Nexus 21 A1557 Loop Card Expansion Motherboard, Programmable Expansion Boards

1.1.7Loop Card Expansion Motherboard

l

l

l

l

l

l

l

l

l

l

l

l

l

l

l

l

l

l

l

l

l

l

l

l

o

o

i

i

o

o

i

i

o

o

i

i

o

o

i

i

o

o

i

i

o

o

i

i

+

-

+

-

+

-

+

-

+

-

+

-

+

-

+

-

+

-

+

-

+

-

+

-

Loop 3

Loop 4

Loop 5

Loop6

Loop 7

Loop 8

A1557 motherboard connector

Loop 3 card slot

Loop 4 card slot

Loop 5 card slot

Loop 6 card slot

Loop 7 card slot

Loop 8 card slot

0V

5V

24V

1.1.8Programmable Expansion Boards

Up to 31 A1535 (relay) and A1536 (alarm) programmable expansion boards may be connected to the Nexus 1-8 loop (A1557) panel. Two boards may be housed internally, the remainder require other enclosures. Refer to the A1535/A1536 Installation & Commissioning Manuals for further details.

(i)A1535 8 Way Programmable Input/Output Relay Board

The A1535 board provides 8 programmable inputs and 8 programmable relay circuit outputs.

(ii)A1536 8 Way Programmable Input/Output Alarm Board

The A1536 board provides 8 programmable inputs (0V switched) and 8 programmable alarm circuit outputs.

Document Ref: Nex8inst.doc/Rev0 09.07.00 Page 6 of 30 Originator MC Checked by AC__