Справочник Пользователя для Marathon Computer AACC 2000

AACC 2000 Carbon                                                                       Nov.  1, 1997

44

 Alarms

 

 

Alarms are flashed as messages in the Home display.   A new alarm is displayed as a
double flash followed by a pause, old (acknowledged) alarms as a single flash followed
by a pause.  If there is more than one alarm condition, the display cycles through all the
relevant alarm messages.  Table 2-1 and Table 2-2 list all of the possible alarm messages
and their meanings.

 

 

Pressing both 

 and 

 at the same time will acknowledge any new alarms and reset

any latched alarms.

 

 

Alarms will have been set up to operate in one of several modes, either:

•

 Non-latching, which means that the alarm will reset automatically when the Process

Value is no longer in the alarm condition.

•

 Latching, which means that the alarm message will continue to flash even if the

alarm condition no longer exists and will only clear when reset.

•

 Blocking, which means that the alarm will only become active after it has first

entered a safe state on power-up.

 

 

There are two types of alarm: Process alarms and Diagnostic alarms.

 

 

These warn that there is a problem with the process which the controller is trying to
control.

 

 

 

 

_

FSL*

 

PV Full Scale Low alarm

 

_

FSH*

 

PV Full Scale High alarm

 

_

dEv*

 

PV Deviation Band alarm

 

_

dHi*

 

PV Deviation High alarm

 

_

dLo*

 

PV Deviation Low alarm

 

_

LCr*

 

Load Current Low alarm

 

p.FLt

 

Probe impedance test

 

fault.

 

 

 

Table 2-1  Process alarms

 

 

 

_

FL2*

 

Input 2 Full Scale Low
alarm

 

_

FH2*

 

Input 2 Full Scale High
alarm

 

_

LOP*

 

Working Output Low
alarm

 

_

HOP*

 

Working Output High
alarm

 

_

LSP*

 

Working Setpoint Low
alarm