model 2704 controller installation and operation handbook - Soliton

Alarm Operation
2704 Controller
7. Chapter 7 ALARM OPERATION
7.1. DEFINITION OF ALARMS AND EVENTS
Alarms are used to alert an operator when a pre-set level or condition has been exceeded.
They are normally used to switch an output - usually a relay - to provide interlocking of the
machine or plant or external audio or visual indication of the condition.
Soft Alarms are indication only within the controller and are not attached to an output
(relay).
Events - can also be alarms - but are generally defined as conditions which occur as part of
the normal operation of the plant. They do not generally require operator intervention. An
example might be to open/close a vent during a programmer cycle.
The controller does not display the alarm status on the front panel.
For the purposes of the operation of this controller, alarms and events can be considered the
same.
7.1.1. Customisable Parameter Names
Throughout this chapter parameter names shown in italics are customisable by the user
when in configuration access level. The name of the parameter may vary, therefore,
from instrument to instrument.
Typical customisable parameter names are:
Alarm names
Loop names
Module and input names
Custom units
Promoted parameters
7-2 Installation and Operation Handbook. Part No HA026502 Issue 1.0 Apr-00