AN24 & AN28 Annunciators
Instruction Manual
6
Specifications
Except where noted all specifications apply to operation at +25°C.
General
Display
AN24; Four red LED channel/point
indicators.
AN28; Eight red LED channel/point
indicators.
One green LED power indicator.
Alarm
Messages
Custom printed adhesive clear labels.
AN24 Area: 1.25" x .60" (32 mm x 15 mm),
4 messages
AN28 Area: 1.25" x .25" (32 mm x 6 mm),
8 messages
Up to 4 lines (AN24) or 2 lines (AN28) of 14
characters of size 9 fonts.
Programming
Methods
Rear 4-position switch for sequence
selection and horn operation. Three front
panel pushbuttons for NO/NC input
selection, sequence options, and sequence
operation.
Noise Filter
40 ms debounce on inputs (including SIL,
ACK, and RST).
Shared First-
Out Systems
1 ms unit-to-unit delay. Maximum of 200
units in the shared first-out system.
Non-Volatile
Memory
All programmed settings are stored in non-
volatile memory for a minimum of ten years
if power is lost.
Power
Options
85-265 VAC, 50/60 Hz,
90-265 VDC, 20 W max
or 12-36 VDC, 12-24 VAC, 6 W max
Fuse
Required external fuse: UL Recognized,
5 A max, slow blow. Up to 6 annunciators
may share one 5 A fuse
Isolated
Power Supply
24 VDC
10% @ 200 mA max
Standard on 85-265 VAC powered units only.
Isolation
4 kV input/output-to-power line.
Overvoltage
Category
Installation Overvoltage Category II:
Local level with smaller transient
overvoltages than Installation Overvoltage
Category III
Environmental
Operating temperature range: -40 to 65°C
Storage temperature range: -40 to 85°C
Relative humidity: 0 to 90% non-condensing
Connections
Removable screw terminal blocks for 12 to
22 AWG wire.
Enclosure
1/8 DIN, high impact plastic, UL 94V-0,
front color: black
Mounting
1/8 DIN panel cutout required. Two panel
mounting bracket assemblies provided.
Tightening
Torque
Screw terminal connectors:
5 lb-in (0.56 Nm)
Overall
Dimensions
4.68" x 2.45" x 4.19"
(62 mm x 119 mm x 106 mm) (H x W x D)
Weight
9.6 oz (272 g)
Warranty
3 years parts and labor. See Warranty
Information and Terms & Conditions on
for complete details.
Input
Input Types
NO or NC switches: No external
excitation required
Open collector transistor (NPN):
Open circuit voltage approximately
3.3 VDC
Logic Levels: LOW = 0 to 0.9 VDC
HIGH = 2.4 to 28 VDC
Update Rate
41 ms following alarm state;
1 ms for alarm state clear
Sequences
Input follower, ISA Sequences A, F1A,
F2A, F3A, M, F1M, F2M and F3M per
ISA Standard ISA-18.1-1979 R2004.
Sequence
Options
A, F1A, F2A, F3A, M, F1M, F2M, and
input follower with selectable options
-1 (silence pushbutton), -4 (no lock-in),
and -6 (no horn) per ISA Standard
ISA-18.1-1979 R2004.
Relays
Rating
2 SPDT (Form C); rated 3 A @ 30 VDC
or 3 A @ 250 VAC resistive load;
1/14 HP @ 125/250 VAC for inductive
loads
Electrical Noise
Suppression
A snubber should be connected to each
relay contact switching inductive loads
to prevent disruption to the
microprocessor’s operation.
Recommended snubber value:
0.01 µF/470
, 250 VAC (PMA-09).
Relay
Operation
Relay 1: Alarm state until alarm is
acknowledged.
Relay 2: Alarm state while any channel
indicating alarm condition.
Fail-Safe
Operation
Programmable
Independent for each relay
Note:
In fail-safe mode, relay coil is
energized in non-alarm condition. In
case of power failure, relay will go to
alarm state.
