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INM MTL SUM5 Rev 7
DRAFT - 09 June 2021 DRAFT - 09 June 2021
29 ALARM SEQUENCES
Within the annunciator market a common standard has been adopted by all key
manufacturers and end users with regards to operational sequences. These standards are
used worldwide to dene the visual indication, audible alarm and the action the operator
must take to control the annunciator.
The Instrument Society of America provide full details of each alarm sequence within ISA
18.1-1979 (R1992) and Eaton are fully compliant with the stated sequences. The most
common sequences are detailed within this section of the manual.
To dene a sequence the user can simply select any of the listed ISA sequences.
29.1 Pushbuttons
Four integral pushbuttons and ve remote pushbutton inputs are provided on the
annunciator unit to allow the user to be able to control any of the available sequences
which can be set on a per channel basis.
29.2 Functional Test
Is used to simulate an input on all channels and therefore all windows and horn circuits
will operate in accordance with the selected ISA sequence and additional pushbuttons
will need to be pressed to step through the alarm sequence to return the unit to its
normal state.
29.3 Mute
Is used to silence the audible alarm whilst allowing the associated alarm window to
continue to operate in accordance with the selected ISA sequence.
29.4 Acknowledge
Is used to silence the alarm and change the state of the associated alarm window in
accordance with the selected ISA sequence.
29.5 Reset
Is used to return the alarm to the normal off state once the Input has returned to the
normal condition.
As an option functional test can be replaced by Lamp Test and Reset can be replaced by
First Reset if required.
29.6 Audible Alarms
Each channel within the annunciator can be set to operate either of the two integral
audible alarms or they can be assigned to common relays congured as horn relays as
required.
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