LN1000 IS Annunciator
47
Common outputs
Two additional outputs are available from the Sequence Card designated B1 and B2. Both
these outputs can be connected to the safe area using IS Relays as shown in Figure 13.4
B1 output
The B1 output is either active if any channel is in alarm or alternatively active if any field
contact in Field Contact Group is abnormal.
The operational mode is user selectable by DIL switch.
The output is active low or active high, again selectable by DIL switch.
B2 output
The B2 output pulses for 1 second with each new alarm.
Connections from common outputs using safe
area mounted IS relays (Figure 13.3)
12
11
10
9
8
7
6
5
4
3
2
1
HAZARDOUS AREA
SAFE AREA
IS RELAY
2
DAA
149
IS RELAY
DAA
149
-
+
B1 OUTPUT
1
2
1
4
3
4
3
B2 OUTPUT
-
+
LN1000/SC
SEQUENCE CARD
