Nexus A1557 - Page 5

Document Ref: Nex8inst.doc/Rev0 09.07.00 Page 5 of 30 Originator MC Checked by AC__
A1557 Field Terminal List [Listed along the top edge of the PCB from left to right]
Terminal Ident. Function Terminal Ident. Function
Aux Fire NO 1 Fire relay normally open 1 Alarm 1 + Sounder circuit 1 + [Active polarity]
NC1 Fire relay normally closed 1 - Sounder circuit 1 - [Active polarity]
P1 Fire relay pole 1 Alarm 2 + Sounder circuit 2 + [Active polarity]
NO 2 Fire relay normally open 2 - Sounder circuit 2 - [Active polarity]
NC2 Fire relay normally closed 2 Network NO + Panel network out +
P2 Fire relay pole 2 NO- Panel network out -
Aux Flt P Fault relay pole NI + Panel network in +
NO Fault relay normally open NI - Panel network in -
NC Fault relay normally closed Loop 1 LO+ Loop 1 out +
Aux 24V Aux DC supply [24V] LO- Loop 1 out -
0V Aux DC supply [0V] LI+ Loop 1 in +
I/O MX+ Local I/O expansion port + LI- Loop 1 in -
MX- Local I/O expansion port - Loop 2 LO+ Loop 2 out +
Repeater RO + Repeater out + LO- Loop 2 out -
RO - Repeater out - LI+ Loop 2 in +
RI + Repeater in + LI- Loop 2 in -
RO - Repeater in -
Remote
Inputs
SAL Silence alarms
RST Reset
EVC Evacuate
SBZ Silence buzzer
COV Class change alarm
FLT Fault
1.1.6 Power Supply Illustration
12V
+
12V
+