5110 Relay Logic Modules

5110 Relay Logic Modules

• Plug-in module with four internal dry
  contact relays
• Coin-gold contacts to permit use in low
  current circuits and harsh
  environments without contamination
• Installer programmable to perform
  required complex logic functions
• Latching/non-latching operation and
  reset condition individually
  programmable for each relay
• DPDT contacts 2A @ 30 VDC, 1A @ 120
  VAC (UL rating)
• Drive capability for external relays

THE MODULE

The SST Model 5110 Relay Logic Module
can be used when dry relay contacts are
required to perform various logic functions.
The dry contacts may be used to communicate
with and/or drive external equipment,
such as annunciators, SCADA data acquisition
systems, or host computers. The contacts
can also be used to perform various logic
functions within the NOVA-5000 Detection
& Control System.

Each Relay Module is equipped with four
two-pole relays. Three of the relays can be
used for external signalling, i.e. their contacts
are accessible through terminals on the
backplane and may be individually programmed
to be either normally open (NO) or
normally closed (NC) via ‘suitcase jumpers’.
The fourth relay is programmable for internal
logic.

Gold-plated labeled pin headers on the
printed circuit board provide access to each
of the eight backplane bus signals, the four
external inputs (connected to terminals on the
backplane), the relay control inputs (i.e.
latching, non-latching or reset input) and the
relay contacts. The module is prewired to the
most common configuration. Patch cords
with gold-plated connectors matching the pin
headers are available for connecting other
logic configurations. The backplane bus
signals and the external inputs are diode
isolated and can be freely connected to
achieve “or” gate logic combinations.
Various “OR’, “AND” and more complex
gate logic functions can be achieved by freely
combining relay contacts and inputs with the
patch cords. Additionally, any combination of
signals may be fed back into the NOVA-5000
backplane. Both fault and isolate loops may be
controlled by the relay contacts, if necessary.

The relay contacts are formed from coin
quality gold material, so that they are suitable
for even the smallest “microamp” current. The
gold also prevents any tarnishing of the
contacts in corrosive environments.

Six Light Emitting Diode (LED) indicators
are provided on the front of the module.
During normal operation, the green Power
LED will be the only visible indication on the
module. This indicates that 24 volt DC power
is being supplied to the module from the
redundant system power supplies. Just below
this green LED is a companion yellow LED
which is normally invisible. Should either of
the system power supplies fail, the yellow LED
will be visible to indicate a power fault to this
module. One green LED is provided for each
of the relays as a status display. When any
relay is activated the associated LED will be
lit. Pressing the Reset switch on the front panel
unconditionally causes all four relays to reset.

Each Model 5110 Relay Logic Module
mounts in one plug-in space in the NOVA-
5000 System Rack Assembly. Although not
required for normal programming or operation
of the module, a Module Test Extender Card
can be helpful to troubleshoot logic problems
during system design and start-up.

Architect’s and Engineer’s Specifications

Technical Specifications and Ordering Information

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