12
Visual alarm
indication
The state of the alarm channel is indicated by
super-bright LEDs. A legend plate of transpar-
ent film is inserted in a slot at the edge of the
also transparent plastic overlay. For more infor-
mation, see section "Legend plate", page 29.
Acknowledge and reset is done with a push-but-
ton located on in module SWDM 3A1 located,
if included, to the left in the rack or with two
external push-button. The reset indicator LEDs
on the front panel marked SILENCE, ACK,
RESET/TEST shows which of the actions is to
be performed. The reset sequence depends on
the operational sequences.
FAULT
ON
PROGRAM
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
TEST
RESET
ACK
SILENCE
FAULT
ON
PROGRAM
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
FAULT
ON
PROGRAM
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
FAULT
ON
PROGRAM
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
SACO 16D2
SACO 16D2
SACO 16D2
SACO 16D2
Channel window with
indicator LED and
legend text
PROGRAM
ON
FAULT
SILENCE
ACKNOWLEDGE
RESET
TEST
Fig. 9. Alarm indicators and push-buttons of the annunciator unit SACO 64D4.
Standardized
operational sequences
The annunciator unit is supplied with five
standardized field-selectable operational sequence
alternatives of which the most adequate one for
a certain application is selected for each annun-
ciator module. The operational sequences are:
0 = ISA A, automatic reset
1 = ISA A-1, automatic reset, separate reset of
audible alarm
2 = ISA M-1, manual reset, separate reset of au-
dible alarm
3 = ISA R-1, manual reset, separate reset of au-
dible alarm, visual ringback on return
4 = DIN 19235, manual reset after return to
normal if acknowledged while alert, visual
ringback on return if acknowledged before
return to normal
Parameter S17
The above operational sequences are common
to all the 16 channels in the module. However
the sequences can be altered on a per-channel
basis according to the following:
0 = indications according to the selected se-
quence
1 = indications according to the selected se-
quence but including audible alarm also on
return. Valid only for sequences ISA R-1 and
DIN 19235
2 = field contact following indication without
audible alarm
Parameter S4
The acknowledge/reset operations required are
determined by the annunciator unit itself. The
annunciator unit is provided with two external
control inputs, one for remote resetting of the
audible device and an other for remote acknowl-
edge/reset of the alarm channels.
NOTE!
There is also a Test pusch-button in the module
SWDM 3A1. The test is accomplished by press-
ing the test button continually for approximately
1 second which causes all LED indicators to
light up. The visual displays can not be tested if
an alarm channel is unacknowledged or not re-
set. Pressing the test button for approximately
15 s activates the self-supervision auxiliary out-
put relay and the FAULT LED.
