or standby CSLS unit) Act-Unack alarm (MAINT and/or ADVISE)	Acknowledge the alarm(s). Check _ALERTS parameter associated with alarm to determine error condition. Check _STATUS parameters on both CSLS units to determine affected one. Report error to Emerson.
Fatal, Momentary	Inact-Unack COMM_ALM	Acknowledge the alarm. Restart the process at the appropriate time. Check PAST_ERROR on card to determine error condition. Report error to Emerson.	(error on standby CSLS unit) Inact-Unack MAINT_ALM	Acknowledge the alarm. Check PAST_ERROR on Standby unit to determine error condition. Report error to Emerson.
Fatal, Momentary	Inact-Unack COMM_ALM		(error on active CSLS with faulty standby) Inact-Unack COMM_ALM, Act-Unack MAINT_ALM	Acknowledge the alarms. Check PAST_ERROR on active unit to determine error condition. Report error to Emerson
Fatal, Persistent	Inact-Unack COMM_ALM Act-Unack FAILED_ALM DIAG_STATUS on CSLS includes Persistent Fatal Error After Powerup.	Acknowledge the alarm(s). Check PAST_ERROR on CSLS to determine error condition. Do a manual reset of the unit, replace CSLS if necessary. Report error to Emerson.	(error on standby CSLS unit) Act-Unack MAINT_ALM DIAG_STATUS on Standby CSLS includes Persistent Fatal Error After Powerup.	Acknowledge the alarm(s). Check PAST_ERROR on Standby CSLS to determine error condition. Do a manual reset of Standby unit; replace standby CSLS if necessary. Report error to Emerson.
Fatal, Persistent			(error on active CSLS with faulty standby) Inact-Unack COMM_ALM, Act-Unack FAILED_ALM Act-Unack MAINT_ALM DIAG_STATUS on active CSLS includes Persistent Fatal Error After Powerup.	Acknowledge the alarm(s). Check PAST_ERROR on both CSLS units to determine error conditions. Do a manual reset of both CSLS units; replace both units if necessary. Report error to Emerson