Watlow CAS - Manual (Page 67)

Setup
CAS User’s Guide 57
Setup Channel Alarms
The Setup Channel Alarms menu lets you access menus which change
alarm function parameters for the current channel. The main alarms
menu looks like this:
The CAS has three different kinds of alarms: failed sensor alarms,
global alarms, and process alarms.
Failed Sensor Alarms
Failed sensor alarms alert you to T/C breaks.
Global Alarms
Global alarms occur when a channel alarm is active and
unacknowledged, or when there are any unacknowledged failed sensor
alarms. (If an alarm occurs, the CAS front panel displays an appropriate
alarm code, see Chapter 4: Using the CAS.) Even if the alarm condition
goes away, the global alarm stays on until you use the front panel
Alarm Ack key (or ANASCAN) to acknowledge it.
Process Alarms
Process alarms include high and low deviation and high and low process
alarms. You can set each of these alarms to Off, Latched or Unlatched,
as shown here.
Function Description
Off No alarm
Latched Alarm is only cleared if it is in a Non-
Alarming state and the ALARM RESET
key is pressed. If ALARM ACKNOWL-
EDGE has not been previously pressed,
the ALARM RESET will acknowledge
the global alarm as well.
Unlatched Digital output activates on alarm, and
deactivates when channel is in a Non-
Alarming state. The ALARM ACK key
must be pressed to shut off the global
alarm.
CHANNEL PROCESS UNITS
CHANNEL NAME ALARM STATUS
SETUP CHANNEL 01
ALARMS ?